Technical Committee on Electrical Equipment in …...Technical Committee on Electrical Equipment in...

Technical Committee on Electrical Equipment in

Chemical Atmospheres

TO: Technical Committee on Electrical Equipment in Chemical Atmospheres FROM: Eric Nette, Staff Liaison/Engineer DATE: August 1, 2014 SUBJECT: Agenda Package – NFPA 496, NFPA 497, and NFPA 499 (A2016) First Draft

Meeting – September 16-18, 2014

Enclosed is the agenda package for the September 16-18, 2014 meeting for the NFPA 496, NFPA 497, and NFPA 499 First Draft Meeting. Please ensure that you have reviewed the public input and the other agenda items in advance to prepare for discussion. The agenda and public input will be also be posted to the document information pages: www.nfpa.org/496next, www.nfpa.org/497next, and www.nfpa.org/499next. Some items to have available during the meeting include:

Agenda package with public input

A copy of NFPA 496, NFPA 497, and NFPA 499 (visit the NFPA 496, NFPA 497, NFPA 499 Document information pages for your free committee copy)

Any previous copies of the technical committees standards

A laptop

Optional items that are sometimes useful include:

Review of NFPA’s Process, www.nfpa.org/regs If you have any questions or comments, please feel free to reach me at (617) 984-7434 or by e-mail at [email protected] . I look forward to our meeting to begin the revision cycle!

http://www.nfpa.org/496next



http://www.nfpa.org/regs

mailto:[email protected]

Technical Committee on Electrical Equipment in Chemical Atmospheres

AGENDA

NFPA 496, 497, and 499 A2016 First Draft Meeting September 16-18, 2014

Hotel Ithaca Downtown

Ithaca, NY 14850

8:00 a.m. to 5:00 p.m. (Eastern Time Zone) http://nfpa.adobeconnect.com/eec/

1. Meeting opening, introduction and attendance

2. Approval of NFPA 497/499 ROC Minutes of March, 2011 and NFPA 496 ROC Minutes of March, 2012 (Attachment A. 497/499 and 496 Meeting Minutes).

3. Chair's remarks, William Fisk

4. Staff Liaison update:

a. A2016 Schedule (Attachment B. A2016 Revision Cycle)

b. Committee Membership Update (Attachment C. EEC-AAA Membership)

c. Standards Process Review (Attachment D. NFPA Process – Quick Reference Guide)

5. New Business

a. Presentation on developments from NFPA 2 and NFPA 55 by Mr. Rob Early, Chair of NFPA 55

b. Public Input for NFPA 497 (Attachment E., NFPA 497 - A2016 Public Input) and development

of First Revisions

c. Public Input for NFPA 496 (Attachment F. NFPA 496 – A2016 Public Input) and development

of First Revisions

d. Public Input for NFPA 499 (Attachment G. NFPA 499 – A2016 Public Input) and development

of First Revisions

6. Other business

7. Date/Location of Next Meeting. (Second Draft Meeting between July 1, 2015 and October 30, 2015)

8. Adjournment

Attachments:

A. 497/499 Meeting Minutes and 496 Meeting Minutes

B. A2016 – Revision Cycle

C. EEC-AAA Committee Membership

D. NFPA Process – Quick Reference Guide

E. NFPA 497 - A2016 Public Input

F. NFPA 496 – A2016 Public Input

G. NFPA 499 – A2016 Public Input

http://nfpa.adobeconnect.com/eec/

Attachment A

497/499 ROC Meeting Minutes, March, 2011

496 ROC Meeting Minutes, March, 2012

Technical Committee on Electrical Equipment

in Chemical Atmospheres

1

ROC Minutes for NFPA 497 & 499

Intertek Testing Services

Plano, TX

March 22 – 24, 2011

I. Attendance: Principal Members:

James Stallcup, Sr. – Grayboy, Inc., TX – Chair

Donald Ankele, Underwriters Laboratories Inc., IL

Babanna Biradar – Bechtel Corporation, TX (On Conference call/Live Meeting)

Frank C. DeFelice, Jr. – Cytec Industries, Inc., CT

Matt Egloff – Montana Tech, Univ. of Montana, MT (On Conference call/Live Meeting)

William T. Fiske – Intertek Testing Services, NY

William G. Lawrence, Jr. – FM Global, MA

Timothy J. Myers – Exponent, Inc., MA (On Conference call/Live Meeting)

Ryan Parks – Alt., Intertek Testing Services, TX

Sam Rodgers – Alt., Honeywell Inc., VA

Sonny Sengupta – FMC Corporation, NJ (On Conference call/Live Meeting)

James Stallcup, Jr. – Alt., Grayboy, Inc., TX

Erdem A. Ural – Loss Prevention Science & Technologies, Inc., MA (On Conference

call/Live Meeting)

David B. Wechsler – The Dow Chemical Company, TX – Rep. American Chemistry

Council

Jack H. Zewe – Electrical Consultants Inc., LA (On Conference call/Live Meeting)

Members without Alternates Present:

Mark Driscoll – XL Global Asset Protection Services, MA

Robert Malanga – Fire and Risk Engineering, NJ

Joseph V. Saverino – Air Products & Chemicals, Inc., PA

Rodolfo N. Sierra – U.S. Coast Guard, DC

NFPA Staff: Martha H. Curtis – NFPA Staff Liaison, MA

II. Minutes of Meeting:

1. Call to order. The Chair called the meeting to order at 9:20 AM on March 22, 2011.

2. Introduction. Self-Introduction of Committee Members and Guests

3. Chair and Staff Liaison Remarks: The Chair welcomed all attendees, including those participating on the

Conference call with Live Meeting (once the Live Meeting portion of the meeting was operational). The

Chair had no remarks other than to note the purpose for the meeting – to prepare the ROC for both NFPA 497

and 499.

4. Technical Committee Update: The Committee was shown a PowerPoint Presentation containing the

essential dates for F2011 cycle and specific information related to the processing of the Public Comment

actions for the Report on Comments (ROC). A total of 8 Public Comments were submitted to NFPA 497 and

a total of 16 Public Comments were submitted to NFPA 499.



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5. Approval of Minutes from previous meeting. The minutes from the NFPA 497 and 499 ROP meeting

held August 24 – 26, 2010 in Norwood, MA have not been finalized so are not available to be approved at

this meeting. They will be provided for the Committee’s review and approval at a later date.

6. Review of F2011 Revision Cycle. The schedule for NFPA 497 and 499 is Fall 2011 and the key

milestones are shown in the attached schedule.

7. Committee Correspondence. No action was taken on this agenda item.

8. Act on Public Comments to NFPA 497. The Committee completed action on 8 Public Comments and no

Committee Comments were developed or approved for NFPA 497. The Committee’s action on these

comments will be finalized in their letter ballot submitted separately.

9. Act on Public Comments to NFPA 499. The Committee completed action on 16 Public Comments and

approved 1 Committee Comment for NFPA 499. The Committee’s action on these comments will be

finalized in their letter ballot submitted separately.

10. Old Business. No action was taken on this agenda item.

11. New Business. The Committee reviewed draft proposals developed for NFPA 496 by the task group.

Bill Fiske led the task group and discussed the proposals intended to be submitted for the next revision of

NFPA 496 (F2012 revision cycle also shown as an attachment to the minutes). The Proposal Closing Date for

the F2012 cycle is May 23, 2011. The Committee also discussed date and location for its next meeting, which

is the ROP meeting for NFPA 496. The Committee proposed meeting August 23 – 24, 2011 in Baltimore,

MD. Staff will submit a request for the meeting and notify the Committee once details for the hotel have

been finalized.

12. Adjournment. The meeting adjourned at 11:45 AM on March 24, 2011.

Respectfully submitted,

Guy R. Colonna (on behalf of Martha Curtis)

Staff Liaison to the TC on Electrical Equipment in Chemical Atmospheres

NFPA 497/499 Revision Cycle: Fall 2011 (2012 edition)

4 year cycle

(Previous revision cycles: F2007; A2004; and A1997)

Proposal Closing Date: May 28, 2010

NFPA 497/499 ROP Mtg. (Norwood, MA): Before Aug. 27, 2010

(August 24 – 26, 2010)

ROPs published and posted: Dec. 22, 2010

Comment Closing Date: March 4, 2011

NFPA 497/499ROC Mtg. (Plano, TX): Before May 6, 2011

(March 22 – 24, 2011)

ROCs published and posted: August 26, 2011



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Notice of Intent to Make Motion closing: Oct. 21, 2011

Standards Council Issuance of Consent Docs: Dec. 13, 2011

NFPA Assn. Meeting (Docs w/NITMAMs): June 11 – 14, 2012 (Location: Las Vegas, NV)

Issuance of new std. (Docs w/NITMAMs): August 9, 2012

NFPA 496 Revision Cycle: Fall 2012 (2013 edition)

5 year cycle


Proposal Closing Date: May 23, 2011

NFPA 496 ROP Mtg. (Baltimore, MD): Before Aug. 26, 2011

(August 23 – 24, 2011)

ROPs published and posted: Dec. 23, 2011

Comment Closing Date: March 3, 2012

NFPA 496 ROC Mtg. (Location TBD): Before May 4, 2012

ROCs published and posted: August 24, 2012

Notice of Intent to Make Motion closing: Oct. 5, 2012

Standards Council Issuance of Consent Docs: Nov. 27, 2012

NFPA Assn. Meeting (Docs w/NITMAMs): June 10 – 13, 2013 (Location: Chicago, IL)

Issuance of new std. (Docs w/NITMAMs): August 1, 2013


1

ROC Minutes for NFPA 496

Hilton Lincoln Center Dallas, TX

March 19, 2012

I. Attendance: Principal Members: James Stallcup, Sr. – Grayboy, Inc., TX – Chair Jonathan Cadd – International Association of Electrical Inspectors, TX (On Web Teleconference w/Live Meeting) John Cawthon – State of Alaska, Div. of Fire & Life Safety, AK (On Web Teleconference Meeting) William T. Fiske – Intertek Testing Services, NY (On Web Teleconference Meeting) William G. Lawrence, Jr. – FM Global, MA (On Web Teleconference Meeting) Ryan Parks – Alt., Intertek Testing Services, TX (On Web Teleconference) Sonny Sengupta – FMC Corporation, NJ (On Web Teleconference Meeting) James Stallcup, Jr. – Alt., Grayboy, Inc., TX David B. Wechsler – The Dow Chemical Company, TX – Rep. American Chemistry Council (On Web Teleconference Meeting)

Members without Alternates Present:

Babanna Biradar – Bechtel Corporation, TX Edward Briesch – Underwriters Laboratories Inc., IL Frank C. DeFelice, Jr. – Cytec Industries, Inc., CT Mark Driscoll – XL Global Asset Protection Services, MA Matt Egloff – Montana Tech, Univ. of Montana, MT Robert Malanga – Fire and Risk Engineering, NJ Timothy J. Myers – Exponent, Inc., MA Sam Rodgers – Voting Alt., Honeywell Inc., VA Joseph V. Saverino – Air Products & Chemicals, Inc., PA Rodolfo N. Sierra – U.S. Coast Guard, DC Erdem A. Ural – Loss Prevention Science & Technologies, Inc., MA Jack H. Zewe – Electrical Consultants Inc., LA

NFPA Staff: Martha H. Curtis – NFPA Staff Liaison, MA II. Minutes of Meeting: 1. Call to order. The Chair called the meeting to order at 10:15 AM CDST on March 19, 2012. 2. Introduction. The Chair asked all participants for a Self-Introduction of Committee Members and Guests. 3. Chair and Staff Liaison Remarks: The Chair welcomed all attendees, including those participating on the Teleconference with Live Meeting. The Chair had no remarks other than to note the purpose for the meeting – to prepare the ROC for NFPA 496. 4. Technical Committee Update: Staff reported to the Committee that two appointments (Jonathan Cadd, IAEI, Principal; and Jack Jamison, Miller Engineering, Inc., Alternate) were made by the Standards Council during their recent March 5-6, 2012 meeting.


2

The Committee is still out of balance with respect to the Special Expert category, with 7 Voting Principal members out of 19 total members. The Committee was encouraged to find additional applicants in categories other than SE in order to restore the balance to the Committee. Principals were also reminded to identify an Alternate if they did not have one. As part of the NFPA Staff Liaison report, the Committee was reminded about the essential dates for F2012 cycle and specific information related to the processing of the Public Comment actions for the NFPA 496 Report on Comments (ROC). A total of 1 Public Comment was submitted to NFPA 496. In addition to the review of the ROC processing, the Committee was reminded about information that can be found on the Document Information Pages on the NFPA website. The Committee was provided with an update on the changes coming to the NFPA codes and standards development process. The new process will be implemented for those documents reporting to the F2013 revision cycle and beyond, so the Committee will have some time to monitor the new process before the next revision cycles for NFPA 497, 499 and 496.

5. Approval of Minutes from Previous Meeting. The minutes from the NFPA 496 ROP meeting held August 23, 2011 in Baltimore, MD at the Holiday Inn - Inner Harbor were approved as submitted.

6. Review of F2011, A2012, and F2012 Revision Cycles. NFPA 497 was completed in Fall 2011 and was published as a 2012 document. NFPA 499 was moved to the A2012 revision cycle and it will be released as a 2013 document, since it received a NITMAM. The key milestones are shown in the attached schedule. With the completion of the ROC for NFPA 496, the next milestone is October 5th, 2012 which is the NITMAM deadline for this revision cycle. The schedule for F2012 is attached for reference and was discussed to highlight key milestones related to development of the 2013 edition of NFPA 496.

7. Act on Public Comments to NFPA 496. The Committee completed action on 1 Public Comment for NFPA 496. The Committee’s action on this comment will be finalized in their letter ballot submitted separately. The Committee approved a motion directing staff to prepare the NFPA 496 ROC letter ballot.

8. Committee Correspondence. No action was taken on this agenda item.

9. Old Business. No action was taken on this agenda item.

10. New Business. The Committee was informed that the NITMAM on NFPA 499 will be discussed at the 2012 NFPA C&E Technical Reports Session on June 13th (starting at 2 PM to the close of business). The Committee was informed that the Motions Committee Report contains the NFPA 499 NITMAM and it will be posted on May 4th, 2012. The Staff identified that four TC members were tentatively planning on attending the NFPA C&E Technical Reports Session. There are no meetings scheduled going forward, since all the documents have been brought up-to-date. If any future meetings are needed, the details will be sent separately at a later date. Jonathan Cadd offered the Committee the opportunity to meet at the IAEI Office in Richardson, TX at a later date.

11. Adjournment. The meeting adjourned at 11:20 AM CDST on March 19, 2012. The Committee completed its business so the meeting was adjourned.

Respectfully submitted,

Martha H. Curtis

Staff Liaison to the TC on Electrical Equipment in Chemical Atmospheres


3

/NFPA 497/499 Revision Cycle: Fall 2011 (2012 edition)

4 year cycle (Previous revision cycles: F2007; A2004; and A1997)

Proposal Closing Date: May 28, 2010 NFPA 497/499 ROP Mtg. (Norwood, MA): Before Aug. 27, 2010 (August 24 – 26, 2010) ROPs published and posted: Dec. 22, 2010 Comment Closing Date: March 4, 2011 NFPA 497/499 ROC Mtg. (Plano, TX): Before May 6, 2011 (March 22 – 24, 2011) ROCs published and posted: August 26, 2011 Notice of Intent to Make Motion closing: Oct. 21, 2011 Standards Council Issuance of NFPA 497 Consent Doc: Dec. 13, 2011 NFPA Assn. Meeting (Docs w/NITMAMs): June 11 – 14, 2012 (Location: Las Vegas, NV) Issuance of NFPA 499 (Docs w/NITMAMs): August 9, 2012 Publication Date of NFPA 499: 2013 edition

NFPA 496 Revision Cycle: Fall 2012 (2013 edition) 5 year cycle


Proposal Closing Date: May 23, 2011 NFPA 496 ROP Mtg. (Baltimore, MD): Before Aug. 26, 2011 (August 23 – 24, 2011) ROPs published and posted: Dec. 23, 2011 Comment Closing Date: March 2, 2012 NFPA 496 ROC Mtg. (March 19, Web mtg.): Before May 4, 2012 ROCs published and posted: August 24, 2012 Notice of Intent to Make Motion closing: Oct. 5, 2012 Standards Council Issuance of Consent Docs: Nov. 27, 2012 NFPA Assn. Meeting (Docs w/NITMAMs): June 10 – 13, 2013 (Location: Chicago, IL) Issuance of new doc. (Docs w/NITMAMs): August 1, 2013

Attachment B

A2016 Revision Cycle

2016 ANNUAL REVISION CYCLE *Public Input Dates may vary according to standards and schedules for Revision Cycles may change. Please check the NFPA Website for the most up‐to‐date information on Public Input Closing Dates and schedules at

www.nfpa.org/document # (i.e. www.nfpa.org/101) and click on the Next Edition tab.

Process Stage

Process Step

Dates for TC

Dates forTC with

CC Public Input Closing Date for Paper Submittal* 6/6/2014 6/6/2014

Public Input Closing Date for Online Submittal (e‐PI)* 7/7/2014 7/7/2014

Final Date for TC First Draft Meeting 12/12/2014 9/12/2014

Public Input Posting of First Draft and TC Ballot 1/30/2015 10/24/2014

Stage Final date for Receipt of TC First Draft ballot 2/20/2015 11/14/2014

(First Draft) Final date for Receipt of TC First Draft ballot ‐ recirc 2/27/2015 11/21/2014

Posting of First Draft for CC Meeting 11/28/2014

Final date for CC First Draft Meeting 1/9/2015

Posting of First Draft and CC Ballot 1/30/2015

Final date for Receipt of CC First Draft ballot 2/20/2015

Final date for Receipt of CC First Draft ballot ‐ recirc 2/27/2015

Post First Draft Report for Public Comment 3/6/2015 3/6/2015

Public Comment Closing Date for Paper Submittal* 4/10/2015 4/10/2015

Public Comment Closing Date for Online Submittal (e‐PC)* 5/15/2015 5/15/2015

Final Date to Publish Notice of Consent Standards (Standards that received no Comments)

5/29/2015 5/29/2015

Appeal Closing Date for Consent Standards (Standards that received no Comments)

6/12/2015 6/12/2015

Final date for TC Second Draft Meeting 10/30/2015 7/24/2015

Comment Posting of Second Draft and TC Ballot 12/11/2015 9/4/2015

Stage Final date for Receipt of TC Second Draft ballot 1/4/2016 9/25/2015

(Second Final date for receipt of TC Second Draft ballot ‐ recirc 1/11/2016 10/2/2015

Draft) Posting of Second Draft for CC Meeting 10/9/2015

Final date for CC Second Draft Meeting 11/20/2015

Posting of Second Draft for CC Ballot 12/11/2015

Final date for Receipt of CC Second Draft ballot 1/4/2016

Final date for Receipt of CC Second Draft ballot ‐ recirc 1/11/2016

Post Second Draft Report for NITMAM Review 1/18/2016 1/18/2016

Tech Session Notice of Intent to Make a Motion (NITMAM) Closing Date 2/19/2016 2/19/2016

Preparation Posting of Certified Amending Motions (CAMs) and Consent Standards

4/15/2016 4/15/2016

(& Issuance) Appeal Closing Date for Consent Standards 5/3/2016 5/3/2016

SC Issuance Date for Consent Standards 5/13/2016 5/13/2016

Tech Session Association Meeting for Standards with CAMs 6/6‐9/2016 6/6‐9/2016

Appeals and Appeal Closing Date for Standards with CAMs 6/29/2016 6/29/2016

Issuance SC Issuance Date for Standards with CAMs 8/4/2016 8/4/2016

Approved:__October 30, 2012 Revised___March 7, 2013_____________________

NFPA 496, NFPA 497, NFPA 499 Revision Cycle KEY DATES Annual 2016

NFPA 496, NFPA 497, NFPA 499 A2016 [EEC-AAA]

Important Dates For the Cycle:

Public Input Closing (Paper) June 6, 2014 (DONE)

Public Input Closing (Digital) July 7, 2014 (DONE)

Posting of First Draft January 30, 2015

Public Comment Closing (Paper) April 10, 2015

Public Comment Closing (Digital) May 15, 2015

Posting of Second Draft December 11, 2015

Notice of Intent to Make Motion (NITMAM) February 19, 2016

Issuance of Consent Standard May 13, 2016 (published bit later)

NFPA Annual Meeting with CAMs June 6-9, 2016

Issuance of Standard – with CAMs August 4, 2016 (published bit later)

Attachment C

EEC-AAA Committee Membership

Address List No PhoneElectrical Equipment in Chemical Atmospheres EEC-AAA

Eric Nette06/20/2014

EEC-AAAWilliam T. FiskeChairIntertek Testing Services3933 US Route 11 SouthCortland, NY 13045-9715Alternate: Ryan Parks

RT 10/1/1994EEC-AAA

Donald W. AnkelePrincipalUL LLC333 Pfingsten RoadNorthbrook, IL 60062-2096Alternate: Paul T. Kelly

RT 1/14/2005

EEC-AAABabanna BiradarPrincipalBechtel Corporation3000 Post Oak BoulevardHouston, TX 77056Alternate: Antonino Nicotra

SE 3/2/2010EEC-AAA

Ronald M. BrownPrincipalPPG Industries, Inc.151 Colfax StreetSprongdale, PA 15144

U 03/07/2013

EEC-AAAJonathan L. CaddPrincipalElectrical Systems and Instrumentation, Inc.1702 Ward StreetMidland, TX 79705

M 3/5/2012EEC-AAA

John H. CawthonPrincipalState of Alaska Division of Fire & Life Safety411 West 4th Street, Suite 2BAnchorage, AK 99501

E 8/9/2011

EEC-AAAPaul ChantlerPrincipalSherwin Williams333 Republic101 Prospect AvenueCleveland, OH 44023Alternate: Mary Lammermeier

U 03/07/2013EEC-AAA

Chris CirelliPrincipalWaters Corporation177 Robert Treat Paine DriveTaunton, MA 02780

M 07/29/2013

EEC-AAAFrank C. DeFelice, Jr.PrincipalAllnex, Inc.528 South Cherry StreetWallingford, CT 06492

U 8/5/2009EEC-AAA

Matt EgloffPrincipalMontana Tech, University of MontanaGeneral Engineering Department1300 West Park StreetButte, MT 59701

SE 1/10/2008

EEC-AAAFelix J. GarfunkelPrincipalParsons Corporation100 High StreetBoston, MA 02110-1713

SE 07/29/2013EEC-AAA

Stephan LarmannPrincipalSchischek Inc.4460 Brookfield Corporate Drive, Suite BChantilly, VA 20151

M 08/09/2012

EEC-AAAWilliam G. Lawrence, Jr.PrincipalFM Global1151 Boston-Providence TurnpikePO Box 9102Norwood, MA 02062-9102Alternate: Marlon B. Mitchell

I 1/1/1990EEC-AAA

Robert MalangaPrincipalFire and Risk Engineering9 Flintlock Drive, Suite 100Long Valley, NJ 07853

SE 4/17/1998

1



EEC-AAAAdam MorrisonPrincipalFike Corporation704 SW 10th StreetBlue Springs, MO 64015-4263

M 03/03/2014EEC-AAA

Timothy J. MyersPrincipalExponent, Inc.9 Strathmore RoadNatick, MA 01760-2418

SE 7/26/2007

EEC-AAASamuel A. RodgersPrincipalHoneywell, Inc.15801 Woods Edge RoadColonial Heights, VA 23834-6059

U 4/1/1996EEC-AAA

Joseph V. SaverinoPrincipalAir Products and Chemicals, Inc.7201 Hamilton BoulevardAllentown, PA 18195-1501

U 10/1/1994

EEC-AAARodolfo N. SierraPrincipalUS Coast GuardDesign & Engineering StandardsSystems Engineering Division (CG 5213)2100 2nd Street, SWWashington, DC 20593

E 3/4/2009EEC-AAA

James G. StallcupPrincipalGrayboy, Inc.6800 Meadow CreekNorth Richland Hills, TX 76182Alternate: James W. Stallcup, Jr.

SE 1/1/1991

EEC-AAAErdem A. UralPrincipalLoss Prevention Science & Technologies, Inc.2 Canton Street, Suite A2Stoughton, MA 02072

SE 8/5/2009EEC-AAA

David B. WechslerPrincipal27706 Dalton Bluff CourtKaty, TX 77494American Chemistry Council

U 1/1/1987

EEC-AAAJack H. ZewePrincipalElectrical Consultants Inc.3221 Illinois AvenueKenner, LA 70065-4530

SE 1/1/1992EEC-AAA

Jack E. Jamison, Jr.Voting AlternateMiller Engineering, Inc.991 River RoadMorgantown, WV 26501International Association of Electrical InspectorsVoting Alt. to IAEI Rep.

E 03/05/2012

EEC-AAAPaul T. KellyAlternateUnderwriters Laboratories Inc.333 Pfingsten RoadNorthbrook, IL 60062-2096Principal: Donald W. Ankele

RT 03/03/2014EEC-AAA

Mary LammermeierAlternateSherwin-Williams101 West Prospect AvenueCleveland, OH 44115Principal: Paul Chantler

U 07/29/2013

EEC-AAAMarlon B. MitchellAlternateFM Global743 Reynolds RoadWest Glocester, RI 02814Principal: William G. Lawrence, Jr.

I 10/18/2011EEC-AAA

Antonino NicotraAlternateBechtel Oil Gas & Chemicals3000 Post Oak BoulevardHouston, TX 77056Principal: Babanna Biradar

SE 10/29/2012

2



EEC-AAARyan ParksAlternateIntertek Testing Services1809 10th Street, Suite 400Plano, TX 75074-8009Principal: William T. Fiske

RT 8/5/2009EEC-AAA

James W. Stallcup, Jr.AlternateGrayboy, Inc.6800 Meadow CreekNorth Richland Hills, TX 76182Principal: James G. Stallcup

SE 1/1/1994

EEC-AAAEric NetteStaff LiaisonNational Fire Protection Association1 Batterymarch ParkQuincy, MA 02169-7471

04/16/2014

3

Attachment D

NFPA Process – Quick Reference Guide

New Process – Quick Reference Guide For additional information on the Regulations visit: www.nfpa.org/Regs

There are only three actions a TC can take at the First Draft (ROP)

meeting: 1. Resolve a Public Input (no change to the document) 2. Create a First Revision (change to the document) 3. Create Committee Input

Resolve Public Input (no change to the document)

TC must provide a response (Committee Statement/CS) to ALL Public Input (proposal).

CS for not doing what is suggested

Sample Motion: “I make a motion to resolve PI#_ with the following committee statement__.” Approval by meeting vote (simple majority). Not subject to Ballot.

Create a First Revision (change to the document)

TC must create a First Revision (FR) for each change they wish to make to the document, either using Public Input for the basis of the change or not using a Public Input for the basis. One or more Public Input can be considered for the FR.

All Public Input requires a response

TC can use a Public Input for basis i. Sample Motion: “I make a motion to revise section __ using PI#_ as the

basis for change.” Approval by meeting vote (simple majority) and final approval through ballot.

TC develops revision without a Public Input for basis i. Sample Motion: “I make a motion to revise section __ as follows___.”

Approval by meeting vote (simple majority) and final approval through ballot.

First Revisions require a committee statement

Committee Input

TC may create a Committee Input (CI). This replaces the old system “rejected” Committee Proposals. CIs will get printed in the report but will not be balloted or shown as a change in the draft. CIs are used to solicit public comments and/or as a placeholder for the comment stage.

i. Sample Motion: “I make a motion to create a CI with a proposed revision to section__ as follows___.” Approval by meeting vote (simple majority). Not subject to ballot.

Requires a committee statement to explain the intent of making a CI.

http://www.nfpa.org/Regs

Comparison to Previous Process:

PREVIOUS ACTIONS NEW PROCESS ACTIONS Sample Motion

Accept or any variation of Accept

(APA, APR, APP) on a public

proposal

1) Committee generates a First

Revision and Substantiation (CS)

for change

2) Committee provides response (CS)

to each PI that is associated with the

revision

1) “I make a motion to revise section __ using PI#_ as the basis for change.”

2) “ I make a motion to resolve PIs#_ through ## with the following statement__”

Rejected Public Proposal Committee provides response (CS)

to PI

“I make a motion to resolve

PI#_ with the following

committee statement__.”

Accepted Committee Proposal Committee generates a First Revision

and Substantiation (CS) for change

“I make a motion to revise

section __ as follows___.”

Committee generates a

statement for reason for change.

Rejected Committee Proposal Committee generates a Committee

Input (CI) and reason (CS) for

proposed change

“I make a motion to create a CI

with a proposed revision to

section__ as follows___.”

Committee generates a

statement for reason for CI.

Notes:

1) All meeting actions require a favorable vote of a simple majority of the members present. 2) All First Revisions will be contained in the ballot and will require a 2/3 affirmative vote to

confirm the meeting action. 3) Only the First Revisions will be balloted. PIs and CIs will be contained in the report but will

not be balloted. 4) Comments may be submitted on all PIs, FRs and CIs

Term Comparison between New and Old:

NEW TERM OLD TERM

Input Stage ROP Stage

Public Input (PI) Proposal

First Draft Meeting ROP Meeting

Committee Input Committee Proposal that Fail

Ballot

Committee Statement

(CS) Committee Statement

First Revision (FR) Committee Proposal or Accepted

Public Proposal

First Draft Report ROP

First Draft ROP Draft

Comment Stage ROC Stage

Public Comment Public Comment

Second Draft Meeting ROC Meeting

Committee Comment Committee Comment that Fail

Ballot

Committee Action Committee Action

Second Revision Committee Comment or Accepted

Public Comment

Second Draft Report ROC

Second Draft ROC Draft

Note: The highlighted terms are the ones that will be most applicable at the First Draft Meeting.

Attachment E

NFPA 497

A2016 Public Input

Public Input No. 12-NFPA 497-2014 [ Chapter 2 ]

Chapter 2 Referenced Publications

2.1 General.

The documents or portions thereof listed in this chapter are referenced within this recommended practice and should beconsidered part of the recommendations of this document.

2.2 NFPA Publications.

National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.

NFPA 30, Flammable and Combustible Liquids Code, 2012 edition.

NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, 2011 edition .

NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, 2011 edition .

NFPA 35, Standard for the Manufacture of Organic Coatings, 2011 edition .

NFPA 36, Standard for Solvent Extraction Plants, 2009 edition 2013 .

NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals, 2011 edition .

NFPA 55, Compressed Gases and Cryogenic Fluids Code, 2010 edition 2013 .

NFPA 58, Liquefied Petroleum Gas Code, 2011 edition 2014 .

NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), 2009 edition 2013 .

NFPA 70® , National Electrical Code®, 2011 edition 2014 .

2.3 Other Publications.

2.3.1 ANSI Publications.

American National Standards Institute, Inc., 25 West 43rd Street, 4th Floor, New York, NY 10036.

ANSI/ISA-RP12.12.03, Recommended Practice for Portable Electronic Products Suitable for Use in Class I and II, Division 2,Class I, Zone 2 and Class III, Division 1 and 2 Hazardous (Classified) Locations , 2002.

2.3.2 API Publications.

American Petroleum Institute, 1220 L Street, NW, Washington, DC 20005-4070.

API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities

Classified as Class I, Division 1 and Division 2, 2002. (Reaffirmed, November 2002.) 3 rd edition, 2008 .

API RP 505, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum FacilitiesClassified as Class I, Zone 0, Zone 1, and Zone 2, 2002, reaffirmed 2013 .

2.3. 3 2 ASHRAE Publications.

American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle NE, Atlanta, GA30329-2305.

ASHRAE 15 , Safety Code for Mechanical Refrigeration , 2007 & 34 , Safety Standard for Refrigeration Systems ,2013 with 2014 errata .

2.3. 4 3 ASTM Publications.

ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.

ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method), 2008.

2.3. 5 4 CGA Publications.

Compressed Gas Association, 4221 Walney Road, 5th Floor, Chantilly, VA 20151-2923.

ANSI/ CGA G2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia, 1999.

National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara...

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2.3. 6 5 IEC Publications.

International Electrotechnical Commission, 3, rue de Varembé, P.O. Box 131, CH-1211 Geneva 20, Switzerland.

IEC TR3 60079-20, Electrical apparatus for explosive gas atmosphere—Part 20: Data for Flammable gaes and vapors,relating to the use of electrical apparatus , 1996.

2.

-1 , Explosive Atomspheres —Part 20 -1 : Material Characteristics for Gas and Vapor Classification - Test Methodsand Data , 2012 .

2.3.6 ISA Publications

The International Society of Automation, 67 T.W. Alexander Drive, P.O. Box 12277, Research Triangle Park, NC27709.

ISA-RP12.12.03, Standard for Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class IZone 2 and Class III, DIivision 1 and 2 Hazardous (Classified) Locations , 2011 .

2. 3.7 Other Publications.

Merriam-Webster’s Collegiate Dictionary, 11th edition, Merriam-Webster, Inc., Springfield, MA, 2003.

2.4 References for Extracts in Recommendations Sections.

NFPA 30, Flammable and Combustible Liquids Code, 2012 edition .



Statement of Problem and Substantiation for Public Input

Current editions referenced, updated titles of IEC and ISA standards, and eliminated the ANSI section due standard development by IEC.

Related Public Inputs for This Document

Related Input Relationship

Public Input No. 13-NFPA 497-2014 [Chapter C]

Submitter Information Verification

Submitter Full Name: Aaron Adamczyk

Organization: [ Not Specified ]

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Submittal Date: Thu Jun 12 12:34:37 EDT 2014


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Public Input No. 5-NFPA 497-2014 [ Section No. 2.3.3 ]

2.3.3 ASHRAE Publications.

American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle NE, Atlanta, GA30329-2305.

ASHRAE 15, Safety Code Standard for Mechanical Refrigeration Systems , 2007 2013 .

Additional Proposed Changes

File Name Description Approved

497_Ferguson_ASHRAE_PI5-7.pdf PI Form


There are outdated references to ASHRAE Standard 15. This proposes to update the reference title and year where it appears in this standard.


Submitter Full Name: STEVEN FERGUSON

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Submittal Date: Wed Jan 29 14:13:08 EST 2014


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NFPA Public Input Form

NOTE: All Public Input must be received by 5:00 pm EST/EDST on the published Public Input Closing Date.

For further information on the standards-making process, please contact the Codes and Standards Administration at 617-984-7249 or visit www.nfpa.org/codes.

For technical assistance, please call NFPA at 1-800-344-3555

FOR OFFICE USE ONLY

Log #:

Date Rec’d:

Date Name Steve Ferguson Tel. No. 678-539-1138

Company ASHRAE Email [email protected]

Street Address 2540 Drew Valley Rd City Atlanta State GA Zip 30319

Please indicate organization represented (if any) ASHRAE

1. (a) Title of NFPA Standard

NFPA® 497

Recommended Practice

for the Classification of

Flammable Liquids, Gases,

or Vapors and of

Hazardous (Classified)

Locations

for Electrical Installations

in Chemical Process Areas

NFPA No. & Year 497-2012

(b) Section/Paragraph 2.3.3, C2.2

2. Public Input Recommends (check one): new text revised text deleted text

3. Proposed Text of Public Input (include proposed new or revised wording, or identification of wording to be deleted): [Note: Proposed text should be in legislative format; i.e., use underscore to denote wording to be inserted (inserted wording) and strike-through to denote wording to be deleted (deleted wording).]

2.3.3 ASHRAE Publications. American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle NE, Atlanta, GA 30329-2305. ASHRAE 15, Safety Code Standard for Mechanical Refrigeration Systems, 20072013. C.2.2 ASHRAE Publications. American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, NE, Atlanta, GA 30329-2305. ASHRAE 15, Safety Code Standard for Mechanical Refrigeration Systems, 20072013. All references to ASHRAE Standard 15 should be editorially corrected from the old title to the new title throughout the document. Example Footnote f of Table 4.4.2 fFor classification of areas involving ammonia, see ASHRAE 15, Safety Code Standard for Mechanical Refrigeration Systems, and ANSI/CGA G2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia

4. Statement of Problem and Substantiation for Public Input: (Note: State the problem that would be resolved by your recommendation; give the specific reason for your Public Input, including copies of tests, research papers, fire experience, etc. If more than 200 words, it may be abstracted for publication.)

There are outdated references to ASHRAE Standard 15. This proposes to update the reference title and year where it appears in this standard

mmaynard

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I hereby grant and assign to the NFPA all and full rights in copyright in this Public Input (including both the Proposed Text and the Statement of Problem and Substantiation). I understand that I acquire no rights in any publication of NFPA in which this Public Input in this or another similar or analogous form is used. Except to the extent that I do not have authority to make an assignment in materials that I have identified in (b) above, I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this assignment.

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1/30/2014


2.3.4 ASTM Publications.


ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method), 2008 08(2014) .


Update the year date for standard(s)


Submitter Full Name: Steve Mawn

Organization: ASTM International

Street Address:

City:

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Submittal Date: Mon Jul 07 12:18:08 EDT 2014


4 of 58 7/9/2014 3:13 PM


3.3.4 Combustible Liquid.

Any liquid that has a closed-cup flash point at or above 100°F (37.8°C), as determined by the corresponding test proceduresand apparatus set forth in Section 4 . 4 of NFPA 30, Flammable and Combustible Liquids Code . Combustible liquids areclassified according to Section 4.3 of NFPA 30. [ 30, 2012] (see 4.1)

3.3.4.1 Class II Liquid.

Any liquid that has a flash point at or above 100°F (37.8°C) and below 140°F (60°C). [30:4.3.2(1)]

3.3.4.2 Class III Liquid.

Any liquid that has a flash point at or above 140°F (60°C). [30:4.3.2(2)]

3.3.4.3 Class IIIA Liquid.

Any liquid that has a flash point at or above 140°F (60°C), but below 200°F (93°C). [30:4.3.2(2)(a)]

3.3.4.4 Class IIIB Liquid.

Any liquid that has a flash point at or above 200°F (93°C). [30:4.3.2(2)(b)]


Definitions cannot contain references to codes, standards or regulations as they are not enforceable. The information is being placed in the body.



Public Input No. 23-NFPA 497-2014 [Section No. 3.3.6]

Public Input No. 24-NFPA 497-2014 [Chapter 4]


Submitter Full Name: Marcelo Hirschler

Organization: GBH International

Street Address:

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5 of 58 7/9/2014 3:13 PM

Public Input No. 14-NFPA 497-2014 [ Sections 3.3.5.1, 3.3.5.2 ]

Delete Sections 3.3.5.1 through 3.3.5.2.3 (See accompanying Public Input to place this material in a differentSection)

Sections 3.3.5.1 , 3.3.5.2

3.3.5.1* Combustible Material (Class I, Division).

Class I, Division combustible materials are divided into Groups A, B, C, and D.

3.3.5.1.1 Group A.

Acetylene.

3.3.5.1.2 Group B.

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn orexplode, having either a maximum experimental safe gap (MESG) value less than or equal to 0.45 mm or a minimum ignitingcurrent ratio (MIC ratio) less than or equal to 0.40. Note: A typical Class I, Group B material is hydrogen.

3.3.5.1.3 Group C.

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn orexplode, having either a maximum experimental safe gap (MESG) value greater than 0.45 mm and less than or equal to 0.75mm, or a minimum igniting current ratio (MIC) ratio greater than 0.40 and less than or equal to 0.80. Note: A typical Class I,Group C material is ethylene.

3.3.5.1.4 Group D.

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn orexplode, having either a maximum experimental safe gap (MESG) value greater than 0.75 mm or a minimum igniting current(MIC) ratio greater than 0.80. Note: A typical Class I, Group D material is propane.

3.3.5.2* Combustible Material (Class I, Zone).

Class I, Zone combustible materials are divided into Groups IIC, IIB, and IIA.

3.3.5.2.1 Group IIA.

Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, or flammable gas, flammable liquidproduced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximumexperimental safe gap (MESG) value greater than 0.90 mm or minimum igniting current ratio (MIC ratio) greater than 0.80.

3.3.5.2.2 Group IIB.

Atmospheres containing acetaldehyde, ethylene, or flammable gas, flammable liquid produced vapor, or combustible liquidproduced vapor mixed with air that may burn or explode, having either maximum experimental safe gap (MESG) valuesgreater than 0.50 mm and less than or equal to 0.90 mm or minimum igniting current ratio (MIC ratio) greater than 0.45 andless than or equal to 0.80.

3.3.5.2.3 Group IIC.

Atmospheres containing acetylene, hydrogen, or flammable gas, flammable liquid-produced vapor, or combustible liquidproduced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value lessthan or equal to 0.50 mm or minimum igniting current ratio (MIC ratio) less than or equal to 0.45.


The material contained in the current definition section dealing with Combustible Materials (3.3.5.2.3 through 3.3.5.2.3) does not belong under Definitions but rather needs to be addressed as done under the NEC as explanatory material. The change presented deletes this material in this section and another action places this material into a separate Section, like Section 4 (see other Public Input) again following the NEC, dealing with combustible material.


Submitter Full Name: David Wechsler


Street Address:

City:

State:

Zip:



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3.3.6 Flammable Liquid.

Any liquid that has a closed-cup flash point below 100°F (37.8°C), as determined by the appropriate test procedures andapparatus set forth in Section 4.4 of NFPA 30 , Flammable and Combustible Liquids Code , and and that has a Reid vaporpressure that does not exceed an absolute pressure of 40 psi (276 kPa) at 100°F (37.8°C), as determined by ASTM D 323,Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method) . Flammable liquids are classified accordingto Section 4.3 of NFPA 30. [ 30, 2012] . (see 4.1).

3.3.6.1 Class I Liquid.

Flammable liquids , as defined in 3.3.33.2 and 4.2.3 of NFPA 30, Flammable and Combustible Liquids Code , shall be areclassified as Class I liquids and shall be further subclassified in accordance with Sections 3.3.6.2 through 3.3.6.4: [ 30,2012] (see 4.1).

3.3.6.2 Class IA Liquid.

Any liquid that has a flash point below 73°F (22.8°C) and a boiling point below 100°F (37.8°C) [30: 4.3.1(1)]

3.3.6.3 Class IB Liquid.

Any liquid that has a flash point below 73°F (22.8°C) and a boiling point at or above 100°F (37.8°C) [30: 4.3.1(2)]

3.3.6.4 Class IC Liquid.

Any liquid that has a flash point at or above 73°F (22.8°C), but below 100°F (37.8°C) [30: 4.3.1(3)]


This simply moves the references to other documents because definitions cannot contain them.




Public Input No. 24-NFPA 497-2014 [Chapter 4]




Street Address:

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Chapter 4 Classification of Combustible Materials

4.1 Combustible and flammable liquids criteria

4.1.1 Combustible Liquid. Any liquid that has a closed-cup flash point at or above 100°F (37.8°C), as determined by the testprocedures and apparatus set forth in Section 4.4 of NFPA 30, Flammable and Combustible Liquids Code. Combustibleliquids are classified according to Section 4.3 of NFPA 30.

4.1.2 Flammable Liquid. Any liquid that has a closed-cup flash point below 100°F (37.8°C), as determined by the testprocedures and apparatus set forth in Section 4.4 of

NFPA 30, Flammable and Combustible Liquids Code, and a Reid vapor pressure that does not exceed an absolute pressureof 40 psi (276 kPa) at 100°F (37.8°C), as determined by ASTM D 323, Standard Test Method for Vapor Pressure ofPetroleum Products (Reid Method). Flammable liquids are classified according to Section 4.3 of NFPA 30.

4.1.3 Class I Liquid. Flammable liquids, as defined in 3.3.33.2 and 4.2.3 of NFPA 30, Flammable and Combustible LiquidsCode, shall be classified as Class I liquids and shall be further subclassified in accordance with Sections 4.1.3.1 through4.1.3.3.

4.1.3.1 Class IA Liquid. Any liquid that has a flash point below 73°F (22.8°C) and a boiling point below 100°F (37.8°C).

4.1.3.2 Class IB Liquid. Any liquid that has a flash point below 73°F (22.8°C) and a boiling point at or above 100°F (37.8°C).

4.1.3.3 Class IC Liquid. Any liquid that has a flash point at or above 73°F (22.8°C), but below 100°F (37.8°C).

4.2 National Electrical Code Criteria.

4.1 2 .1

Articles 500 and 505 of the NEC classify a location in which a combustible material is or may be present in the atmosphere insufficient concentrations to produce an ignitible mixture.

4.1 2 .2*

In a Class I hazardous (classified) location, the combustible material present is a flammable gas or vapor.

4.1 2 .3

Class I is further subdivided into either Class I, Division 1 or Class I, Division 2; or Class I, Zone 0, Zone 1, or Zone 2 asdetailed in 4.1.3.1 through 4.1.3.5.

4.1 2 .3.1 Class I, Division 1.

A Class I, Division 1 location is a location

(1) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors can exist under normal operating conditions, or

(2) In which ignitible concentrations of such flammable gases, flammable liquid–produced vapors, or combustible liquidsabove their flash points may exist frequently because of repair or maintenance operations or because of leakage, or

(3) In which breakdown or faulty operation of equipment or processes might release ignitible concentrations of flammablegases, flammable liquid–produced vapors, or combustible liquid–produced vapors and might also cause simultaneousfailure of electrical equipment in such a way as to directly cause the electrical equipment to become a source of ignition.[70:500.5(B)(1)]

4.1 2 .3.2 Class I, Division 2.


(1) In which volatile flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors arehandled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containersor closed systems from which they can escape only in case of accidental rupture or breakdown of such containers orsystems or in case of abnormal operation of equipment, or

(2) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors are normally prevented by positive mechanical ventilation and which might become hazardous throughfailure or abnormal operation of the ventilating equipment, or

(3) That is adjacent to a Class I, Division 1 location, and to which ignitible concentrations of flammable gases, flammableliquid–produced vapors, or combustible liquid–produced vapors above their flash points might occasionally becommunicated unless such communication is prevented by adequate positive-pressure ventilation from a source of cleanair and effective safeguards against ventilation failure are provided.

[70:500.5(B)(2)]


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4.1 2 .3.3 Class I, Zone 0.

A Class I, Zone 0 location is a location in which

(1) Ignitible concentrations of flammable gases or vapors are present continuously, or

(2) Ignitible concentrations of flammable gases or vapors are present for long periods of time. [70:505.5(B)(1)]

4.1 2 .3.4 Class I, Zone 1.

A Class I, Zone 1 location is a location

(1) In which ignitible concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or

(2) In which ignitible concentrations of flammable gases or vapors may exist frequently because of repair or maintenanceoperations or because of leakage; or

(3) In which equipment is operated or processes are carried on, of such a nature that equipment breakdown or faultyoperations could result in the release of ignitible concentrations of flammable gases or vapors and also causesimultaneous failure of electrical equipment in a mode to cause the electrical equipment to become a source of ignition;or

(4) That is adjacent to a Class I, Zone 0 location from which ignitible concentrations of vapors could be communicated,unless communication is prevented by adequate positive pressure ventilation from a source of clean air and effectivesafeguards against ventilation failure are provided. [70:505.5(B)(2)]

4.1.3.5 Class I, Zone 2.


(1) In which ignitible concentrations of flammable gases or vapors are not likely to occur in normal operation and, if they dooccur, will exist only for a short period; or

(2) In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in whichthe liquids, gases, or vapors normally are confined within closed containers of closed systems from which they canescape only as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormaloperation of the equipment with which the liquids or gases are handled, processed, or used; or

(3) In which ignitible concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilationbut which may become hazardous as a result of failure or abnormal operation of the ventilation equipment; or

(4) That is adjacent to a Class I, Zone 1 location, from which ignitible concentrations of flammable gases or vapors could becommunicated, unless such communication is prevented by adequate positive-pressure ventilation from a source ofclean air and effective safeguards against ventilation failure are provided. [70:505.5(B)(3)]

4.1 2 .4

The intent of Articles 500 and 505 of the NEC is to prevent combustible material from being ignited by electrical equipmentand wiring systems.

4.1 2 .5

Electrical installations within hazardous (classified) locations can use various protection techniques. No single protectiontechnique is best in all respects for all types of equipment used in a chemical plant.

4.1 2 .5.1

Explosionproof enclosures, pressurized equipment, and intrinsically safe circuits are applicable to both Division 1 and Division2 locations.

4.1 2 .5.2

Nonincendive equipment is permitted in Division 2 locations.

4.1 2 .5.3*

Portable electronic products (PEPs) meeting the requirements for PEP-1 or PEP-2 of ANSI/ISA-RP12.12.03 RecommendedPractice for Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I, Zone 2, and Class III, Division 1and 2 Hazardous (Classified) Locations, are considered suitable for use in Division 2 and Zone 2 locations.

4.1 2 .5.4

Nonsparking electrical equipment and other less restrictive equipment, as specified in the NEC, are permitted in Division 2locations.

4.1 2 .6

Factors such as corrosion, weather, maintenance, equipment standardization and interchangeability, and possible processchanges or expansion frequently dictate the use of special enclosures or installations for electrical systems. However, suchfactors are outside the scope of this recommended practice, which is concerned entirely with the proper application ofelectrical equipment to avoid ignition of combustible materials.

4.1 2 .7

For the purpose of this recommended practice, areas not classified as Class I, Division 1; Class I, Division 2: or as Class I,Zone 0, Zone 1, or Zone 2, are “unclassified” areas.

4.2 3 Behavior of Class I (Combustible Material) Gases, Vapors, and Liquids.


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4.2 3 .1 Lighter-than-Air (Vapor Density Less than 1.0) Gases.

These gases tend to dissipate rapidly in the atmosphere. They will not affect as great an area as will heavier-than-air gases orvapors. Except in enclosed spaces, such gases seldom accumulate to form an ignitible mixture near grade level, where mostelectrical installations are located. A lighter-than-air gas that has been cooled sufficiently could behave like a heavier-than-airgas until it absorbs heat from the surrounding atmosphere.

4.2 3 .2 Heavier-than-Air (Vapor Density Greater than 1.0) Gases.

These gases tend to fall to grade level when released. The gas could remain for a significant period of time, unless dispersedby natural or forced ventilation. A heavier-than-air gas that has been heated sufficiently to decrease its density could behavelike a lighter-than-air gas until cooled by the surrounding atmosphere.

4.2 3 .3 Applicable to All Densities.

As the gas diffuses into the surrounding air, the density of the mixture approaches that of air.

4.2 3 .4 Compressed Liquefied Gases.

These gases are stored above their normal boiling point but are kept in the liquid state by pressure. When released, the liquidimmediately expands and vaporizes, creating large volumes of cold gas. The cold gas behaves like a heavier-than-air gas.

4.2 3 .5 Cryogenic Flammable Liquids and Other Cold Liquefied Combustible Materials.

Cryogenic liquids are generally handled below -150°F (-101°C). These behave like flammable liquids when they are spilled.Small liquid spills will immediately vaporize, but larger spills may remain in the liquid state for an extended time. As the liquidabsorbs heat, it vaporizes and could form an ignitible mixture. Some liquefied combustible materials (not cryogenic) are storedat low temperatures and at pressures close to atmospheric pressure; these include anhydrous ammonia, propane, ethane,ethylene, and propylene. These materials will behave as described in 4.2.1 or 4.2.2.

4.2 3 .6 Flammable Liquids.

When released in appreciable quantity, a Class I liquid will begin to evaporate at a rate that depends on its volatility: the lowerthe flash point, the greater the volatility; hence, the faster the evaporation. The vapors of Class I liquids form ignitible mixtureswith air at ambient temperatures more or less readily. Even when evolved rapidly, the vapors tend to disperse rapidly,becoming diluted to a concentration below the lower flammable limit (LFL). Until this dispersion takes place, however, thesevapors will behave like heavier-than-air gases. Class I liquids normally will produce ignitible mixtures that will travel a finitedistance from the point of origin; thus, they will normally require area classification for proper electrical system design.

4.2 3 .7 Combustible Liquids.

A combustible liquid will form an ignitible mixture only when heated above its flash point.

4.2 3 .7.1

With Class II liquids, the degree of hazard is lower because the vapor release rate is low at normal handling and storagetemperatures. In general, these liquids will not form ignitible mixtures with air at ambient temperatures unless heated abovetheir flash points. Also, the vapors will not travel as far because they tend to condense as they are cooled by ambient air.Class II liquids should be considered capable of producing an ignitible mixture near the point of release when handled,processed, or stored under conditions where the liquid could exceed its flash point.

4.2 3 .7.2

Class IIIA liquids do not form ignitible mixtures with air at ambient temperatures unless heated above their flash points.Furthermore, the vapors cool rapidly in air and condense. Hence, the extent of the area requiring electrical classification willbe very small or nonexistent.

4.2 3 .7.3

Class IIIB liquids seldom evolve enough vapors to form ignitible mixtures even when heated, and they are seldom ignited byproperly installed and maintained general purpose electrical equipment. A Class IIIB liquid will cool below its flash point veryquickly when released. Therefore, area classification is seldom needed and Class IIIB liquids are not included in Table 4.4.2.

4.3 4 Conditions Necessary for Ignition.

In a Class I area, the following three conditions must be satisfied for the combustible material to be ignited by the electricalinstallation:

(1) A combustible material must be present.

(2) It must be mixed with air in the proportions required to produce an ignitible mixture.

(3) There must be a release of sufficient energy to ignite the mixture.

4.4 5 Classification of Class I Combustible Materials.

4.4 5 .1

Combustible materials are classified into four Class I, Division Groups: A, B, C, and D; or three Class I, Zone Groups: IIA, IIB,and IIC, depending on their properties.


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4.4 5 .2*


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An alphabetical listing of selected combustible materials, with their group classification and relevant physical properties, isprovided in Table 4.4.2.

Table 4.4 5 .2 Selected Chemicals

Chemical CAS No.Class I

DivisionGroup

TypeaFlashPoint(°C)

AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Acetaldehyde 75-07-0 Cd I -38 175 4.0 60.0 1.5 874.9 IIA 0.37 0.98 0.92

Acetic Acid 64-19-7 Dd II 39 426 19.9 2.1 15.6 IIA 2.67 1.76

Acetic Acid-

tert-Butyl Ester540-88-5 D II 1.7 9.8 4.0 40.6

Acetic Anhydride 108-24-7 D II 49 316 2.7 10.3 3.5 4.9 IIA 1.23

Acetone 67-64-1 Dd I –20 465 2.5 12.8 2.0 230.7 IIA 1.15 1.00 1.02

Acetone Cyanohydrin 75-86-5 D IIIA 74 688 2.2 12.0 2.9 0.3

Acetonitrile 75-05-8 D I 6 524 3.0 16.0 1.4 91.1 IIA 1.50

Acetylene 74-86-2 Ad GAS 305 2.5 100 0.9 36600 IIC 0.017 0.28 0.25

Acrolein (Inhibited) 107-02-8 B(C)d I 235 2.8 31.0 1.9 274.1 IIB 0.13

Acrylic Acid 79-10-7 D II 54 438 2.4 8.0 2.5 4.3 IIB 0.86

Acrylonitrile 107-13-1 Dd I 0 481 3 17 1.8 108.5 IIB 0.16 0.78 0.87

Adiponitrile 111-69-3 D IIIA 93 550 1.0 0.002

Allyl Alcohol 107-18-6 Cd I 22 378 2.5 18.0 2.0 25.4 IIB 0.84

Allyl Chloride 107-05-1 D I -32 485 2.9 11.1 2.6 366 IIA 1.33 1.17

Allyl Glycidyl Ether 106-92-3 B(C)e II 57 3.9

Alpha-Methyl Styrene 98-83-9 D II 574 0.8 11.0 4.1 2.7

n-Amyl Acetate 628-63-7 D I 25 360 1.1 7.5 4.5 4.2 IIA 1.02

sec-Amyl Acetate 626-38-0 D I 23 1.1 7.5 4.5 IIA

Ammonia 7664-41-7 Dd,f GAS 651 15 28 0.6 7498.0 IIA 680 6.85 3.17

Aniline 62-53-3 D IIIA 70 615 1.2 8.3 3.2 0.7 IIA

Benzene 71-43-2 Dd I -11 498 1.2 7.8 2.8 94.8 IIA 0.20 1.00 0.99

Benzyl Chloride 98-87-3 D IIIA 585 1.1 4.4 0.5

Bromopropyne 106-96-7 D I 10 324 3.0

n-Butane 106-97-8 Dd,g GAS 288 1.9 8.5 2.0 IIA 0.25 0.94 1.07

1,3-Butadiene 106-99-0 B(D)d,e GAS 420 2.0 11.5 1.9 IIB 0.13 0.76 0.79

1-Butanol 71-36-3 Dd I 36 343 1.4 11.2 2.6 7.0 IIA 0.91

Butyl alcohol (s)(butanol-2)

78-92-2 Dd I 23.8 405 1.7 9.8 2.6 IIA

Butylamine 109-73-9 D GAS -12 312 1.7 9.8 2.5 92.9 IIA 1.13

Butylene 25167-67-3 D I 385 1.6 10.0 1.9 2214.6 IIA 0.94

n-Butyraldehyde 123-72-8 Cd I -12 218 1.9 12.5 2.5 112.2 IIA 0.92

n-Butyl Acetate 123-86-4 Dd I 22 421 1.7 7.6 4.0 11.5 IIA 1.08 1.04

sec-Butyl Acetate 105-46-4 D II -8 1.7 9.8 4.0 22.2

tert-Butyl Acetate 540-88-5 D II 1.7 9.8 4.0 40.6

n-Butyl Acrylate(Inhibited)

141-32-2 D II 49 293 1.7 9.9 4.4 5.5 IIB 0.88

n-Butyl Glycidyl Ether 2426-08-6 B(C)e II

n-Butyl Formal 110-62-3 C IIIA 34.3

Butyl Mercaptan 109-79-5 C I 2 3.1 46.4

Butyl-2-Propenoate 141-32-2 D II 49 1.7 9.9 4.4 5.5


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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

para tert-Butyl Toluene 98-51-1 D IIIA

n-Butyric Acid 107-92-6 Dd IIIA 72 443 2.0 10.0 3.0 0.8

Carbon Disulfide 75-15-0 d,h I -30 90 1.3 50.0 2.6 358.8 IIC 0.009 0.39 0.20

Carbon Monoxide 630-08-0 Cd GAS 609 12.5 74 0.97 IIB 0.54

Chloroacetaldehyde 107-20-0 C IIIA 88 63.1

Chlorobenzene 108-90-7 D I 29 593 1.3 9.6 3.9 11.9

1-Chloro-1-

Nitropropane2425-66-3 C IIIA

Chloroprene 126-99-8 D GAS -20 4.0 20.0 3.0

Cresol 1319-77-3 D IIIA 81 559 1.1 3.7

Crotonaldehyde 4170-30-3 Cd I 13 232 2.1 15.5 2.4 33.1 IIB 0.81

Cumene 98-82-8 D I 36 424 0.9 6.5 4.1 4.6 IIA 1.05

Cyclohexane 110-82-7 D I -17 245 1.3 8.0 2.9 98.8 IIA 0.22 1.0 0.94

Cyclohexanol 108-93-0 D IIIA 68 300 3.5 0.7 IIA

Cyclohexanone 108-94-1 D II 44 420 1.1 9.4 3.4 4.3 IIA 0.98

Cyclohexene 110-83-8 D I -6 244 1.2 2.8 89.4 IIA 0.97

Cyclopropane 75-19-4 Dd I 503 2.4 10.4 1.5 5430 IIA 0.17 0.84 0.91

p-Cymene 99-87-6 D II 47 436 0.7 5.6 4.6 1.5 IIA

Decene 872-05-9 D II 235 4.8 1.7

n-Decaldehyde 112-31-2 C IIIA 0.09

n-Decanol 112-30-1 D IIIA 82 288 5.3 0.008

Decyl Alcohol 112-30-1 D IIIA 82 288 5.3 0.008

Diacetone Alcohol 123-42-2 D IIIA 64 603 1.8 6.9 4.0 1.4

Di-Isobutylene 25167-70-8 Dd I 2 391 0.8 4.8 3.8 0.96

Di-Isobutyl Ketone 108-83-8 D II 60 396 0.8 7.1 4.9 1.7

o-Dichlorobenzene 955-50-1 D IIIA 66 647 2.2 9.2 5.1 IIA

1,4-Dichloro-2,3Epoxybutane

3583-47-9 Dd I 1.9 8.5 2.0 IIA 0.25 0.98 1.07

1,1-Dichloroethane 1300-21-6 D I 438 6.2 16.0 3.4 227 IIA 1.82

1,2-Dichloroethylene 156-59-2 D I 97 460 5.6 12.8 3.4 204 IIA 3.91

1,1-Dichloro-1-

Nitroethane594-72-9 C IIIA 76 5.0

1,3-Dichloropropene 10061-02-6 D I 35 5.3 14.5 3.8

Dicyclopentadiene 77-73-6 C I 32 503 2.8 IIA 0.91

Diethylamine 109-87-9 Cd I -28 312 1.8 10.1 2.5 IIA 1.15

Diethylaminoethanol 100-37-8 C IIIA 60 320 4.0 1.6 IIA

Diethyl Benzene 25340-17-4 D II 57 395 4.6

Diethyl Ether (EthylEther)

60-29-7 Cd I -45 160 1.9 36 2.6 538 IIB 0.19 0.88 0.83

Diethylene GlycolMonobutyl Ether

112-34-5 C IIIA 78 228 0.9 24.6 5.6 0.02

Diethylene GlycolMonomethyl Ether

111-77-3 C IIIA 93 241 0.2

n-n-Dimethyl Aniline 121-69-7 C IIIA 63 371 1.0 4.2 0.7

Dimethyl Formamide 68-12-2 D II 58 455 2.2 15.2 2.5 4.1 IIA 1.08

Dimethyl Sulfate 77-78-1 D IIIA 83 188 4.4 0.7

Dimethylamine 124-40-3 C GAS 400 2.8 14.4 1.6 IIA

2,2-Dimethylbutane 75-83-2 Dg I -48 405 319.3


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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

2,3-Dimethylbutane 78-29-8 Dg I 396

3,3-Dimethylheptane 1071-26-7 Dg I 325 10.8

2,3-Dimethylhexane 31394-54-4 Dg I 438

2,3-Dimethylpentane 107-83-5 Dg I 335 211.7

Di-N-Propylamine 142-84-7 C I 17 299 27.1 IIA 0.95

1,4-Dioxane 123-91-1 Cd I 12 180 2.0 22.0 3.0 38.2 IIB 0.19 0.70

Dipentene 138-86-3 D II 45 237 0.7 6.1 4.7 IIA 1.18

Dipropylene GlycolMethyl Ether

34590-94-8 C IIIA 85 1.1 3.0 5.1 0.5

Diisopropylamine 108-18-9 C GAS -6 316 1.1 7.1 3.5 IIA 1.02

Dodecene 6842-15-5 D IIIA 100 255

Epichlorohydrin 3132-64-7 Cd I 33 411 3.8 21.0 3.2 13.0

Ethane 74-84-0 Dd GAS -29 472 3.0 12.5 1.0 IIA 0.24 0.82 0.91

Ethanol 64-17-5 Dd I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89

Ethylamine 75-04-7 Dd I -18 385 3.5 14.0 1.6 1048 2.4

Ethylene 74-85-1 Cd GAS 490 2.7 36.0 1.0 IIB 0.070 0.53 0.65

Ethylenediamine 107-15-3 Dd I 33 385 2.5 12.0 2.1 12.5

Ethylenimine 151-56-4 Cd I -11 320 3.3 54.8 1.5 211 0.48

Ethylene Chlorohydrin 107-07-3 D IIIA 59 425 4.9 15.9 2.8 7.2

Ethylene Dichloride 107-06-2 Dd I 13 413 6.2 16.0 3.4 79.7

Ethylene GlycolMonoethyl EtherAcetate

111-15-9 C II 47 379 1.7 4.7 2.3 IIA 0.53 0.97

Ethylene GlycolMonobutyl EtherAcetate

112-07-2 C IIIA 340 0.9 8.5 0.9

Ethylene GlycolMonobutyl Ether

111-76-2 C IIIA 238 1.1 12.7 4.1 1.0

Ethylene GlycolMonoethyl Ether

110-80-5 C II 235 1.7 15.6 3.0 5.4 0.84

Ethylene GlycolMonomethyl Ether

109-86-4 D II 285 1.8 14.0 2.6 9.2 0.85

Ethylene Oxide 75-21-8 B(C)d,e I -20 429 3 100 1.5 1314 IIB 0.065 0.47 0.59

2-Ethylhexaldehyde 123-05-7 C II 52 191 0.8 7.2 4.4 1.9

2-Ethylhexanol 104-76-7 D IIIA 81 0.9 9.7 4.5 0.2

2-Ethylhexyl Acrylate 103-09-3 D IIIA 88 252 0.3

Ethyl Acetate 141-78-6 Dd I -4 427 2.0 11.5 3.0 93.2 IIA 0.46 0.99

Ethyl Acrylate(Inhibited)

140-88-5 Dd I 9 372 1.4 14.0 3.5 37.5 IIA 0.86

Ethyl Alcohol 64-17-5 Dd I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89

Ethyl Sec-Amyl Ketone 541-85-5 D II 59

Ethyl Benzene 100-41-4 D I 15 432 0.8 6.7 3.7 9.6

Ethyl Butanol 97-95-0 D II 57 1.2 7.7 3.5 1.5

Ethyl Butyl Ketone 106-35-4 D II 46 4.0 3.6

Ethyl Chloride 75-00-3 D GAS -50 519 3.8 15.4 2.2

Ethyl Formate 109-94-4 D GAS -20 455 2.8 16.0 2.6 IIA 0.94


14 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Ethyl Mercaptan 75-08-1 Cd I -18 300 2.8 18.0 2.1 527.4 IIB 0.90 0.90

n-Ethyl Morpholine 100-74-3 C I 32 4.0

2-Ethyl-3-PropylAcrolein

645-62-5 C IIIA 68 4.4

Ethyl Silicate 78-10-4 D II 7.2

Formaldehyde (Gas) 50-00-0 B GAS 430 7 73 1.0 IIB 0.57

Formic Acid 64-18-6 D II 50 434 18.0 57.0 1.6 42.7 IIA 1.86

Fuel Oil 1 8008-20-6 DII or

IIIAk 38–72k 210 0.7 5.0

Fuel Oil 2II or

IIIAk 52–96k 257

Fuel Oil 6IIIA or

IIIBk 66–132k

Furfural 98-01-1 C IIIA 60 316 2.1 19.3 3.3 2.3 0.94

Furfuryl Alcohol 98-00-0 C IIIA 75 490 1.8 16.3 3.4 0.6

Gasoline 8006-61-9 Dd I -46 280 1.4 7.6 3.0

n-Heptane 142-82-5 Dd I -4 204 1.0 6.7 3.5 45.5 IIA 0.24 0.88 0.91

n-Heptene 81624-04-6 Dg I -1 204 3.4 0.97

n-Hexane 110-54-3 Dd,g I -23 225 1.1 7.5 3.0 152 IIA 0.24 0.88 0.93

Hexanol 111-27-3 D IIIA 63 3.5 0.8 IIA 0.98

2-Hexanone 591-78-6 D I 35 424 1.2 8.0 3.5 10.6

Hexene 592-41-6 D I -26 245 1.2 6.9 186

sec-Hexyl Acetate 108-84-9 D II 45 5.0

Hydrazine 302-01-2 C II 38 23 98.0 1.1 14.4

Hydrogen 1333-74-0 Bd GAS 500 4 75 0.1 IIC 0.019 0.25 0.28

Hydrogen Cyanide 74-90-8 Cd GAS -18 538 5.6 40.0 0.9 IIB 0.80

Hydrogen Selenide 7783-07-5 C I 7793

Hydrogen Sulfide 7783-06-4 Cd GAS 260 4.0 44.0 1.2 IIB 0.068 0.90

Isoamyl Acetate 123-92-2 D I 25 360 1.0 7.5 4.5 6.1

Isoamyl Alcohol 123-51-3 D II 43 350 1.2 9.0 3.0 3.2 IIA 1.02

Isobutane 75-28-5 Dg GAS 460 1.8 8.4 2.0 IIA 0.95

Isobutyl Acetate 110-19-0 Dd I 18 421 2.4 10.5 4.0 17.8

Isobutyl Acrylate 106-63-8 D I 427 4.4 7.1

Isobutyl Alcohol 78-83-1 Dd I -40 416 1.2 10.9 2.5 10.5 IIA 0.92 0.98

Isobutyraldehyde 78-84-2 C GAS -40 196 1.6 10.6 2.5 IIA 0.92

Isodecaldehyde 112-31-2 C IIIA 5.4 0.09

Isohexane 107-83-5 Dg 264 211.7 IIA 1.00

Isopentane 78-78-4 Dg 420 688.6

Isooctyl Aldehyde 123-05-7 C II 197 1.9

Isophorone 78-59-1 D 84 460 0.8 3.8 4.8 0.4

Isoprene 78-79-5 Dd I -54 220 1.5 8.9 2.4 550.6

Isopropyl Acetate 108-21-4 D I 460 1.8 8.0 3.5 60.4

Isopropyl Ether 108-20-3 Dd I -28 443 1.4 7.9 3.5 148.7 IIA 1.14 0.94

Isopropyl GlycidylEther

4016-14-2 C I


15 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Isopropylamine 75-31-0 D GAS -26 402 2.3 10.4 2.0 2.0

Kerosene 8008-20-6 D II 72 210 0.7 5.0 IIA

Liquefied PetroleumGas

68476-85-7 D I 405

Mesityl Oxide 141-97-9 Dd I 31 344 1.4 7.2 3.4 47.6

Methane 74-82-8 Dd GAS 600 5 15 0.6 IIA 0.28 1.00 1.12

Methanol 67-56-1 Dd I 12 385 6.0 36.0 1.1 126.3 IIA 0.14 0.82 0.92

Methyl Acetate 79-20-9 D GAS -10 454 3.1 16.0 2.6 IIA 1.08 0.99

Methyl Acrylate 96-33-3 D GAS -3 468 2.8 25.0 3.0 IIB 0.98 0.85

Methyl Alcohol 67-56-1 Dd I 385 6.0 36 1.1 126.3 IIA 0.91

Methyl Amyl Alcohol 108-11-2 D II 41 1.0 5.5 3.5 5.3 IIA 1.01

Methyl Chloride 74-87-3 D GAS -46 632 8.1 17.4 1.7 IIA 1.00

Methyl Ether 115-10-6 Cd GAS -41 350 3.4 27.0 1.6 IIB 0.85 0.84

Methyl Ethyl Ketone 78-93-3 Dd I -6 404 1.4 11.4 2.5 92.4 IIB 0.53 0.92 0.84

Methyl Formal 534-15-6 Cd I 1 238 3.1

Methyl Formate 107-31-3 D GAS -19 449 4.5 23.0 2.1 IIA 0.94

2-Methylhexane 31394-54-4 Dg I 280

Methyl Isobutyl Ketone 108-10-1 Dd I 13 440 1.2 8.0 3.5 11

Methyl Isocyanate 624-83-9 D GAS -15 534 5.3 26.0 2.0 IIA 1.21

Methyl Mercaptan 74-93-1 C GAS -18 3.9 21.8 1.7

Methyl Methacrylate 80-62-6 D I 10 422 1.7 8.2 3.6 37.2 IIA 0.95

Methyl N-Amyl Ketone 110-43-0 D II 49 393 1.1 7.9 3.9 3.8

Methyl Tertiary ButylEther

1634-04-4 D I -80 435 1.6 8.4 0.2 250.1

2-Methyloctane 3221-61-2 220 6.3

2-Methylpropane 75-28-5 Dg I 460 2639

Methyl-1-Propanol 78-83-1 Dd I -40 416 1.2 10.9 2.5 10.1 IIA 0.98

Methyl-2-Propanol 75-65-0 Dd I 10 360 2.4 8.0 2.6 42.2

2-Methyl-5-EthylPyridine

104-90-5 D 74 1.1 6.6 4.2

Methylacetylene 74-99-7 Cd I 1.7 1.4 4306 0.11

Methylacetylene-

Propadiene27846-30-6 C I IIB 0.74

Methylal 109-87-5 C I -18 237 1.6 17.6 2.6 398

Methylamine 74-89-5 D GAS 430 4.9 20.7 1.0 IIA 1.10

2-Methylbutane 78-78-4 Dg -56 420 1.4 8.3 2.6 688.6

Methylcyclohexane 208-87-2 D I -4 250 1.2 6.7 3.4 0.27

Methylcyclohexanol 25630-42-3 D 68 296 3.9

2-Methycyclohexanone 583-60-8 D II 3.9

2-Methylheptane Dg 420

3-Methylhexane 589-34-4 Dg 280 61.5

3-Methylpentane 94-14-0 Dg 278


2-Methyl-1-Propanol 78-83-1 Dd I -40 223 1.2 10.9 2.5 10.5


16 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

2-Methyl-2-Propanol 75-65-0 Dd I 478 2.4 8.0 2.6 42.2

2-Methyloctane 2216-32-2 Dg 220

3-Methyloctane 2216-33-3 Dg 220 6.3


Monoethanolamine 141-43-5 D 85 410 2.1 0.4 IIA

Monoisopropanolamine 78-96-6 D 77 374 2.6 1.1

Monomethyl Aniline 100-61-8 C 482 0.5

Monomethyl Hydrazine 60-34-4 C I 23 194 2.5 92.0 1.6

Morpholine 110-91-8 Cd II 35 310 1.4 11.2 3.0 10.1 IIA 0.95

Naphtha (Coal Tar) 8030-30-6 D II 42 277 IIA

Naphtha (Petroleum) 8030-30-6 Dd,i I 42 288 1.1 5.9 2.5 IIA

Neopentane 463-82-1 Dg -65 450 1.4 8.3 2.6 1286

Nitrobenzene 98-95-3 D 88 482 1.8 4.3 0.3 IIA 0.94

Nitroethane 79-24-3 C I 28 414 3.4 2.6 20.7 IIB 0.87

Nitromethane 75-52-5 C I 35 418 7.3 2.1 36.1 IIA 0.92 1.17

1-Nitropropane 108-03-2 C I 34 421 2.2 3.1 10.1 IIB 0.84

2-Nitropropane 79-46-9 Cd I 28 428 2.6 11.0 3.1 17.1

n-Nonane 111-84-2 Dg I 31 205 0.8 2.9 4.4 4.4 IIA

Nonene 27214-95-8 D I 0.8 4.4

Nonyl Alcohol 143-08-8 D 0.8 6.1 5.0 0.02 IIA

n-Octane 111-65-9 Dd,g I 13 206 1.0 6.5 3.9 14.0 IIA 0.94

Octene 25377-83-7 D I 8 230 0.9 3.9

n-Octyl Alcohol 111-87-5 D 4.5 0.08 IIA 1.05

n-Pentane 109-66-0 Dd,g I -40 243 1.5 7.8 2.5 513 IIA 0.28 0.97 0.93

1-Pentanol 71-41-0 Dd I 33 300 1.2 10.0 3.0 2.5 IIA 1.30

2-Pentanone 107-87-9 D I 7 452 1.5 8.2 3.0 35.6 IIA 0.99

1-Pentene 109-67-1 D I -18 275 1.5 8.7 2.4 639.7

2-Pentene 109-68-2 D I -18 2.4

2-Pentyl Acetate 626-38-0 D I 23 1.1 7.5 4.5

Phenylhydrazine 100-63-0 D 89 3.7 0.03

Process Gas > 30%H2

Bj GAS 520 4.0 75.0 0.1 0.019 0.45

Propane 74-98-6 Dd GAS 450 2.1 9.5 1.6 IIA 0.25 0.82 0.97

1-Propanol 71-23-8 Dd I 15 413 2.2 13.7 2.1 20.7 IIA 0.89

2-Propanol 67-63-0 Dd I 12 399 2.0 12.7 2.1 45.4 IIA 0.65 1.00

Propiolactone 57-57-8 D 2.9 2.5 2.2

Propionaldehyde 123-38-6 C I -9 207 2.6 17.0 2.0 318.5 IIB 0.86

Propionic Acid 79-09-4 D II 54 466 2.9 12.1 2.5 3.7 IIA 1.10

Propionic Anhydride 123-62-6 D 74 285 1.3 9.5 4.5 1.4

n-Propyl Acetate 109-60-4 D I 14 450 1.7 8.0 3.5 33.4 IIA 1.05

n-Propyl Ether 111-43-3 Cd I 21 215 1.3 7.0 3.5 62.3

Propyl Nitrate 627-13-4 Bd I 20 175 2.0 100.0

Propylene 115-07-1 Dd GAS 460 2.4 10.3 1.5 IIA 0.28 0.91

Propylene Dichloride 78-87-5 D I 16 557 3.4 14.5 3.9 51.7 IIA 1.32


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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Propylene Oxide 75-56-9 B(C)d,e I -37 449 2.3 36.0 2.0 534.4 IIB 0.13 0.70

Pyridine 110-86-1 Dd I 20 482 1.8 12.4 2.7 20.8 IIA

Styrene 100-42-5 Dd I 31 490 0.9 6.8 3.6 6.1 IIA 1.21

Tetrahydrofuran 109-99-9 Cd I -14 321 2.0 11.8 2.5 161.6 IIB 0.54 0.87

Tetrahydronaphthalene 119-64-2 D IIIA 385 0.8 5.0 4.6 0.4

Tetramethyl Lead 75-74-1 C II 38 9.2

Toluene 108-88-3 Dd I 4 480 1.1 7.1 3.1 28.53 IIA 0.24

n-Tridecene 2437-56-1 D IIIA 0.6 6.4 593.4

Triethylamine 121-44-8 Cd I -9 249 1.2 8.0 3.5 68.5 IIA 0.75 1.05

Triethylbenzene 25340-18-5 D 83 56.0 5.6

2,2,3-Trimethylbutane Dg 442


2,2,3-Trimethylpentane Dg 396

2,2,4-Trimethylpentane Dg 415 IIA 1.04


Tripropylamine 102-69-2 D II 41 4.9 1.5 IIA 1.13

Turpentine 8006-64-2 D I 35 253 0.8 4.8

n-Undecene 28761-27-5 D IIIA 0.7 5.5

UnsymmetricalDimethyl Hydrazine

57-14-7 Cd I -15 249 2.0 95.0 1.9 IIB 0.85

Valeraldehyde 110-62-3 C I 280 222 3.0 34.3

Vinyl Acetate 108-05-4 Dd I -6 402 2.6 13.4 3.0 113.4 IIA 0.70 0.94

Vinyl Chloride 75-01-4 Dd GAS -78 472 3.6 33.0 2.2 IIA 0.96

Vinyl Toluene 25013-15-4 D 52 494 0.8 11.0 4.1

Vinylidene Chloride 75-35-4 D I 570 6.5 15.5 3.4 599.4 IIA 3.91

Xylene 1330-20-7 Dd I 25 464 0.9 7.0 3.7 IIA 0.2 1.09

Xylidine 121-69-7 C IIIA 63 371 1.0 4.2 0.7

aType is used to designate if the material is a gas, flammable liquid, or combustible liquid. (See 4.2.6 and 4.2.7.)

bVapor pressure reflected in units of mm Hg at 25°C (77°F) unless stated otherwise.

cClass I, Zone Groups are based on 1996 IEC TR3 60079-20, Electrical apparatus for explosive gas atmospheres — Part 20:Data for flammable gases and vapours, relating to the use of electrical apparatus, which contains additional data on MESGand group classifications.

dMaterial has been classified by test.

eWhere all conduit runs into explosionproof equipment are provided with explosionproof seals installed within 450 mm (18 in.)of the enclosure, equipment for the group classification shown in parentheses is permitted.

fFor classification of areas involving ammonia, see ASHRAE 15, Safety Code for Mechanical Refrigeration, and ANSI/CGAG2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia.

gCommercial grades of aliphatic hydrocarbon solvents are mixtures of several isomers of the same chemical formula (ormolecular weight). The autoignition temperatures (AIT) of the individual isomers are significantly different. The electricalequipment should be suitable for the AIT of the solvent mixture. (See A.4.4.2.)

hCertain chemicals have characteristics that require safeguards beyond those required for any of the above groups. Carbondisulfide is one of these chemicals because of its low autoignition temperature and the small joint clearance necessary toarrest its flame propagation.

iPetroleum naphtha is a saturated hydrocarbon mixture whose boiling range is 20°C to 135°C (68°F to 275°F). It is also


18 of 58 7/9/2014 3:13 PM

known as benzine, ligroin, petroleum ether, and naphtha.

jFuel and process gas mixtures found by test not to present hazards similar to those of hydrogen may be grouped based onthe test results.

k Liquid type and flash point vary due to regional blending differences.


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4.4 5 .3


20 of 58 7/9/2014 3:13 PM

Table 4.4.3 provides a cross-reference of selected chemicals sorted by their Chemical Abstract Service (CAS) numbers.

Table 4.4 5 .3 Cross-Reference of Chemical CAS Number to Chemical Name

CAS No. Chemical Name

50-00-0 Formaldehyde (Gas)

57-14-7 Unsymmetrical Dimethyl Hydrazine

57-57-8 Propiolactone

60-29-7 Diethyl Ether (Ethyl Ether)

60-34-4 Monomethyl Hydrazine

62-53-3 Aniline

64-17-5 Ethanol

64-17-5 Ethyl Alcohol

64-18-6 Formic Acid

64-19-7 Acetic Acid

67-56-1 Methanol

67-56-1 Methyl Alcohol

67-63-0 2-Propanol

67-64-1 Acetone

68-12-2 Dimethyl Formamide

71-23-8 1-Propanol

71-36-3 1-Butanol

71-36-5 2-Butanol

71-41-0 1-Pentanol

71-43-2 Benzene

74-82-8 Methane

74-84-0 Ethane

74-85-1 Ethylene

74-86-2 Acetylene

74-87-3 Methyl Chloride

74-89-5 Methylamine

74-90-8 Hydrogen Cyanide

74-93-1 Methyl Mercaptan

74-98-6 Propane

74-99-7 Methylacetylene

75-00-3 Ethyl Chloride

75-01-4 Vinyl Chloride

75-04-7 Ethylamine

75-05-8 Acetonitrile

75-07-0 Acetaldehyde

75-08-1 Ethyl Mercaptan

75-15-0 Carbon Disulfide

75-19-4 Cyclopropane

75-21-8 Ethylene Oxide

75-28-5 Isobutane

75-28-5 2-Methylpropane

75-28-5 3-Methylpropane

75-31-0 Isopropylamine

75-35-4 Vinylidene Chloride

75-52-5 Nitromethane

75-56-9 Propylene Oxide

75-65-0 2-Methyl-2-Propanol

75-74-1 Tetramethyl Lead

75-83-2 Dimethylbutane


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75-83-2 Neohexane

75-86-5 Acetone Cyanohydrin

77-78-1 Dimethyl Sulfate

78-10-4 Ethyl Silicate

78-59-1 Isophorone

78-78-4 Isopentane

78-78-4 Methylbutane

78-79-5 Isoprene

78-83-1 Isobutyl Alcohol

78-83-1 Methyl-1-Propanol

78-84-2 Isobutyraldehyde

78-87-5 Propylene Dichloride

78-93-3 Methyl Ethyl Ketone

78-96-6 Monoisopropanolamine

79-09-4 Propionic Acid

79-10-7 Acrylic Acid

79-20-9 Methyl Acetate

79-24-3 Nitroethane

79-46-9 2-Nitropropane

80-62-6 Methyl Methacrylate

96-14-0 3-Methylpentane

96-33-3 Methyl Acrylate

97-95-0 Ethyl Butanol

98-00-0 Furfuryl Alcohol

98-01-1 Furfural

98-51-1 tert-Butyl Toluene

98-82-8 Cumene

98-83-9 Alpha-Methyl Styrene

98-87-3 Benzyl Chloride

98-95-3 Nitrobenzene

99-87-6 p-Cymene

100-41-4 Ethyl Benzene

100-42-5 Styrene

100-61-8 Monomethyl Aniline

100-63-0 Phenylhydrazine

100-74-3 n-Ethyl Morpholine

102-69-2 Tripropylamine

103-09-3 Ethyl Hexyl Acrylate

104-76-7 Ethylhexanol

104-90-5 2-Methyl-5-Ethyl Pyridine

105-46-4 sec-Butyl Acetate

106-35-4 Ethyl Butyl Ketone

106-63-8 Isobutyl Acrylate

106-88-7 Butylene Oxide

106-92-3 Allyl Glycidyl Ether

106-96-7 Bromopropyne

106-97-8 n-Butane

106-99-0 1,3-Butadiene

107-02-8 Acrolein (Inhibited)

107-05-1 Allyl Chloride

107-06-2 Ethylene Dichloride

107-07-3 Ethylene Chlorohydrin


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107-13-1 Acrylonitrile

107-15-3 Ethylenediamine

107-18-6 Allyl Alcohol

107-20-0 Chloroacetaldehyde

107-31-3 Methyl Formate

107-83-5 Dimethylpentane

107-83-5 Isohexane

107-83-5 2-Methylpentane

107-87-9 2-Pentanone

107-92-6 n-Butyric Acid

108-03-2 1-Nitropropane

108-05-4 Vinyl Acetate

108-10-1 Methyl Isobutyl Ketone

108-11-2 Methyl Amyl Alcohol

108-18-9 Diisopropylamine

108-20-3 Isopropyl Ether

108-21-4 Isopropyl Acetate

108-24-7 Acetic Anhydride

108-84-9 sec-Hexyl Acetate

108-88-3 Toluene

108-90-7 Chlorobenzene

108-93-0 Cyclohexanol

108-94-1 Cyclohexanone

109-60-4 n-Propyl Acetate

109-66-0 n-Pentane

109-67-1 1-Pentene

109-68-2 2-Pentene

109-73-9 Butylamine

109-79-5 Butyl Mercaptan

109-86-4 Ethylene Glycol Monomethyl Ether

109-87-5 Methylal

109-94-4 Ethyl Formate

109-99-9 Tetrahydrofuran

110-19-0 Isobutyl Acetate

110-43-0 Methyl n-Amyl Ketone

110-54-3 n-Hexane

110-62-3 n-Butyl Formal

110-62-3 Valeraldehyde

110-80-5 Ethylene Glycol Monoethyl Ether

110-82-7 Cyclohexane

110-83-8 Cyclohexene

110-86-1 Pyridine

110-91-8 Morpholine

111-15-9 Ethylene Glycol Monoethyl Ether Acetate

111-27-3 Hexanol

111-43-3 n-Propyl Ether

111-65-9 n-Octane

111-69-3 Adiponitrile

111-76-2 Ethylene Glycol Monobutyl Ether

111-84-2 n-Nonane

111-87-5 n-Octyl Alcohol

112-07-2 Ethylene Glycol Monobutyl Ether Acetate


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112-30-1 n-Decanol

112-31-2 Isodecaldehyde

112-31-2 n-Decaldehyde

115-07-1 Propylene

115-10-6 Methyl Ether

119-64-2 Tetrahydronaphthalene

121-44-8 Triethylamine

123-05-7 Ethylhexaldehyde

123-05-7 Isooctyl Aldehyde

123-38-6 Propionaldehyde

123-51-3 Isoamyl Alcohol

123-62-6 Propionic Anhydride

123-72-8 n-Butyraldehyde

123-86-4 n-Butyl Acetate

123-91-1 1,4-Dioxane

123-92-2 Isoamyl Acetate

124-40-3 Dimethylamine

126-99-8 Chloroprene

138-86-3 Dipentene

140-88-5 Ethyl Acrylate (Inhibited)

141-32-2 n-Butyl Acrylate (Inhibited)

141-43-5 Monoethanolamine

141-78-6 Ethyl Acetate

141-97-9 Mesityl Oxide

142-82-5 n-Heptane

143-08-8 Nonyl Alcohol

151-56-4 Ethylenimine

208-87-2 Methylcyclohexane

302-01-2 Hydrazine

463-82-1 Dimethylpropane

463-82-1 Neopentane

534-15-6 Methyl Formal

540-88-5 tert-Butyl Acetate

541-85-5 Ethyl Sec-Amyl Ketone

589-34-4 3-Methylhexane

591-78-6 Hexanone

592-41-6 Hexene

624-83-9 Methyl Isocyanate

626-38-0 sec-Amyl Acetate

627-13-4 Propyl Nitrate

628-63-7 n-Amyl Acetate

630-08-0 Carbon Monoxide

645-62-5 Ethyl-3-Propyl Acrolein

1068-19-5 Methylheptane

1071-26-7 Dimethylheptane

1319-77-3 Cresol

1330-20-7 Xylene

1333-74-0 Hydrogen

1634-04-4 Methyl Tertiary Butyl Ether

2216-32-2 2-Methyloctane




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2425-66-3 1-Chloro-1-Nitropropane

2426-08-6 n-Butyl Glycidyl Ether

2437-56-1 Tridecene

3132-64-7 Epichlorohydrin


4016-14-2 Isopropyl Glycidyl Ether

4170-30-3 Crotonaldehyde

6842-15-5 Dodecene

7664-41-7 Ammonia

7783-06-4 Hydrogen Sulfide

7783-07-5 Hydrogen Selenide

8006-61-9 Gasoline

8006-64-2 Turpentine

8008-20-6 Fuel Oil 1

8008-20-6 Kerosene

8030-30-6 Naphtha (Coal Tar)

8030-30-6 Naphtha (Petroleum)

25013-15-4 Vinyl Toluene

25167-67-3 Butylene

25340-18-5 Triethylbenzene

25377-83-7 Octene

25630-42-3 Methylcyclohexanol

26952-21-6 Isooctyl Alcohol

27214-95-8 Nonene

27846-30-6 Methylacetylene-Propadiene

28761-27-5 Undecene

31394-54-4 Dimethylhexane

31394-54-4 2-Methylhexane

34590-94-8 Dipropylene Glycol Methyl Ether

68476-85-7 Liquefied Petroleum Gas

81624-04-6 Heptene

4.4 5 .4

Annex C lists references that deal with the testing of various characteristics of combustible materials.


This simply moves the requirements from the definitions section, in accordance with the Manual of Style.








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25 of 58 7/9/2014 3:13 PM


Revise 4.1.2 *

In a Class I hazardous (classified) location, the

combustiblecombustible material present is a flammable gas , or vapor flammable liquid produced vapor, or combustible liquidproduced vapor mixed with air that may burn or explode .

4.1.2 *


The current text if read literally conflicts with the stated conditions of the combustible material groups by addressing only flammable gas or vapor. The revised text contains the complete description and agrees with the material Group terms.




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26 of 58 7/9/2014 3:13 PM

Public Input No. 16-NFPA 497-2014 [ Sections 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.1.7 ]

Delete complete Sections 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.1.7

4.1.3

Class I is further subdivided into either Class I, Division 1 or Class I, Division 2; or Class I, Zone 0, Zone 1, or Zone 2 asdetailed in 4.1.3.1 through 4.1.3.5.

4.1.3.1 Class I, Division 1.


(1) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors can exist under normal operating conditions, or


(3) In which breakdown or faulty operation of equipment or processes might release ignitible concentrations of flammablegases, flammable liquid–produced vapors, or combustible liquid–produced vapors and might also cause simultaneousfailure of electrical equipment in such a way as to directly cause the electrical equipment to become a source of ignition.[70:500.5(B)(1)]

4.1.3.2 Class I, Division 2.


(1) In which volatile flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors arehandled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containersor closed systems from which they can escape only in case of accidental rupture or breakdown of such containers orsystems or in case of abnormal operation of equipment, or

(2) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors are normally prevented by positive mechanical ventilation and which might become hazardous throughfailure or abnormal operation of the ventilating equipment, or

(3) That is adjacent to a Class I, Division 1 location, and to which ignitible concentrations of flammable gases, flammableliquid–produced vapors, or combustible liquid–produced vapors above their flash points might occasionally becommunicated unless such communication is prevented by adequate positive-pressure ventilation from a source of cleanair and effective safeguards against ventilation failure are provided.

[70:500.5(B)(2)]


A Class I, Zone 0 location is a location in which







(3) In which equipment is operated or processes are carried on, of such a nature that equipment breakdown or faultyoperations could result in the release of ignitible concentrations of flammable gases or vapors and also causesimultaneous failure of electrical equipment in a mode to cause the electrical equipment to become a source of ignition;or

(4) That is adjacent to a Class I, Zone 0 location from which ignitible concentrations of vapors could be communicated,unless communication is prevented by adequate positive pressure ventilation from a source of clean air and effectivesafeguards against ventilation failure are provided. [70:505.5(B)(2)]


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(2) In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in whichthe liquids, gases, or vapors normally are confined within closed containers of closed systems from which they canescape only as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormaloperation of the equipment with which the liquids or gases are handled, processed, or used; or


(4) That is adjacent to a Class I, Zone 1 location, from which ignitible concentrations of flammable gases or vapors could becommunicated, unless such communication is prevented by adequate positive-pressure ventilation from a source ofclean air and effective safeguards against ventilation failure are provided. [70:505.5(B)(3)]

4.1.4

The intent of Articles 500 and 505 of the NEC is to prevent combustible material from being ignited by electrical equipmentand wiring systems.

4.1.5

Electrical installations within hazardous (classified) locations can use various protection techniques. No single protectiontechnique is best in all respects for all types of equipment used in a chemical plant.

4.1.5.1

Explosionproof enclosures, pressurized equipment, and intrinsically safe circuits are applicable to both Division 1 and Division2 locations.

4.1.5.2

Nonincendive equipment is permitted in Division 2 locations.

4.1.5.3*

Portable electronic products (PEPs) meeting the requirements for PEP-1 or PEP-2 of ANSI/ISA-RP12.12.03 RecommendedPractice for Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I, Zone 2, and Class III, Division 1and 2 Hazardous (Classified) Locations, are considered suitable for use in Division 2 and Zone 2 locations.

4.1.5.4

Nonsparking electrical equipment and other less restrictive equipment, as specified in the NEC, are permitted in Division 2locations.

4.1.6

Factors such as corrosion, weather, maintenance, equipment standardization and interchangeability, and possible processchanges or expansion frequently dictate the use of special enclosures or installations for electrical systems. However, suchfactors are outside the scope of this recommended practice, which is concerned entirely with the proper application ofelectrical equipment to avoid ignition of combustible materials.

4.1.7

For the purpose of this recommended practice, areas not classified as Class I, Division 1; Class I, Division 2: or as Class I,Zone 0, Zone 1, or Zone 2, are “unclassified” areas.


These sections address Classification of Class I locations and not Classification of combustible materials. Therefore this mateiral does not belong in this section and should be removed. (Another proposal will place similar texts in the more appropriate section of this code).




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28 of 58 7/9/2014 3:13 PM

Public Input No. 17-NFPA 497-2014 [ New Section after 4.2 ]

TITLE OF NEW CONTENT

New 4.2 and 4.3 as shown and revise existing numbering accordingly

Remove 4.4 and 4.4.1

Renumber 4.4.2 as 4.3.4 * as shown-

4.2* (former 3.3.5.1*) Combustible Material (Class I, Division). Class I, Division combustible materials are divided intoGroups A, B, C, and D.

4.2.1 (former 3.3.5.1.1) Group A. Acetylene.

4.2.2 (former 3.3.5.1.2) Group B. Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapormixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value less than or equal to0.45mmor a minimum igniting current ratio (MIC ratio) less than or equal to 0.40. Note: Atypical Class I, Group B material ishydrogen.

4.2.3 (former 3.3.5.1.3) Group C. Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapormixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.45 mmand less than or equal to 0.75 mm, or a minimum igniting current ratio (MIC) ratio greater than 0.40 and less than or equal to0.80. Note: A typical Class I, Group C material is ethylene.

4.2.4 (former 3.3.5.1.4) Group D. Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapormixed with air that may burn or explode, having either a

maximum experimental safe gap (MESG) value greater than 0.75 mm or a minimum igniting current (MIC) ratio greater than0.80. Note: A typical Class I, Group D material is propane.

4.3* (former 3.3.5.2*) Combustible Material (Class I, Zone). Class I, Zone combustible materials are divided into Groups IIC,IIB, and IIA.

4.3.1 (former 3.3.5.2.1) Group IIA. Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, orflammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn orexplode, having either a maximum experimental safe gap (MESG) value greater than 0.90 mm or minimum igniting currentratio (MIC ratio) greater than 0.80.

4.3.2 (former 3.3.5.2.2) Group IIB. Atmospheres containing acetaldehyde, ethylene, or flammable gas, flammable liquidproduced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either maximumexperimental safe gap (MESG) values greater than 0.50 mm and less than or equal to 0.90 mm or minimum igniting currentratio (MIC ratio) greater than 0.45 and less than or equal to 0.80.

4.3.3 (former 3.3.5.2.3) Group IIC. Atmospheres containing acetylene, hydrogen, or flammable gas, flammable liquid-produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximumexperimental safe gap (MESG) value less than or equal to 0.50 mm or minimum igniting current ratio (MIC ratio) less than orequal to 0.45.

4.3.4 * An alphabetical listing of selected combustible materials, with their group classification and relevant physicalproperties, is provided in Table 4.3.4 ( former Table 4.4.2).


Chapter 4 deals with the Classification of Combustible Materials and the text added to this section use existing texts that address this important subjet material.




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30 of 58 7/9/2014 3:13 PM

4.4.2*


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Table 4.4.2 Selected Chemicals


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Acetaldehyde 75-07-0 Cd I -38 175 4.0 60.0 1.5 874.9 IIA 0.37 0.98 0.92

Acetic Acid 64-19-7 Dd II 39 426 19.9 2.1 15.6 IIA 2.67 1.76

Acetic Acid-



Acetone 67-64-1 Dd I –20 465 2.5 12.8 2.0 230.7 IIA 1.15 1.00 1.02



Acetylene 74-86-2 Ad GAS 305 2.5 100 0.9 36600 IIC 0.017 0.28 0.25

Acrolein (Inhibited) 107-02-8 B(C)d I 235 2.8 31.0 1.9 274.1 IIB 0.13


Acrylonitrile 107-13-1 Dd I 0 481 3 17 1.8 108.5 IIB 0.16 0.78 0.87


Allyl Alcohol 107-18-6 Cd I 22 378 2.5 18.0 2.0 25.4 IIB 0.84


Allyl Glycidyl Ether 106-92-3 B(C)e II 57 3.9




Ammonia 7664-41-7 Dd,f GAS 651 15 28 0.6 7498.0 IIA 680 6.85 3.17


Benzene 71-43-2 Dd I -11 498 1.2 7.8 2.8 94.8 IIA 0.20 1.00 0.99


Bromopropyne 106-96-7 D I 10 324 3.0

n-Butane 106-97-8 Dd,g GAS 288 1.9 8.5 2.0 IIA 0.25 0.94 1.07

1,3-Butadiene 106-99-0 B(D)d,e GAS 420 2.0 11.5 1.9 IIB 0.13 0.76 0.79

1-Butanol 71-36-3 Dd I 36 343 1.4 11.2 2.6 7.0 IIA 0.91


78-92-2 Dd I 23.8 405 1.7 9.8 2.6 IIA


Butylene 25167-67-3 D I 385 1.6 10.0 1.9 2214.6 IIA 0.94

n-Butyraldehyde 123-72-8 Cd I -12 218 1.9 12.5 2.5 112.2 IIA 0.92

n-Butyl Acetate 123-86-4 Dd I 22 421 1.7 7.6 4.0 11.5 IIA 1.08 1.04




141-32-2 D II 49 293 1.7 9.9 4.4 5.5 IIB 0.88

n-Butyl Glycidyl Ether 2426-08-6 B(C)e II





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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)


n-Butyric Acid 107-92-6 Dd IIIA 72 443 2.0 10.0 3.0 0.8


Carbon Monoxide 630-08-0 Cd GAS 609 12.5 74 0.97 IIB 0.54



1-Chloro-1-



Cresol 1319-77-3 D IIIA 81 559 1.1 3.7

Crotonaldehyde 4170-30-3 Cd I 13 232 2.1 15.5 2.4 33.1 IIB 0.81

Cumene 98-82-8 D I 36 424 0.9 6.5 4.1 4.6 IIA 1.05





Cyclopropane 75-19-4 Dd I 503 2.4 10.4 1.5 5430 IIA 0.17 0.84 0.91

p-Cymene 99-87-6 D II 47 436 0.7 5.6 4.6 1.5 IIA

Decene 872-05-9 D II 235 4.8 1.7


n-Decanol 112-30-1 D IIIA 82 288 5.3 0.008



Di-Isobutylene 25167-70-8 Dd I 2 391 0.8 4.8 3.8 0.96




3583-47-9 Dd I 1.9 8.5 2.0 IIA 0.25 0.98 1.07



1,1-Dichloro-1-




Diethylamine 109-87-9 Cd I -28 312 1.8 10.1 2.5 IIA 1.15




60-29-7 Cd I -45 160 1.9 36 2.6 538 IIB 0.19 0.88 0.83


112-34-5 C IIIA 78 228 0.9 24.6 5.6 0.02


111-77-3 C IIIA 93 241 0.2





2,2-Dimethylbutane 75-83-2 Dg I -48 405 319.3


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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

2,3-Dimethylbutane 78-29-8 Dg I 396

3,3-Dimethylheptane 1071-26-7 Dg I 325 10.8

2,3-Dimethylhexane 31394-54-4 Dg I 438

2,3-Dimethylpentane 107-83-5 Dg I 335 211.7


1,4-Dioxane 123-91-1 Cd I 12 180 2.0 22.0 3.0 38.2 IIB 0.19 0.70



34590-94-8 C IIIA 85 1.1 3.0 5.1 0.5


Dodecene 6842-15-5 D IIIA 100 255

Epichlorohydrin 3132-64-7 Cd I 33 411 3.8 21.0 3.2 13.0

Ethane 74-84-0 Dd GAS -29 472 3.0 12.5 1.0 IIA 0.24 0.82 0.91

Ethanol 64-17-5 Dd I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89

Ethylamine 75-04-7 Dd I -18 385 3.5 14.0 1.6 1048 2.4

Ethylene 74-85-1 Cd GAS 490 2.7 36.0 1.0 IIB 0.070 0.53 0.65

Ethylenediamine 107-15-3 Dd I 33 385 2.5 12.0 2.1 12.5

Ethylenimine 151-56-4 Cd I -11 320 3.3 54.8 1.5 211 0.48


Ethylene Dichloride 107-06-2 Dd I 13 413 6.2 16.0 3.4 79.7


111-15-9 C II 47 379 1.7 4.7 2.3 IIA 0.53 0.97


112-07-2 C IIIA 340 0.9 8.5 0.9


111-76-2 C IIIA 238 1.1 12.7 4.1 1.0


110-80-5 C II 235 1.7 15.6 3.0 5.4 0.84


109-86-4 D II 285 1.8 14.0 2.6 9.2 0.85

Ethylene Oxide 75-21-8 B(C)d,e I -20 429 3 100 1.5 1314 IIB 0.065 0.47 0.59




Ethyl Acetate 141-78-6 Dd I -4 427 2.0 11.5 3.0 93.2 IIA 0.46 0.99


140-88-5 Dd I 9 372 1.4 14.0 3.5 37.5 IIA 0.86

Ethyl Alcohol 64-17-5 Dd I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89


Ethyl Benzene 100-41-4 D I 15 432 0.8 6.7 3.7 9.6






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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Ethyl Mercaptan 75-08-1 Cd I -18 300 2.8 18.0 2.1 527.4 IIB 0.90 0.90



645-62-5 C IIIA 68 4.4





IIIAk 38–72k 210 0.7 5.0

Fuel Oil 2II or

IIIAk 52–96k 257

Fuel Oil 6IIIA or

IIIBk 66–132k

Furfural 98-01-1 C IIIA 60 316 2.1 19.3 3.3 2.3 0.94


Gasoline 8006-61-9 Dd I -46 280 1.4 7.6 3.0

n-Heptane 142-82-5 Dd I -4 204 1.0 6.7 3.5 45.5 IIA 0.24 0.88 0.91

n-Heptene 81624-04-6 Dg I -1 204 3.4 0.97

n-Hexane 110-54-3 Dd,g I -23 225 1.1 7.5 3.0 152 IIA 0.24 0.88 0.93


2-Hexanone 591-78-6 D I 35 424 1.2 8.0 3.5 10.6

Hexene 592-41-6 D I -26 245 1.2 6.9 186


Hydrazine 302-01-2 C II 38 23 98.0 1.1 14.4

Hydrogen 1333-74-0 Bd GAS 500 4 75 0.1 IIC 0.019 0.25 0.28

Hydrogen Cyanide 74-90-8 Cd GAS -18 538 5.6 40.0 0.9 IIB 0.80


Hydrogen Sulfide 7783-06-4 Cd GAS 260 4.0 44.0 1.2 IIB 0.068 0.90



Isobutane 75-28-5 Dg GAS 460 1.8 8.4 2.0 IIA 0.95

Isobutyl Acetate 110-19-0 Dd I 18 421 2.4 10.5 4.0 17.8


Isobutyl Alcohol 78-83-1 Dd I -40 416 1.2 10.9 2.5 10.5 IIA 0.92 0.98



Isohexane 107-83-5 Dg 264 211.7 IIA 1.00

Isopentane 78-78-4 Dg 420 688.6


Isophorone 78-59-1 D 84 460 0.8 3.8 4.8 0.4

Isoprene 78-79-5 Dd I -54 220 1.5 8.9 2.4 550.6


Isopropyl Ether 108-20-3 Dd I -28 443 1.4 7.9 3.5 148.7 IIA 1.14 0.94


4016-14-2 C I


35 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)


Kerosene 8008-20-6 D II 72 210 0.7 5.0 IIA


68476-85-7 D I 405

Mesityl Oxide 141-97-9 Dd I 31 344 1.4 7.2 3.4 47.6

Methane 74-82-8 Dd GAS 600 5 15 0.6 IIA 0.28 1.00 1.12

Methanol 67-56-1 Dd I 12 385 6.0 36.0 1.1 126.3 IIA 0.14 0.82 0.92



Methyl Alcohol 67-56-1 Dd I 385 6.0 36 1.1 126.3 IIA 0.91



Methyl Ether 115-10-6 Cd GAS -41 350 3.4 27.0 1.6 IIB 0.85 0.84

Methyl Ethyl Ketone 78-93-3 Dd I -6 404 1.4 11.4 2.5 92.4 IIB IIA 0.53 0.92 0.84 92

Methyl Formal 534-15-6 Cd I 1 238 3.1


2-Methylhexane 31394-54-4 Dg I 280

Methyl Isobutyl Ketone 108-10-1 Dd I 13 440 1.2 8.0 3.5 11






1634-04-4 D I -80 435 1.6 8.4 0.2 250.1

2-Methyloctane 3221-61-2 220 6.3


Methyl-1-Propanol 78-83-1 Dd I -40 416 1.2 10.9 2.5 10.1 IIA 0.98

Methyl-2-Propanol 75-65-0 Dd I 10 360 2.4 8.0 2.6 42.2


104-90-5 D 74 1.1 6.6 4.2

Methylacetylene 74-99-7 Cd I 1.7 1.4 4306 0.11

Methylacetylene-


Methylal 109-87-5 C I -18 237 1.6 17.6 2.6 398


2-Methylbutane 78-78-4 Dg -56 420 1.4 8.3 2.6 688.6




2-Methylheptane Dg 420

3-Methylhexane 589-34-4 Dg 280 61.5

3-Methylpentane 94-14-0 Dg 278


2-Methyl-1-Propanol 78-83-1 Dd I -40 223 1.2 10.9 2.5 10.5


36 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

2-Methyl-2-Propanol 75-65-0 Dd I 478 2.4 8.0 2.6 42.2

2-Methyloctane 2216-32-2 Dg 220







Morpholine 110-91-8 Cd II 35 310 1.4 11.2 3.0 10.1 IIA 0.95


Naphtha (Petroleum) 8030-30-6 Dd,i I 42 288 1.1 5.9 2.5 IIA

Neopentane 463-82-1 Dg -65 450 1.4 8.3 2.6 1286





2-Nitropropane 79-46-9 Cd I 28 428 2.6 11.0 3.1 17.1

n-Nonane 111-84-2 Dg I 31 205 0.8 2.9 4.4 4.4 IIA

Nonene 27214-95-8 D I 0.8 4.4


n-Octane 111-65-9 Dd,g I 13 206 1.0 6.5 3.9 14.0 IIA 0.94

Octene 25377-83-7 D I 8 230 0.9 3.9


n-Pentane 109-66-0 Dd,g I -40 243 1.5 7.8 2.5 513 IIA 0.28 0.97 0.93

1-Pentanol 71-41-0 Dd I 33 300 1.2 10.0 3.0 2.5 IIA 1.30

2-Pentanone 107-87-9 D I 7 452 1.5 8.2 3.0 35.6 IIA 0.99

1-Pentene 109-67-1 D I -18 275 1.5 8.7 2.4 639.7

2-Pentene 109-68-2 D I -18 2.4



Process Gas > 30%H2

Bj GAS 520 4.0 75.0 0.1 0.019 0.45

Propane 74-98-6 Dd GAS 450 2.1 9.5 1.6 IIA 0.25 0.82 0.97

1-Propanol 71-23-8 Dd I 15 413 2.2 13.7 2.1 20.7 IIA 0.89

2-Propanol 67-63-0 Dd I 12 399 2.0 12.7 2.1 45.4 IIA 0.65 1.00






n-Propyl Ether 111-43-3 Cd I 21 215 1.3 7.0 3.5 62.3

Propyl Nitrate 627-13-4 Bd I 20 175 2.0 100.0

Propylene 115-07-1 Dd GAS 460 2.4 10.3 1.5 IIA 0.28 0.91



37 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressureb

(mm Hg)

Class IZone

Groupc

MIE(mJ)

MICRatio

MESG(mm)

Propylene Oxide 75-56-9 B(C)d,e I -37 449 2.3 36.0 2.0 534.4 IIB 0.13 0.70

Pyridine 110-86-1 Dd I 20 482 1.8 12.4 2.7 20.8 IIA

Styrene 100-42-5 Dd I 31 490 0.9 6.8 3.6 6.1 IIA 1.21

Tetrahydrofuran 109-99-9 Cd I -14 321 2.0 11.8 2.5 161.6 IIB 0.54 0.87



Toluene 108-88-3 Dd I 4 480 1.1 7.1 3.1 28.53 IIA 0.24


Triethylamine 121-44-8 Cd I -9 249 1.2 8.0 3.5 68.5 IIA 0.75 1.05





2,2,4-Trimethylpentane Dg 415 IIA 1.04



Turpentine 8006-64-2 D I 35 253 0.8 4.8

n-Undecene 28761-27-5 D IIIA 0.7 5.5


57-14-7 Cd I -15 249 2.0 95.0 1.9 IIB 0.85


Vinyl Acetate 108-05-4 Dd I -6 402 2.6 13.4 3.0 113.4 IIA 0.70 0.94

Vinyl Chloride 75-01-4 Dd GAS -78 472 3.6 33.0 2.2 IIA 0.96

Vinyl Toluene 25013-15-4 D 52 494 0.8 11.0 4.1


Xylene 1330-20-7 Dd I 25 464 0.9 7.0 3.7 IIA 0.2 1.09

Xylidine 121-69-7 C IIIA 63 371 1.0 4.2 0.7






fFor classification of areas involving ammonia, see ASHRAE 15, Safety Code for Mechanical Refrigeration, and ANSI/CGAG2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia.





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497-2012_Document_Proposal.doc Detailed proposals including and beyond my on-line mark ups.


Proposal 1:Clause 3.3.5.2 does not properly distinguish, in cases where MESG and MIC ratio can result in different Group classifications, the proper application of these parameters. This can result in incorrect or unduly conservative Group classifications.

Proposal 2:The MESG value is based on outdated research, and the Group classification is unduly conservative. Both can result in uneconomic overdesign for equipment intended for use with MEK.

For substantiation, see supporting material: seven page document titled "497-2012 Document Proposal.doc".


Submitter Full Name: Michael Sherman

Organization: Graco Inc.

Street Address:

City:

State:

Zip:

Submittal Date: Fri Jun 06 16:31:13 EDT 2014


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497-2012 Document Proposal 7 July 2014 Mike Sherman, Graco Inc. [email protected] This document expands on the proposal I submitted on 6 June 2014. Proposals

1. Add guidance for when MESG and MIC ratios can allow two different Group classifications. a. Add to clause 3.3.5.2 the following sentence:

“Where the MESG and MIC ratio values allow two different Group classifications: equipment solely relying upon the protection concept of flameproof (explosion proof) must use the MESG value to determine the Group; and equipment solely relying upon the protection concept of intrinsic safety must use the MIC ratio to determine the Group.”

b. Table 4.4.2, page 497-12, in the entry for Methyl Ethyl Ketone (MEK), CAS 78-93-3, in the Class I Zone Group column: add “IIA” with a footnote “Group IIA is allowed if the equipment solely relies upon the protection concept of intrinsic safety.”

2. In Table 4.4.2, page 497-12, in the entry for Methyl Ethyl Ketone (MEK), CAS 78-93-3: a. Change the MESG value from 0.84 to 0.92. b. Change the Class I Zone Group from IIB to IIA.

Problem Statement Proposal 1: Clause 3.3.5.2 does not properly distinguish, in cases where MESG and MIC ratio can result in different Group classifications, the proper application of these parameters. This can result in incorrect or unduly conservative Group classifications. Proposal 2: The MESG value is based on outdated research, and the Group classification is unduly conservative. Both can result in uneconomic overdesign for equipment intended for use with MEK. A. Proposal 1 Reason: 3.3.5.2. and Table 4.4.2 Group and footnote changes Although MESG and MIC ratio values have been scaled to result in similar numbers for a given vapor, they are not interchangeable. MESG is fundamentally liked to design of flameproof (explosion proof) enclosures and is the appropriate parameter when the equipment design relies solely upon this protection concept. Likewise, MIC ratio is fundamentally linked to intrinsic safety designs and is the appropriate parameter when the equipment design relies solely upon this protection concept.

mailto:[email protected]

Page 2 of 7

B. Proposal 2 Reason: MEK MESG value change 1. Immediate Origin of NFPA 497 Values: IEC 60079-20-1 Annex B Footnote c to Table 4.4.2 refers to 1996 IEC TR3 60079-20, Electrical apparatus for explosive gas atmospheres---Part 20: Date for flammable gases and vapours, relating to the use of electrical apparatus, as the source for the Class I Zone Groups and for additional data on MESG and group classifications. In 2010, IEC 60079-20-1:2010, Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data, was released. The IEC web site (http://webstore.iec.ch/webstore/webstore.nsf/artnum/043706!opendocument) states: “This first edition of IEC 60079-20-1 cancels and replaces…and the first edition of IEC 60079-20 (1996).” In February 2010, CENELEC approved IEC 60079-20-1:2010 without any modification, but with the addition of annexes ZA and ZZ, as EN 60079-20-1:2010. Because of this equivalency, all the citations in this proposal will be from EN 60079-20-1:2010, hereinafter referred to as 60079-20-1. Informative Annex B of 60079-20-1 lists MEK with an MESG of 0.84, an equipment group of IIB, and a “method of classification” of “a,” meaning it was classified according to MESG determination. Conclusion from 60079-20-1: the current values of 497-2012 are consistent with the current values of 60079-20-1.

Page 3 of 7

2. Origin of 60079-20-1 Values: Bibliography of Annex B and NMAB-447 The introduction to 60079-20-1 Annex B states: “Data are subject to revision and, where more recent information is required, the use of a maintained database6 is recommended.” Footnote 6 states: “For information on the availability of maintained databases refer to Bibliography.” Reference f) in the Bibliography is NMAB-447, 1987. Washington DC, USA. (Maximum experimental safe gap, apparatus groups). This paper can be found at (http://books.google.com/books?id=hUorAAAAYAAJ&pg=PR1&lpg=PR1&dq=NMAB-447,+1987.&source=bl&ots=CyOTJrRfNH&sig=VfPaTaJGOzOe2Wd7IMzOcMU_LQg&hl=en&sa=X&ei=jVOOU6PSDoiZqAaHloHYDw&ved=0CCIQ6AEwAQ#v=onepage&q=NMAB-447%2C%201987.&f=false). At the bottom of page 96 of NMAB-447, in a Harry Phillips paper, two values for butanone (MEK) are given:

The 0.92 value has references 1 and 2 to a 20-ml PTB vessel, reproduced below.

The 0.84 value has a reference 34 to an 8 L SMRE Buxton vessel, reproduced below.

Conclusions from NMAB-447:

1. The 0.92 value can be traced back to PTB values obtained in 1968 and 1969 on a 20-ml vessel, which is what 60079-20-1 specifies in its Clause 6.

2. The 0.84 value in 60079-20-1 can be traced back to SMRE values obtained in 1953 in an 8 L vessel.

Page 4 of 7

3. Other Research Supporting 0.92 Value: G .A. Lunn, 1982 The Harry Phillips paper in NMAB-447 extensively cites some 1982 work of G.A. Lunn in its reference 4:

In TABLE 1 on page 336 of this 1982 G.A. Lunn article, ketones are listed, including a “2-Butane” that is a typographic misspelling of 2-butanone (MEK). It lists the MESG as 0.92. It also lists the Group as IIA:

In the same issue of the Journal of Hazardous Materials, 6 (1982) 341-359, G.A. Lunn published an article titled “The Influence of chemical structure and combustion reactions on the maximum experimental safe gap of industrial gases and liquids.” On page 344 of this article, 2-Butanone is correctly spelled and the value of 0.92 and classification of group IIA are repeated:

Page 5 of 7

This is reinforced by a summary statement on page 356 of this paper, in which G.A. Lunn states that all ketones with saturated carbon chains, with one exception, can be classified as Group IIA:

Page 6 of 7

Conclusions from G.A. Lunn 1982 papers: 1. The 8 L vessel used in 1953 by SMRE to obtain the 0.84 value was considered obsolete by SMRE

as early as 1981, when the G.A. Lunn article was submitted for publication. 2. The 20-ml vessel used by SMRE obtained a value of 0.92. 3. This value is supported by the similarity of chemical structure with other ketones. 4. The value of 0.92 was published in two articles in a 1982 issue of Journal of Hazardous Materials.

4. Summary Reasoning for Changing MESG from 0.84 to 0.92:

1. NFPA 497 cites 60079-20-1 as its source for MESG. 2. 60079-20-1 Annex B Bibliography cites NMAB-447. 3. NMAB-447 shows 1953 SMRE testing in an 8 L vessel as the source for the 0.84 value. 4. NMAB-447 also shows1968/69 PTB testing in a 20-ml vessel, resulting in a 0.92 value. 5. SMRE published a value of 0.92 in 1982 based on a 20-ml vessel. 6. Because 60079-20-1 clause 6 cites a 20-ml vessel, the values it cites in Annex B should be based

on 20-ml test data, not 8 L test data. 7. The value of 0.92 is consistent with ketone chemical structure.

C. Proposal 2 Reason: MEK Group change 1. MIC ratio According to clause 3.3.5.2.1 of 497-2012, a material “…having either a maximum experimental safe gap (MESG) value greater than 0.90 mm or minimum igniting current ratio (MIC ratio) greater than 0.80” can be classified as Group IIA. Note: the MIC ratio in NFPA 497 Table 4.4.2 is 0.92, which is greater than 0.80, and therefore qualifies this as Group IIA. 2. MESG value change If the committee accepts the change in MESG from 0.84 to 0.92, then MEK meets both of the either/or criteria of clause 3.3.5.2.1 and Group IIA is the only logical choice. 3. G.A. Lunn 1982 research The G.A. Lunn research published in 1982 and summarized in section A.3 above clearly shows that IIA is the appropriate classification based both on testing and on chemical structure.

Page 7 of 7

Other observations: methyl acrylate Methyl Acrylate, CAS 96-33-3, is similar to MEK in that Table 4.4.2 shows an MESG <0.9, an MIC ratio >0.9, and a group of IIB. I have not researched the testing behind the MESG and MIC ratio values, and so have no current recommendation regarding changing them. However, by the logic presented earlier in this proposal, assuming these MESG and MIC ratio values are accurate, one could classify methyl acrylate as group IIA according to clause 3.3.5.2.1, but one might want to think closely about the intended method of protection before doing so.



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4.4.2 *


41 of 58 7/9/2014 3:13 PM


Table 4.4.2 Selected Chemicals


DivisionGroup

Type aFlashPoint(°C)

AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)

Acetaldehyde 75-07-0 C d I -38 175 4.0 60.0 1.5 874.9 IIA 0.37 0.98 0.92

Acetic Acid 64-19-7 D d II 39 426 19.9 2.1 15.6 IIA 2.67 1.76

Acetic Acid-



Acetone 67-64-1 D d I –20 465 2.5 12.8 2.0 230.7 IIA 1.15 1.00 1.02



Acetylene 74-86-2 A d GAS 305 2.5 100 0.9 36600 IIC 0.017 0.28 0.25

Acrolein (Inhibited) 107-02-8 B(C) d I 235 2.8 31.0 1.9 274.1 IIB 0.13


Acrylonitrile 107-13-1 D d I 0 481 3 17 1.8 108.5 IIB 0.16 0.78 0.87


Allyl Alcohol 107-18-6 C d I 22 378 2.5 18.0 2.0 25.4 IIB 0.84


Allyl Glycidyl Ether 106-92-3 B(C) e II 57 3.9




Ammonia 7664-41-7 D d,f GAS 651 15 28 0.6 7498.0 IIA 680 6.85 3.17


Benzene 71-43-2 D d I -11 498 1.2 7.8 2.8 94.8 IIA 0.20 1.00 0.99


Bromopropyne 106-96-7 D I 10 324 3.0

n-Butane 106-97-8 D d,g GAS 288 1.9 8.5 2.0 IIA 0.25 0.94 1.07

1,3-Butadiene 106-99-0 B(D) d,e GAS 420 2.0 11.5 1.9 IIB 0.13 0.76 0.79

1-Butanol 71-36-3 D d I 36 343 1.4 11.2 2.6 7.0 IIA 0.91


78-92-2 D d I 23.8 405 1.7 9.8 2.6 IIA


Butylene 25167-67-3 D I 385 1.6 10.0 1.9 2214.6 IIA 0.94

n-Butyraldehyde 123-72-8 C d I -12 218 1.9 12.5 2.5 112.2 IIA 0.92

n-Butyl Acetate 123-86-4 D d I 22 421 1.7 7.6 4.0 11.5 IIA 1.08 1.04




141-32-2 D II 49 293 1.7 9.9 4.4 5.5 IIB 0.88

n-Butyl Glycidyl Ether 2426-08-6 B(C) e II





42 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)


n-Butyric Acid 107-92-6 D d IIIA 72 443 2.0 10.0 3.0 0.8


Carbon Monoxide 630-08-0 C d GAS 609 12.5 74 0.97 IIB 0.54



1-Chloro-1-



Cresol 1319-77-3 D IIIA 81 559 1.1 3.7

Crotonaldehyde 4170-30-3 C d I 13 232 2.1 15.5 2.4 33.1 IIB 0.81

Cumene 98-82-8 D I 36 424 0.9 6.5 4.1 4.6 IIA 1.05





Cyclopropane 75-19-4 D d I 503 2.4 10.4 1.5 5430 IIA 0.17 0.84 0.91

p-Cymene 99-87-6 D II 47 436 0.7 5.6 4.6 1.5 IIA

Decene 872-05-9 D II 235 4.8 1.7


n-Decanol 112-30-1 D IIIA 82 288 5.3 0.008



Di-Isobutylene 25167-70-8 D d I 2 391 0.8 4.8 3.8 0.96




3583-47-9 D d I 1.9 8.5 2.0 IIA 0.25 0.98 1.07



1,1-Dichloro-1-




Diethylamine 109-87-9 C d I -28 312 1.8 10.1 2.5 IIA 1.15




60-29-7 C d I -45 160 1.9 36 2.6 538 IIB 0.19 0.88 0.83


112-34-5 C IIIA 78 228 0.9 24.6 5.6 0.02


111-77-3 C IIIA 93 241 0.2





2,2-Dimethylbutane 75-83-2 D g I -48 405 319.3


43 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)

2,3-Dimethylbutane 78-29-8 D g I 396

3,3-Dimethylheptane 1071-26-7 D g I 325 10.8

2,3-Dimethylhexane 31394-54-4 D g I 438

2,3-Dimethylpentane 107-83-5 D g I 335 211.7


1,4-Dioxane 123-91-1 C d I 12 180 2.0 22.0 3.0 38.2 IIB 0.19 0.70



34590-94-8 C IIIA 85 1.1 3.0 5.1 0.5


Dodecene 6842-15-5 D IIIA 100 255

Epichlorohydrin 3132-64-7 C d I 33 411 3.8 21.0 3.2 13.0

Ethane 74-84-0 D d GAS -29 472 3.0 12.5 1.0 IIA 0.24 0.82 0.91

Ethanol 64-17-5 D d I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89

Ethylamine 75-04-7 D d I -18 385 3.5 14.0 1.6 1048 2.4

Ethylene 74-85-1 C d GAS 490 2.7 36.0 1.0 IIB 0.070 0.53 0.65

Ethylenediamine 107-15-3 D d I 33 385 2.5 12.0 2.1 12.5

Ethylenimine 151-56-4 C d I -11 320 3.3 54.8 1.5 211 0.48


Ethylene Dichloride 107-06-2 D d I 13 413 6.2 16.0 3.4 79.7


111-15-9 C II 47 379 1.7 4.7 2.3 IIA 0.53 0.97


112-07-2 C IIIA 340 0.9 8.5 0.9


111-76-2 C IIIA 238 1.1 12.7 4.1 1.0


110-80-5 C II 235 1.7 15.6 3.0 5.4 0.84


109-86-4 D II 285 1.8 14.0 2.6 9.2 0.85

Ethylene Oxide 75-21-8 B(C) d,e I -20 429 3 100 1.5 1314 IIB 0.065 0.47 0.59




Ethyl Acetate 141-78-6 D d I -4 427 2.0 11.5 3.0 93.2 IIA 0.46 0.99


140-88-5 D d I 9 372 1.4 14.0 3.5 37.5 IIA 0.86

Ethyl Alcohol 64-17-5 D d I 13 363 3.3 19.0 1.6 59.5 IIA 0.88 0.89


Ethyl Benzene 100-41-4 D I 15 432 0.8 6.7 3.7 9.6






44 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)

Ethyl Mercaptan 75-08-1 C d I -18 300 2.8 18.0 2.1 527.4 IIB 0.90 0.90



645-62-5 C IIIA 68 4.4





IIIA k 38–72 k 210 0.7 5.0

Fuel Oil 2II or

IIIA k 52–96 k 257

Fuel Oil 6IIIA or

IIIB k 66–132 k

Furfural 98-01-1 C IIIA 60 316 2.1 19.3 3.3 2.3 0.94


Gasoline 8006-61-9 D d I -46 280 1.4 7.6 3.0

n-Heptane 142-82-5 D d I -4 204 1.0 6.7 3.5 45.5 IIA 0.24 0.88 0.91

n-Heptene 81624-04-6 D g I -1 204 3.4 0.97

n-Hexane 110-54-3 D d,g I -23 225 1.1 7.5 3.0 152 IIA 0.24 0.88 0.93


2-Hexanone 591-78-6 D I 35 424 1.2 8.0 3.5 10.6

Hexene 592-41-6 D I -26 245 1.2 6.9 186


Hydrazine 302-01-2 C II 38 23 98.0 1.1 14.4

Hydrogen 1333-74-0 B d GAS 500 4 75 0.1 IIC 0.019 0.25 0.28

Hydrogen Cyanide 74-90-8 C d GAS -18 538 5.6 40.0 0.9 IIB 0.80


Hydrogen Sulfide 7783-06-4 C d GAS 260 4.0 44.0 1.2 IIB 0.068 0.90



Isobutane 75-28-5 D g GAS 460 1.8 8.4 2.0 IIA 0.95

Isobutyl Acetate 110-19-0 D d I 18 421 2.4 10.5 4.0 17.8


Isobutyl Alcohol 78-83-1 D d I -40 416 1.2 10.9 2.5 10.5 IIA 0.92 0.98



Isohexane 107-83-5 D g 264 211.7 IIA 1.00

Isopentane 78-78-4 D g 420 688.6


Isophorone 78-59-1 D 84 460 0.8 3.8 4.8 0.4

Isoprene 78-79-5 D d I -54 220 1.5 8.9 2.4 550.6


Isopropyl Ether 108-20-3 D d I -28 443 1.4 7.9 3.5 148.7 IIA 1.14 0.94


4016-14-2 C I


45 of 58 7/9/2014 3:13 PM


DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)


Kerosene 8008-20-6 D II 72 210 0.7 5.0 IIA


68476-85-7 D I 405

Mesityl Oxide 141-97-9 D d I 31 344 1.4 7.2 3.4 47.6

Methane 74-82-8 D d GAS 600 5 15 0.6 IIA 0.28 1.00 1.12

Methanol 67-56-1 D d I 12 385 6.0 36.0 1.1 126.3 IIA 0.14 0.82 0.92



Methyl Alcohol 67-56-1 D d I 385 6.0 36 1.1 126.3 IIA 0.91



Methyl Ether 115-10-6 C d GAS -41 350 3.4 27.0 1.6 IIB 0.85 0.84

Methyl Ethyl Ketone 78-93-3 D d I -6 404 1.4 11.4 2.5 92.4 IIB 0.53 0.92 0.84

Methyl Formal 534-15-6 C d I 1 238 3.1


2-Methylhexane 31394-54-4 D g I 280

Methyl Isobutyl Ketone 108-10-1 D d I 13 440 1.2 8.0 3.5 11






1634-04-4 D I -80 435 1.6 8.4 0.2 250.1

2-Methyloctane 3221-61-2 220 6.3

2-Methylpropane 75-28-5 D g I 460 2639

Methyl-1-Propanol 78-83-1 D d I -40 416 1.2 10.9 2.5 10.1 IIA 0.98

Methyl-2-Propanol 75-65-0 D d I 10 360 2.4 8.0 2.6 42.2


104-90-5 D 74 1.1 6.6 4.2

Methylacetylene 74-99-7 C d I 1.7 1.4 4306 0.11

Methylacetylene-


Methylal 109-87-5 C I -18 237 1.6 17.6 2.6 398


2-Methylbutane 78-78-4 D g -56 420 1.4 8.3 2.6 688.6




2-Methylheptane D g 420

3-Methylhexane 589-34-4 D g 280 61.5

3-Methylpentane 94-14-0 D g 278

2-Methylpropane 75-28-5 D g I 460 2639

2-Methyl-1-Propanol 78-83-1 D d I -40 223 1.2 10.9 2.5 10.5


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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)

2-Methyl-2-Propanol 75-65-0 D d I 478 2.4 8.0 2.6 42.2

2-Methyloctane 2216-32-2 D g 220

3-Methyloctane 2216-33-3 D g 220 6.3

4-Methyloctane 2216-34-4 D g 225 6.8





Morpholine 110-91-8 C d II 35 310 1.4 11.2 3.0 10.1 IIA 0.95


Naphtha (Petroleum) 8030-30-6 D d,i I 42 288 1.1 5.9 2.5 IIA

Neopentane 463-82-1 D g -65 450 1.4 8.3 2.6 1286





2-Nitropropane 79-46-9 C d I 28 428 2.6 11.0 3.1 17.1

n-Nonane 111-84-2 D g I 31 205 0.8 2.9 4.4 4.4 IIA

Nonene 27214-95-8 D I 0.8 4.4


n-Octane 111-65-9 D d,g I 13 206 1.0 6.5 3.9 14.0 IIA 0.94

Octene 25377-83-7 D I 8 230 0.9 3.9


n-Pentane 109-66-0 D d,g I -40 243 1.5 7.8 2.5 513 IIA 0.28 0.97 0.93

1-Pentanol 71-41-0 D d I 33 300 1.2 10.0 3.0 2.5 IIA 1.30

2-Pentanone 107-87-9 D I 7 452 1.5 8.2 3.0 35.6 IIA 0.99

1-Pentene 109-67-1 D I -18 275 1.5 8.7 2.4 639.7

2-Pentene 109-68-2 D I -18 2.4



Process Gas > 30%H 2

B j GAS 520 4.0 75.0 0.1 0.019 0.45

Propane 74-98-6 D d GAS 450 2.1 9.5 1.6 IIA 0.25 0.82 0.97

1-Propanol 71-23-8 D d I 15 413 2.2 13.7 2.1 20.7 IIA 0.89

2-Propanol 67-63-0 D d I 12 399 2.0 12.7 2.1 45.4 IIA 0.65 1.00






n-Propyl Ether 111-43-3 C d I 21 215 1.3 7.0 3.5 62.3

Propyl Nitrate 627-13-4 B d I 20 175 2.0 100.0

Propylene 115-07-1 D d GAS 460 2.4 10.3 1.5 IIA 0.28 0.91



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DivisionGroup


AIT

(°C)%LFL %UFL

VaporDensity(Air =

1)

Vapor

Pressure b

(mm Hg)

Class IZone

Group c

MIE(mJ)

MICRatio

MESG(mm)

Propylene Oxide 75-56-9 B(C) d,e I -37 449 2.3 36.0 2.0 534.4 IIB 0.13 0.70

Pyridine 110-86-1 D d I 20 482 1.8 12.4 2.7 20.8 IIA

Styrene 100-42-5 D d I 31 490 0.9 6.8 3.6 6.1 IIA 1.21

Tetrahydrofuran 109-99-9 C d I -14 321 2.0 11.8 2.5 161.6 IIB 0.54 0.87



Toluene 108-88-3 D d I 4 480 1.1 7.1 3.1 28.53 IIA 0.24


Triethylamine 121-44-8 C d I -9 249 1.2 8.0 3.5 68.5 IIA 0.75 1.05


2,2,3-Trimethylbutane D g 442

2,2,4-Trimethylbutane D g 407

2,2,3-Trimethylpentane D g 396

2,2,4-Trimethylpentane D g 415 IIA 1.04

2,3,3-Trimethylpentane D g 425


Turpentine 8006-64-2 D I 35 253 0.8 4.8

n-Undecene 28761-27-5 D IIIA 0.7 5.5


57-14-7 C d I -15 249 2.0 95.0 1.9 IIB 0.85


Vinyl Acetate 108-05-4 D d I -6 402 2.6 13.4 3.0 113.4 IIA 0.70 0.94

Vinyl Chloride 75-01-4 D d GAS -78 472 3.6 33.0 2.2 IIA 0.96

Vinyl Toluene 25013-15-4 D 52 494 0.8 11.0 4.1


Xylene 1330-20-7 D d I 25 464 0.9 7.0 3.7 IIA 0.2 1.09

Xylidine 121-69-7 C IIIA 63 371 1.0 4.2 0.7






fFor classification of areas involving ammonia, see ASHRAE 15, Safety Code Standard for Mechanical RefrigerationSystems , and ANSI/CGA G2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia.





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Street Address:

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49 of 58 7/9/2014 3:13 PM





FOR OFFICE USE ONLY

Log #:

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NFPA® 497




or Vapors and of


Locations










mmaynard

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1/30/2014



Renumber existing 5.1 accordingly

New 5.1 National Electrical Code

New 5.1.1 (former 4.1.3) Class I is subdivided into either Class I, Division 1 or Class I, Division 2; or Class I, Zone 0, Zone 1,or Zone 2.

5.1.1.1 (former 4.1.3.1) Class I, Division 1. A Class I, Division 1 location is a location

(1) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–producedvapors can exist under normal operating conditions, or


(3) In which breakdown or faulty operation of equipment or processes might release ignitible concentrations of flammablegases, flammable liquid–produced vapors, or combustible liquid–produced vapors and might also cause simultaneous failureof electrical equipment in

such a way as to directly cause the electrical equipment to become a source of ignition. [70:500.5(B)(1)]

5.1.1.2 (former 4.1.3.2) Class I, Division 2. A Class I, Division 2 location is a location

(1) In which volatile flammable gases, flammable liquid– produced vapors, or combustible liquid–produced vapors arehandled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers orclosed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems orin case of abnormal operation of equipment, or

(2) In which ignitible concentrations of flammable gases, flammable liquid–produced vapors, or combustible liquid–producedvapors are normally prevented by positive mechanical ventilation and which might become hazardous through failure orabnormal operation of the ventilating equipment, or

(3) That is adjacent to a Class I, Division 1 location, and to which ignitible concentrations of flammable gases, flammableliquid–produced vapors, or combustible liquid– produced vapors above their flash points might occasionally be communicatedunless such communication is prevented by adequate positive-pressure ventilation from a source of clean air and effectivesafeguards against ventilation failure are provided.

[70:500.5(B)(2)]

5.1.1.3 (former 4.1.3.3) Class I, Zone 0. A Class I, Zone 0 location is a location in which



5.1.1.4 (former 4.1.3.4) Class I, Zone 1. A Class I, Zone 1 location is a location



(3) In which equipment is operated or processes are carried on, of such a nature that equipment breakdown or faultyoperations could result in the release of ignitible concentrations of flammable gases or vapors and also cause simultaneousfailure of electrical equipment in a mode to cause the electrical equipment to become a source of ignition; or

(4) That is adjacent to a Class I, Zone 0 location from which ignitible concentrations of vapors could be communicated, unlesscommunication is prevented by adequate positive pressure ventilation from a source of clean air and effective safeguardsagainst ventilation failure are provided. [70:505.5(B)(2)]

5.1.1.5 (former 4.1.3.5) Class I, Zone 2. A Class I, Zone 2 location is a location


(2) In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in whichthe liquids, gases, or vapors normally are confined within closed containers of closed systems from which they can escapeonly as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormal operation of theequipment with which the liquids or gases are handled, processed, or used; or


(4) That is adjacent to a Class I, Zone 1 location, from which ignitible concentrations of flammable gases or vapors could becommunicated, unless such communication is prevented by adequate positive-pressure ventilation from a source of clean airand effective safeguards against ventilation failure are provided.

[70:505.5(B)(3)]


50 of 58 7/9/2014 3:13 PM

5.1.2 (former 4.1.7) For the purpose of this recommended practice, areas not classified as Class I, Division 1; Class I, Division2: or as Class I, Zone 0, Zone 1, or Zone 2, are “unclassified” areas.

5.1.3 (former 4.1.4) The intent of Articles 500 and 505 of the NEC is to prevent combustible material from being ignited byelectrical equipment and wiring systems.

5.1.3.1 (former 4.3) Conditions Necessary for Ignition. In a Class I area, the following three conditions must be satisfied for thecombustible material to be ignited by the electrical installation:

(1) A combustible material must be present.

(2) It must be mixed with air in the proportions required to produce an ignitible mixture.

(3) There must be a release of sufficient energy to ignite the mixture.

5.1.4 (former 4.1.5) Electrical installations within hazardous (classified) locations can use various protection techniques. Nosingle protection technique is best in all respects for all types of equipment used in a chemical plant.

5.1.4.1 (former 4.1.5.1) Explosionproof enclosures, pressurized equipment, and intrinsically safe circuits are applicable to bothDivision 1 and Division 2 locations.

5.1.4.2 (former 4.1.5.2) Nonincendive equipment is permitted in Division 2 locations.

5.1.4.3* (former 4.1.5.3*) Portable electronic products (PEPs) meeting the requirements for PEP-1 or PEP-2 of ANSI/ISA-RP12.12.03 Recommended Practice for Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I,Zone 2, and Class III, Division 1 and 2 Hazardous (Classified) Locations, are considered suitable for use in Division 2 andZone 2 locations.

5.1.4.4 (former 4.1.5.4) Nonsparking electrical equipment and other less restrictive equipment, as specified in the NEC, arepermitted in Division 2 locations.

5.1.5 (former 4.1.6) Factors such as corrosion, weather, maintenance, equipment standardization and interchangeability, andpossible process changes or expansion frequently dictate the use of special enclosures or installations for electrical systems.However, such factors are outside the scope of this recommended practice, which is concerned entirely with the properapplication of electrical equipment to avoid ignition of combustible materials


Material which was located under the section dealing with Material Group has been properly relocated under this section dealing with Classification. Aside from organization, there was no intent to introduce new information which was not otherwise found in 497 or the NEC.




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51 of 58 7/9/2014 3:13 PM

Public Input No. 19-NFPA 497-2014 [ New Section after 5.8.4 ]


5.8.5* Step 5 - Documentation

Documentation is needed for all areas designated as hazardous (classified) locations. Such documentation should beavailable to those authorized to design, install, inspect, maintain, or operate electrical equipment and process equipment atthe location.

Documentation should be current and include, as a minimum, for all areas that are classified: (1) the Class, (2) the Division orZone, (3) the name of combustible material(s) and its respective Material group and Autoignition temperature or appropriatedesign T-code. It may also be desirable also to include the maximum permissible operating temperature or temperaturerange for electrical equipment in the area.

*5.8.5 The customary means of documenting hazardous (classified) area locations is with a plan view of the hazardous areaclassification location depicting: a) the major process or other equipment and components that may be the release source offlammable gases or vapors, or flammable liquids to the atmosphere; b) the boundaries of the various area classifications andc) other information (Le., information on ventilation) necessary to properly classify a location. Elevations or sections aredesirable where different classifications apply at varying elevations. This documentation serves as a record of the originalhazardous area classifications and as a guide when future additions or revisions to the facility are considered.


Documentation is an extremely important aspect of hazardous area classification and while implied in a number of sections within this practice, documentation is not specifically called out. This new section addresses this important need.




Street Address:

City:

State:

Zip:

Submittal Date: Mon Jun 30 11:37:08 EDT 2014


52 of 58 7/9/2014 3:13 PM


5.9.15 Marine Terminal - Liguefied Natural Gas (See Figure 5.9.15)

Figure 5.9.15 (extract from NFPA 59A, Figure 10.7.2(b))

******Insert Figure 5.9.15 Here******



497_Bowdoin.pdf Cover sheet includes artwork


To provide beneficial guidance to users of NFPA 497 regarding electrically classified areas at LNG marine terminals.


Submitter Full Name: Leon Bowdoin

Organization: Hess LNG

Street Address:

City:

State:

Zip:

Submittal Date: Wed Jun 19 09:35:24 EDT 2013


53 of 58 7/9/2014 3:13 PM

Public Input No. 13-NFPA 497-2014 [ Chapter C ]

Annex C Informational References

C.1 Reference Publications.

The documents or portions thereof listed in this annex are referenced within the informational sections of this recommendedpractice and are not part of the recommendations of this document unless also listed in Chapter 2 for other reasons.

C.1.1 NFPA Publications.



NFPA 70 ®, National Electrical Code ®, 2011 edition 2014 .

NFPA Fire Protection Guide to Hazardous Materials, 2002 edition 2010 .

C.1.2 Other Publications.

C.1.2.1 ASTM Publications.

ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428–2959.

ASTM E 659-78 , Standard Test Method for Autoignition Temperature of Liquid Chemicals, 2005 2014 .

C.1.2.2 IEC Publications.


IEC 60079-1-1, Electrical apparatus for explosive gas atmospheres, Part 1-1: Flameproof enclosures “d”— Method of test forascertainment of maximum experimental safe gap , 2002.

IEC 60079-11, Electrical apparatus for explosive gas atmospheres, Part 11—Intrinsic safety “i,” 1999.

IEC/TR3 60079-20, Electrical apparatus for explosive gas atmospheres, Part 20: Data for flammable gases and vapours,relating to the use of electrical apparatus , 1996 11, Explosive Atomspheres - Part 11 : Equipment Protection ByIntrinsic safety “ I ” 2012 .

IEC 60079-20 -1 , Explosive Atomspheres - Part 20-1 : Material Characteristics of Gas and Vapor Classification -Test Methods and Data, 2012 .

C.1.2.3 NAS Publications.

National Materials Advisory Board of the National Academy of Sciences, 500 Fifth Street, NW, Washington, DC 20055.

NMAB 353-1, Matrix of Combustion-Relevant Properties and Classification of Gases, Vapors and Selected Solids, 1979.

C.1.2.4 UL Publications.

Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.

Technical Report No. 58 (TR 58), An Investigation of Flammable Gases or Vapors with Respect to Explosion-Proof ElectricalEquipment, 1993.


54 of 58 7/9/2014 3:13 PM

C.1.2.5 Other Publications.

Brandes, E. and Redeker, T. “Maximum Experimental Safe Gap of Binary and Ternary Mixtures.” Journal de Physique IVFrance, Vol. 12, No. 7, 2002.

Lunn, G. A., “Maximum Experimental Safe Gap: The Effects of Oxygen Enrichment and the Influence of Reaction Kinetics,”Journal of Hazardous Materials, 261–270, 1984.

Phillips, H. “Differences between Determinations of Maximum Experimental Safe Gaps in Europe and U.S.A.” Journal ofHazardous Materials, 1981.

Rodgers, S. A., “Fuel Ratio Method for Estimating the MESG of Nitrogen-Diluted and Oxygen-Enriched Fuels, Including theBrandes-Redeker Method to Estimate the MESG of Mixed Fuels,” AIChE 6th Global Congress on Process Safety, 44thAnnual Loss Prevention Symposium, San Antonio, TX March 22–24, 2010.

Thomas, G., “Pipeline Explosions I: An Evaluation of MESG as a Relative Measure of Potential Explosion Severity and theGenesis of a Mimic Gas Concept for Explosion Hazard Testing,” 5th Int. Seminar on Fire and Explosion Hazards, Edinburgh,Scotland, 2007.

C.2 Informational References.

The following documents or portions thereof are listed here as informational resources only. They are not a part of therecommendations of this document.

C.2.1 NFPA Publications.


NFPA 30, Flammable and Combustible Liquids Code, 2012 edition.


C.2.2 ASHRAE Publications.

American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, NE, Atlanta, GA30329-2305.

ASHRAE 15 & 34 , Safety Code Standard for Mechanical Refrigeration Systems , 2007 2013 with 2014 errata .

C.2.3 ASTM Publications.


ASTM D 56-05 , Standard Method of Test for Flash Point by the Tag Closed Tester, 2010.

ASTM D 93-10a , Standard Test Method for Flash Point by Pensky-Martens Closed Cup Tester, 2010 2013 with 2014errata .

ASTM D 3278-96 , Standard Method of Tests for Flash Point of Liquids by Small Scale Closed-Cup Apparatus, 2011.

ASTM E 681-09 , Standard Test Method for Concentration Limits of Flammability of Chemicals (Vapors and Gases), 2009.

C.2.4 Bureau of Mines Publications.

U.S. Government Printing Office, Washington, DC 20402.

RI 7009, Minimum Ignition Energy and Quenching Distance in Gaseous Mixture.

C.2.5 CGA Publications.

Compressed Gas Association, 4221 Walney Road, 5th Floor 14501 George Carter Way , Suite 103 , Chantilly, VA20151- 2923 1788 .

ANSI/ CGA G-2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia, 1999.

C.2.6 IEC Publications.


IEC 60079-20-1, Electrical Apparatus For Explosive Gas Atmospheres Atomspheres , Part 12: Classification of mixturesof gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents,2010-01 20-1 : Material Characteristics for Gas and Vapor Classification - Test Methods and Data , 2012 .

C.2.7 Other Publications.

Energy Institute (Institute of Petroleum), Model Code of Safe Practice for the Petroleum Industry, Part 15: Area ClassificationCode for Installations Handling Flammable Fluids, 2008.

Hilado, C. J., and S. W. Clark. “Autoignition Temperatures of Organic Chemicals.” Chemical Engineering, September 4, 1972.

C.3 References for Extracts in Informational Sections.

(Reserved)


Referenced current editions, titles and addresses.




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Public Input No. 12-NFPA 497-2014 [Chapter 2] Referenced current editions titles, and addresses.




Street Address:

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56 of 58 7/9/2014 3:13 PM

Public Input No. 7-NFPA 497-2014 [ Section No. C.2.2 ]

C.2.2 ASHRAE Publications.

American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, NE, Atlanta, GA30329-2305.

ASHRAE 15, Safety Code Standard for Mechanical Refrigeration Systems , 2007 2013 .









Street Address:

City:

State:

Zip:



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FOR OFFICE USE ONLY

Log #:

Date Rec’d:






NFPA® 497




or Vapors and of


Locations










mmaynard

Text Box

.









1/30/2014

Public Input No. 21-NFPA 497-2014 [ Section No. C.2.3 ]

C.2.3 ASTM Publications.


ASTM D 56-05 , Standard Method of Test for Flash Point by the Tag Closed Tester, 05( 2010) .

ASTM D 93-10a , Standard Test Method for Flash Point by Pensky-Martens Closed Cup Tester, 2010 2013e1 .

ASTM D 3278-96 , Standard Method of Tests for Flash Point of Liquids by Small Scale Closed-Cup Apparatus, 96( 2011) .

ASTM E 681-09 , Standard Test Method for Concentration Limits of Flammability of Chemicals (Vapors and Gases), 2009.






Street Address:

City:

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58 of 58 7/9/2014 3:13 PM

Attachment F

NFPA 496

A2016 Public Input


5.2.2

Where When the enclosure has been opened or if the protective gas supply has failed to maintain therequired positive pressure, the enclosure shall be purged.


Editorial change. "Where" is a location, not a situation. The intent is that the enclosure will be purged after (time, not place) it has been opened.


Submitter Full Name: William Fiske

Organization: Intertek Testing Services

Affilliation: Self

Street Address:

City:

State:

Zip:

Submittal Date: Thu May 15 15:48:11 EDT 2014


1 of 9 7/9/2014 3:06 PM

Public Input No. 6-NFPA 496-2014 [ Section No. 5.2.6.1 ]

5.2.6.1

Components with a free internal volume less than 20 cm3 (1.22 in.3) shall not be required to be consideredas internal compartments requiring protection, provided the total volume of all such components is not asignificant portion not more than 10 per cent of the protected enclosure volume.


"A significant portion" is unenforceable language, that is not in accordance with 2.2.2.1 of the NFPA Manual of Style, and "significant" is even on of the words in Table 2.2.2.3. AS NFPA 496 must be usable by first parties, second parties and third parties, an objective criterion for acceptance is needed. The Submitter freely admits not knowing if 10 per cent of the internal volume of an enclosure is "significant" enough to warrant protection of individual compartments or not, but 10 per cent gives the technical committee a starting point. The final number chosen may be higher or lower.




Affilliation: Self

Street Address:

City:

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Zip:



2 of 9 7/9/2014 3:06 PM


8.3.5

In applications where flammable mixtures shall be are permitted to be piped into the enclosure through theflammable gas or vapor system, precautions shall be taken to prevent propagation of an explosion back tothe process equipment.


Editorial change. 8.3.5 does not mandate (shall be permitted) that flammable mixtures be piped into the enclosure, it says what is to be done in the event the mixtures are piped in. "Shall be permitted" not the right term for this provision.




Affilliation: Self

Street Address:

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Zip:



3 of 9 7/9/2014 3:06 PM

Public Input No. 7-NFPA 496-2014 [ Section No. 9.3.1.2 ]

9.3.1.2

Orifices or other flow-limiting devices shall be located outside and close to within 450 mm (18 in.) of thewall of the building or room.


"Close to" is unenforceable language, and not in accordance with 2.2.2.1 of the NFPA Style Manual. Because NFPA 496 is intended for use by first parties, second parties and third parties, an objective criterion for acceptance is needed. The recommended distance of 450 mm is consistent with the placement of conduit seals required by 501.15(A)(2) in the 2014 National Electrical Code.




Affilliation: Self

Street Address:

City:

State:

Zip:



4 of 9 7/9/2014 3:06 PM

Public Input No. 8-NFPA 496-2014 [ New Section after A.3.3.15 ]

A.4.3.1. NFPA 496 encompasses enclosures, rooms and buildings. It is not possible to specify acceptancecriteria for many different constructions in a single standard. Construction criteria for electrical enclosuresmay be found in ANSI/UL 50. Construction criteria for pressurized rooms may be found in IEC 60079-13. Structural requirements for analyzer rooms and houses may be found in NFPA 5000.


4.3.1 of NFPA 496 specifies that pressurized enclosures be so constructed as to be unlikely to be damaged under conditions of use. Because NPFA 496 encompasses electrical enclosures, rooms and buildings, there is no single set of criteria available to judge their suitability under this provision. An informative Annex to 4.3.1, and references in Annex B will identify suitable criteria, depending on the type of "enclosure" involved.




Affilliation: Self

Street Address:

City:

State:

Zip:

Submittal Date: Fri May 16 09:41:52 EDT 2014


5 of 9 7/9/2014 3:06 PM

Public Input No. 9-NFPA 496-2014 [ New Section after B.1.1 ]

NFPA 5000, Building Construction and Safety Code, 2012 Edition


As stated in the substantiation for adding A.4.3.1, NFPA 496 needs criteria for judging enclosures, rooms and buildings. NFPA 5000 contains criteria for judging building construction.




Affilliation: Self

Street Address:

City:

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6 of 9 7/9/2014 3:06 PM

Public Input No. 10-NFPA 496-2014 [ New Section after B.1.2.1 ]

ANSI/UL 50, Enclosures for Electrical Equipment, Non-Environmental Considerations, 2007, revised 2012.


NFPA 496 does not include criteria for judging the suitability of electrical enclosures according to the provisions of 4.3.1. Those criteria are contained in UL 50.




Affilliation: Self

Street Address:

City:

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Zip:



7 of 9 7/9/2014 3:06 PM

Public Input No. 12-NFPA 496-2014 [ Section No. B.2.1 ]

B.2.1 ASTM Publications.

ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.

ASTM E 659, Standard Test Method for the Autoignition Temperature of Liquid Chemicals, 2005 2014 .


Update year date of standard.




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8 of 9 7/9/2014 3:06 PM

Public Input No. 11-NFPA 496-2014 [ New Section after B.2.2 ]

IEC 60079-13-2010, Explosive Atmospheres - Part 13: Equipment protection by pressurized room "p".


4.3.1 of NFPA 496 does not contain criteria for judging pressurized rooms, and objective criteria are needed. They may be found in IEC 60079-13.




Affilliation: Self

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9 of 9 7/9/2014 3:06 PM

Attachment G

NFPA 499

A2016 Public Input


Chapter 2 Referenced Publications

2.1 General.

The documents or portions thereof listed in this chapter are referenced within this recommended practiceand should be considered part of the recommendations of this document.

2.2 NFPA Publications.



NFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food ProcessingFacilities, 2013 edition .

NFPA 68, Standard on Explosion Protection by Deflagration Venting, 2007 edition 2013 .

NFPA 69, Standard on Explosion Prevention Systems, 2008 edition 2014 .


NFPA 484, Standard for Combustible Metals, 2012 edition 2015 .

NFPA 654, Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing,and Handling of Combustible Particulate Solids, 2013 edition .

NFPA 655, Standard for Prevention of Sulfur Fires and Explosions, 2012 edition .

NFPA 664, Standard for the Prevention of Fires and Explosions in Wood Processing and WoodworkingFacilities, 2012 edition .

2.3 Other Publications.



ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke, 2011.

ASTM E 11, Standard Specification for Wire Cloth and Sieves for Testing Purposes, 2009 2013 .

ASTM E 1226, Standard Test Method for Explosibility of Dust Clouds, 2010 2012A .

ASTM E 1491, Standard Test Method for Minimum Autoignition Temperatures of Dust Clouds, 2006,reapproved 2012 .

ASTM E 2021, Standard Test Method for Hot-Surface Ignition Temperature of Dust Layers, 2009,reapproved 2013 .

2.3.2 ISO Publications.

International Organization for Standardization, 1, rue de Varembe, Case postale 56, CH-1211 Geneve 20,Switzerland.

ISO 6184–1, Explosion protection systems — Part 1: Determination of explosion indices of combustibledust in air, 1985.

2.3.3 Other Publications.

Merriam-Webster’s Collegiate Dictionary, 11th edition, Merriam-Webster, Inc., Springfield, MA, 2003.

2.4 References for Extracts in Recommendations Sections.




Referenced current editions.


1 of 30 7/9/2014 3:22 PM



Public Input No. 21-NFPA 499-2014 [Chapter B]




Street Address:

City:

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Zip:

Submittal Date: Sat Jun 14 23:21:55 EDT 2014


2 of 30 7/9/2014 3:22 PM





ASTM E 11, Standard Specification for Wire Cloth and Sieves for Testing Purposes, 2009 2013 .

ASTM E 1226, Standard Test Method for Explosibility of Dust Clouds, 2010 2012a .

ASTM E 1491, Standard Test Method for Minimum Autoignition Temperatures of Dust Clouds, 200606(2012) .

ASTM E 2021, Standard Test Method for Hot-Surface Ignition Temperature of Dust Layers, 200909(2013) .






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3 of 30 7/9/2014 3:22 PM


Delete Section 3.3.4 , 3.3.4.1, 3.3.4.2 and 3.3.4.3 .

3.3.4 Combustible Dust Groups.

Combustible dusts are addressed in the National Electrical Code, in Articles 500 and 502, and are dividedinto Groups E, F, and G.

3.3.4.1 Group E.

Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercialalloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similarhazards in the use of electrical equipment.

3.3.4.2* Group F.

Atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrappedvolatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal andCoke, for coal and coke dusts) or that have been sensitized by other materials so that they present anexplosion hazard.

3.3.4.3* Group G.

Atmospheres containing combustible dusts not included in Group E or Group F, including flour, grain, wood,plastic, and chemicals.


The material contained in the current definition section dealing with Combustible Materials (3.3.4, 3.3.4.1, 3.3.4.2 and 3.3.4.3) does not belong under Definitions but rather needs to be addressed as done under the NEC as explanatory material. The change presented moves this material into a separate Section, like Section 4 (see other Public Input) again following the NEC, dealing with combustible material.




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4 of 30 7/9/2014 3:22 PM


3.3.4 Combustible Dust Groups.

Combustible dusts are addressed in the National Electrical Code , in Articles 500 and 502, and are dividedinto Groups E, F, and G.

3.3.4.1 Group E.

Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercialalloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similarhazards in the use of electrical equipment.

3.3.4.2 * Group F.

Atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrappedvolatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal andCoke , for coal and coke dusts) or that have been sensitized by other materials so that they present anexplosion hazard.

3.3.4.3 * Group G.

Atmospheres containing combustible dusts not included in Group E or Group F, including flour, grain,wood, plastic, and chemicals.


These definitions are not in compliance with the manual of style which states that definitions (which are not enforceable) cannot contain requirements or references to codes, standards or regulations. The information is proposed to be moved to the body of the document in section 5.2.







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Renumber existing 4.3 to 4.4 Additional Potential Combustible Dust Hazards and add the followingnew section 4.3 as shown:

4.3 Classification of Combustible Dusts

4.3.1 Combustible Dust Groups. Combustible dusts are addressed in the National Electrical Code,in Articles 500, 502, and 506.

4.3.2 In Class II- Divisions, hazardous (classified) location the combustible dust are divided into Groups E, F,and G.

4.3.2.1 Group E. Atmospheres containing combustible metal dusts, including aluminum, magnesium, andtheir commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivitypresent similar hazards in the use of electrical equipment.

4.3.2.2 (retain appendix material 3.3.4.2*) Group F. Atmospheres containing combustiblecarbonaceous dusts that have more than 8 percent total entrapped volatiles (see ASTM D 3175,Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke, for coal andcoke dusts) or that have been sensitized by other materials so that they present an explosionhazard.

4.3.2.3 (retain appendix material 3.3.4.3*) Group G. Atmospheres containing combustible dusts not includedin Group E or Group F, including flour, grain, wood, plastic, and chemicals.

4.3.3 In Class II- Zones, hazardous (classified) location the combustible dust are divided into Zone GroupsIIIC and IIIB.

4.3.3.1 Zone Group IIIC. Atmospheres containing combustible metal dusts, including aluminum, magnesium,and their commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivitypresent similar hazards in the use of electrical equipment.

4.3.3.2 Zone Group IIIB. Atmospheres containing 1) combustible carbonaceous dusts that have more than 8percent total entrapped volatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in theAnalysis Sample of Coal and Coke, for coal and coke dusts) or that have been sensitized by other materialsso that they present an explosion hazard or 2) combustible dusts not included in Zone Group IIIC includingflour, grain, wood, plastic, and chemicals.

Informational Note No. 1: Ignitible fibers and flyings addressed in NEC Article 506 are not consideredcombustible dusts under the scope of this recommended practice.

4.3.4 5.2.2* A listing of selected combustible dusts with their group classification and relevant physicalproperties is provided in Table 4.x.x (former Table 5.2.2). The chemicals are listed alphabetically.

Revise this table to include new column showing Zone Groups and editing this information in this newcolumn by adding IIIB across from each G and F entry, and IIIC across each E entry

4.3.5 5.2.3 Table 4.x.x (former Table 5.2.3) provides a cross-reference of selected chemicals sorted by theirChemical Abstract Service (CAS) numbers.

4.3.6 5.2.4 References that deal with the testing of various characteristics of combustible materials are listedin B.2.1, B.2.2, and B.2.4.

Delete 5.2 completely.



499_table_4.5.2_revised.rtfRevised table 4.5.2 with added column and red new information to reflect Zone Combustible dusts


Action from other Public Input removed under definitions Combustible Materials. The action here is to restore


6 of 30 7/9/2014 3:22 PM

Table 4.5.2 Selected Combustible Materials

Chemical Name CAS No. Division Grp/

Zone Group

Code Layer or Cloud

Ignition Temp.

(°C)

Acetal, Linear G/IIIB NL 440

Acetoacet-p-phenetidide 122-82-7 G//IIIB NL 560

Acetoacetanilide 102-01-2 G//IIIB M 440

Acetylamino-t-nitrothiazole G//IIIB 450

Acrylamide Polymer G/IIIB 240

Acrylonitrile Polymer G//IIIB 460

Acrylonitrile-Vinyl Chloride-Vinylidenechloride copolymer

(70-20-10)

G//IIIB 210

Acrylonitrile-Vinyl Pyridine Copolymer G//IIIB 240

Adipic Acid 124-04-9 G//IIIB M 550

Alfalfa Meal G//IIIB 200

Alkyl Ketone Dimer Sizing Compound G//IIIB 160

Allyl Alcohol Derivative (CR-39) G//IIIB NL 500

Almond Shell G//IIIB 200

Aluminum, A422 Flake 7429-90-5 E/IIIC 320

Aluminum, Atomized Collector Fines E/IIIC CL 550

Aluminum—cobalt alloy (60-40) E/IIIC 570

Aluminum—copper alloy (50-50) E/IIIC 830

Aluminum—lithium alloy (15% Li) E/IIIC 400

Aluminum—magnesium alloy (Dowmetal) E/IIIC CL 430

Aluminum—nickel alloy (58-42) E/IIIC 540

Aluminum—silicon alloy (12% Si) E/IIIC NL 670

Amino-5-nitrothiazole 121-66-4 G/IIIB 460

Anthranilic Acid 118-92-3 G/IIIB M 580

Apricot Pit G/IIIB 230

Aryl-nitrosomethylamide G/IIIB NL 490

Asphalt 8052-42-4 F/IIIB 510

Aspirin [acetol (2)] 50-78-2 G/IIIB M 660

Azelaic Acid 109-31-9 G/IIIB M 610

Azo-bis-butyronitrile 78-67-1 G/IIIB 350

Benzethonium Chloride G/IIIB CL 380

Benzoic Acid 65-85-0 G/IIIB M 440

Benzotriazole 95-14-7 G/IIIB M 440

Beta-naphthalene-axo-dimethylaniline G/IIIB 175

Bis(2-hydroxy-5-chlorophenyl) Methane 97-23-4 G/IIIB NL 570

Bisphenol-A 80-05-7 G/IIIB M 570

Boron, Commercial Amorphous (85% B) 7440-42-8 E/IIIC 400

Calcium Silicide E/IIIC 540

Carbon Black (More Than 8% Total Entrapped Volatiles) F/IIIB

Carboxymethyl Cellulose 9000-11-7 G/IIIB 290

Carboxypolymethylene G/IIIB NL 520

Cashew Oil, Phenolic, Hard G/IIIB 180

Cellulose G/IIIB 260

Cellulose Acetate G/IIIB 340

Cellulose Acetate Butyrate G/IIIB NL 370

Cellulose Triacetate G/IIIB NL 430

Charcoal (Activated) 64365-11-3 F/IIIB 180

Charcoal (More Than 8% Total Entrapped Volatiles) F/IIIB

Cherry Pit G/IIIB 220

Chlorinated Phenol G/IIIB NL 570

Chlorinated Polyether Alcohol G/IIIB 460

Chloroacetoacetanilide 101-92-8 G/IIIB M 640

Chromium (97%) Electrolytic, Milled 7440-47-3 E/IIIC 400

Cinnamon G/IIIB 230

Citrus Peel G/IIIB 270

Coal, Kentucky Bituminous F/IIIB 180

Coal, Pittsburgh Experimental F/IIIB 170

Coal, Wyoming F/IIIB 180

Cocoa Bean Shell G/IIIB 370

Cocoa, Natural, 19% Fat G/IIIB 240

Coconut Shell G/IIIB 220

Coke (More Than 8% Total Entrapped Volatiles) F/IIIB

Cork G/IIIB 210

Corn G/IIIB 250

Corn Dextrine G/IIIB 370

Corncob Grit G/IIIB 240

Cornstarch, Commercial G/IIIB 330

Cornstarch, Modified G/IIIB 200

Cottonseed Meal G/IIIB 200

Coumarone-Indene, Hard G/IIIB NL 520

Crag No. 974 533-74-4 G/IIIB CL 310

Cube Root, South America 83-79-4 G/IIIB 230

Di-alphacumyl Peroxide, 40-60 on CA 80-43-3 G/IIIB 180

Diallyl Phthalate 131-17-9 G/IIIB M 480

Dicyclopentadiene Dioxide G/IIIB NL 420

Dieldrin (20%) 60-57-1 G/IIIB NL 550

Dihydroacetic Acid G/IIIB NL 430

Dimethyl Isophthalate 1459-93-4 G/IIIB M 580

Dimethyl Terephthalate 120-61-6 G/IIIB M 570

Dinitro-o-toluamide 148-01-6 G/IIIB NL 500

Dinitrobenzoic Acid G/IIIB NL 460

Diphenyl 92-52-4 G/IIIB M 630

Ditertiary-butyl-paracresol 128-37-0 G/IIIB NL 420

Dithane m-45 8018-01-7 G/IIIB 180

Epoxy G/IIIB NL 540

Epoxy-bisphenol A G/IIIB NL 510

Ethyl Cellulose G/IIIB CL 320

Ethyl Hydroxyethyl Cellulose G/IIIB NL 390

Ethylene Oxide Polymer G/IIIB NL 350

Ethylene-maleic Anhydride Copolymer G/IIIB NL 540

Ferbam™ 14484-64-1 G/IIIB 150

Ferromanganese, Medium Carbon 12604-53-4 E/IIIC 290

Ferrosilicon (88% Si, 9% Fe) 8049-17-0 E/IIIC 800

Ferrotitanium (19% Ti, 74.1% Fe, 0.06% C) E/IIIC CL 380

Flax Shive G/IIIB 230

Fumaric Acid 110-17-8 G/IIIB M 520

Garlic, Dehydrated G/IIIB NL 360

Gilsonite 12002-43-6 F/IIIB 500

Green Base Harmon Dye G/IIIB 175

Guar Seed G/IIIB NL 500

Gulasonic Acid, Diacetone G/IIIB NL 420

Gum, Arabic G/IIIB 260

Gum, Karaya G/IIIB 240

Gum, Manila G/IIIB CL 360

Gum, Tragacanth 9000-65-1 G/IIIB 260

Hemp Hurd G/IIIB 220

Hexamethylene Tetramine 100-97-0 G/IIIB S 410

Hydroxyethyl Cellulose G/IIIB NL 410

Iron, 98% H2 Reduced E/IIIC 290

Iron, 99% Carbonyl 13463-40-6 E/IIIC 310

Isotoic Anhydride G/IIIB NL 700

L-sorbose G/IIIB M 370

Lignin, Hydrolized, Wood-type, Fine G/IIIB NL 450

Lignite, California F/IIIB 180

Lycopodium G/IIIB 190

Malt Barley G/IIIB 250

Manganese 7439-96-5 E/IIIC 240

Magnesium, Grade B, Milled E/IIIC 430

Manganese Vancide G/IIIB 120

Mannitol 69-65-8 G/IIIB M 460

Methacrylic Acid Polymer G/IIIB 290

Methionine (l-methionine) 63-68-3 G/IIIB 360

Methyl Cellulose G/IIIB 340

Methyl Methacrylate Polymer 9011-14-7 G/IIIB NL 440

Methyl Methacrylate-ethyl Acrylate G/IIIB NL 440

Methyl Methacrylate-styrene-butadiene G/IIIB NL 480

Milk, Skimmed G/IIIB 200

N,N-Dimethylthio-formamide G/IIIB 230

Nitropyridone 100703-82-0 G/IIIB M 430

Nitrosamine G/IIIB NL 270

Nylon Polymer 63428-84-2 G/IIIB 430

Para-oxy-benzaldehyde 123-08-0 G/IIIB CL 380

Paraphenylene Diamine 106-50-3 G/IIIB M 620

Paratertiary Butyl Benzoic Acid 98-73-7 G/IIIB M 560

Pea Flour G/IIIB 260

Peach Pit Shell G/IIIB 210

Peanut Hull G/IIIB 210

Peat, Sphagnum 94114-14-4 G/IIIB 240

Pecan Nut Shell 8002-03-7 G/IIIB 210

Pectin 5328-37-0 G/IIIB 200

Pentaerythritol 115-77-5 G/IIIB M 400

Petrin Acrylate Monomer 7659-34-9 G/IIIB NL 220

Petroleum Coke (More Than 8% Total Entrapped Volatiles) F/IIIB

Petroleum Resin 64742-16-1 G/IIIB 500

Phenol Formaldehyde 9003-35-4 G/IIIB NL 580

Phenol Formaldehyde, Polyalkylene-p 9003-35-4 G/IIIB 290

Phenol Furfural 26338-61-4 G/IIIB 310

Phenylbetanaphthylamine 135-88-6 G/IIIB NL 680

Phthalic Anydride 85-44-9 G/IIIB M 650

Phthalimide 85-41-6 G/IIIB M 630

Pitch, Coal Tar 65996-93-2 F/IIIB NL 710

Pitch, Petroleum 68187-58-6 F/IIIB NL 630

Polycarbonate G/IIIB NL 710

Polyethylene, High Pressure Process 9002-88-4 G/IIIB 380

Polyethylene, Low Pressure Process 9002-88-4 G/IIIB NL 420

Polyethylene Terephthalate 25038-59-9 G/IIIB NL 500

Polyethylene Wax 68441-04-8 G/IIIB NL 400

Polypropylene (no antioxidant) 9003-07-0 G/IIIB NL 420

Polystyrene Latex 9003-53-6 G/IIIB 500

Polystyrene Molding Compound 9003-53-6 G/IIIB NL 560

Polyurethane Foam, Fire Retardant 9009-54-5 G/IIIB 390

Polyurethane Foam, No Fire Retardant 9009-54-5 G/IIIB 440

Polyvinyl Acetate 9003-20-7 G/IIIB NL 550

Polyvinyl Acetate/Alcohol 9002-89-5 G/IIIB 440

Polyvinyl Butyral 63148-65-2 G/IIIB 390

Polyvinyl Chloride-dioctyl Phthalate G/IIIB NL 320

Potato Starch, Dextrinated 9005-25-8 G/IIIB NL 440

Pyrethrum 8003-34-7 G/IIIB 210

Rayon (Viscose) Flock 61788-77-0 G/IIIB 250

Red Dye Intermediate G/IIIB 175

Rice G/IIIB 220

Rice Bran G/IIIB NL 490

Rice Hull G/IIIB 220

Rosin, DK 8050-09-7 G/IIIB NL 390

Rubber, Crude, Hard 9006-04-6 G/IIIB NL 350

Rubber, Synthetic, Hard (33% S) 64706-29-2 G/IIIB NL 320

Safflower Meal G/IIIB 210

Salicylanilide 87-17-2 G/IIIB M 610

Sevin 63-25-2 G/IIIB 140

Shale, Oil 68308-34-9 F/IIIB

Shellac 9000-59-3 G/IIIB NL 400

Sodium Resinate 61790-51-0 G/IIIB 220

Sorbic Acid (Copper Sorbate or Potash) 110-44-1 G/IIIB 460

Soy Flour 68513-95-1 G/IIIB 190

Soy Protein 9010-10-0 G/IIIB 260

Stearic Acid, Aluminum Salt 637-12-7 G/IIIB 300

Stearic Acid, Zinc Salt 557-05-1 G/IIIB M 510

Styrene Modified Polyester-Glass Fiber 100-42-5 G/IIIB 360

Styrene-acrylonitrile (70-30) 9003-54-7 G/IIIB NL 500

Styrene-butadiene Latex (>75% styrene) 903-55-8 G/IIIB NL 440

Styrene-maleic Anhydride Copolymer 9011-13-6 G/IIIB CL 470

Sucrose 57-50-1 G/IIIB CL 350

Sugar, Powdered 57-50-1 G/IIIB CL 370

Sulfur 7704-34-9 G/IIIB 220

Tantalum 7440-25-7 E/IIIC 300

Terephthalic Acid 100-21-0 G/IIIB NL 680

Thorium (contains 1.2% O) 7440-29-1 E/IIIC CL 270

Tin, 96%, Atomized (2% Pb) 7440-31-5 E/IIIC 430

Titanium, 99% Ti 7440-32-6 E/IIIC CL 330

Titanium Hydride (95% Ti, 3.8% H) 7704-98-5 E/IIIC CL 480

Trithiobisdimethylthio-formamide G/IIIB 230

Tung, Kernels, Oil-free 8001-20-5 G/IIIB 240

Urea Formaldehyde Molding Compound 9011-05-6 G/IIIB NL 460

Urea Formaldehyde-phenol Formaldehyde 25104-55-6 G/IIIB 240

Vanadium, 86.4% 7440-62-2 E/IIIC 490

Vinyl Chloride-acrylonitrile Copolymer 9003-00-3 G/IIIB 470

Vinyl Toluene-acrylonitrile Butadiene 76404-69-8 G/IIIB NL 530

Violet 200 Dye G/IIIB 175

Vitamin B1, Mononitrate 59-43-8 G/IIIB NL 360

Vitamin C 50-81-7 G/IIIB 280

Walnut Shell, Black G/IIIB 220

Wheat G/IIIB 220

Wheat Flour 130498-22-5 G/IIIB 360

Wheat Gluten, Gum 100684-25-1 G/IIIB NL 520

Wheat Starch G/IIIB NL 380

Wheat Straw G/IIIB 220

Wood Flour G/IIIB 260

Woodbark, Ground G/IIIB 250

Yeast, Torula 68602-94-8 G/IIIB 260

Zirconium Hydride 7704-99-6 E/IIIC 270

Zirconium (contains 0.3% O) 7440-67-7 E/IIIC CL 330

Notes:

1. Normally, the minimum ignition temperature of a layer of a specific dust is lower than the minimum ignition temperature

of a cloud of that dust. Since this is not universally true, the lower of the two minimum ignition temperatures is listed. If no

symbol appears in the “Code” column, then the layer ignition temperature is shown. “CL” means the cloud ignition

temperature is shown. “NL” means that no layer ignition temperature is available, and the cloud ignition temperature is

shown. “M” signifies that the dust layer melts before it ignites; the cloud ignition temperature is shown. “S” signifies that the

dust layer sublimes before it ignites; the cloud ignition temperature is shown.

2. Certain metal dusts may have characteristics that require safeguards beyond those required for atmospheres containing the

dusts of aluminum, magnesium, and their commercial alloys. For example, zirconium and thorium dusts may ignite

spontaneously in air, especially at elevated temperatures.

3. Due to the impurities found in coal, its ignition temperatures vary regionally and ignition temperatures are not available for

all regions in which coal is mined.

under an explanatory section this needed material including that required to address Zone Combustible Dust Materials. It is vital that those materials found to be combustible dusts under this recommended practice are appropriately identified and presented in consistent terms found within the scope of this practice.




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Add new section 5.1.4 as shown below:

5.1.4 Class II –Zone hazardous (classified) location is further subdivided into either Class II, Zone 20, Zone21 or Zone 22, in which combustible dust are or may be present in the air or in layers, in quantitiessufficient to produce explosive or ignitible mixtures.

5.1.4.1 Zone 20. A Zone 20 location is a location in which (a) Ignitible concentrations of combustible dustare present continuously.

(b) Ignitible concentrations of combustible dust are present for long periods of time.

5.1.4.2 Zone 21. A Zone 21 location is a location (a) In which ignitible concentrations of combustible dust arelikely to exist occasionally under normal operating conditions; or (b) In which ignitible concentrations ofcombustible dust may exist frequently because of repair or maintenance operations or because of leakage;or (c) In which equipment is operated or processes are carried on, of such a nature that equipmentbreakdown or faulty operations could result in the release of ignitable concentrations of combustible dustand also cause simultaneous failure of electrical equipment in a mode to cause the electrical equipment tobecome a source of ignition; or (d) That is adjacent to a Zone 20 location from which ignitibleconcentrations of dust could be communicated, unless communication is prevented by adequatepositive pressure ventilation from a source of clean air and effective safeguards against ventilation.

5.1.4.3 Zone 22. A Zone 22 location is a location (a) In which ignitible concentrations of combustible dust arenot likely to occur in normal operation and, if they do occur, will only persist for a short period; or (b) In whichcombustible dust are handled, processed, or used but in which the dust are normally confined within closedcontainers of closed systems from which they can escape only as a result of the abnormal operation of theequipment with which the dust are handled, processed, or used; or (c) That is adjacent to a Zone 21location, from which ignitible concentrations of dust could be communicated, unless such communication isprevented by adequate positive pressure ventilation from a source of clean air and effective safeguardsagainst ventilation failure are provided.


With the inclusion of Combustible Dust Zones, the relavent document texts required revision based upon NEC Article 506 addressing Zone 20, 21, and 22, combustible Dust locations based upon the NEC.




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Type your content here ...

Add new section 5.2.2 and renumber accordingly:

New 5.2.2 Combustible Zone Dust Groups. Combustible Zone dusts are addressed

in the National Electrical Code , in Article 506 and are divided into Groups IIIC, and IIIB.

5.2.2.1 Group IIIC. Atmospheres containing combustible metal dusts, including aluminum, magnesium, andtheir commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivitypresent similar hazards in the use of electrical equipment.

5.2.2.2 Group IIIB. Atmospheres containing combustible carbonaceous dusts that have more than 8percent total entrapped volatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in theAnalysis Sample of Coal and Coke , for coal and coke dusts) or that have been sensitized by othermaterials so that they present an explosion hazard, or atmospheres containing combustible dusts notincluded in Group IIIC, including flour, grain, wood, plastic, and chemicals.


Action taken by CMP 14 in the 2012 NEC added combustible zone dust groups to Article 506. NFPA 499 had not taken actions to address this issue during its document cycle. This action coordinates the proper identification of these combustible dusts in context with the scope of NFPA 499. This action also agrees with PI made to the 2016 NEC.




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5.2.1

Combustible dusts are divided into three groups, addressed in the National Electrical Code, NFPA 70, inArticles 500 and 502, and are divided into Groups E, F, and G, depending on the nature of the dust: .

5.2.1.1 Group E. Atmospheres containing combustible metal dusts , including aluminum, magnesium, andtheir commercial alloys, or other combustible dusts whose particle

size, abrasiveness, and conductivity present similar hazards in the use of electrical equipment.

5.2.1.2* Group F. Atmospheres containing combustible carbonaceous dusts that have more than 8 percenttotal entrapped volatiles (seeASTM D 3175 , Standard Test Method

for Volatile Matter in the Analysis Sample of Coal and Coke, for coal and coke dusts) or that have beensensitized by other materials so that they present an explosion hazard.

5.2.1.3* Group G. Atmospheres containing combustible dusts not included in Group E or Group F,including flour, grain, wood, plastic, and chemicals.

A.5.2.1.2 Group F. Coal, carbon black, charcoal, and coke dusts are examples of carbonaceous dusts.

A.5.2.1.3 Group G. Some carbonaceous dusts with low volatiles will burn but are not combustible dusts asdefined by this document. An example would be certain carbon blacks produced by pyrolyzing acrylonitrile.


This simply moves the definitions from chapter 3 to where they belong, in the body of the docuemnt, for compliance with the Manual of Style.







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11 of 30 7/9/2014 3:22 PM

Revise this table with the addition of a new column to address the 'Combustible Zone dusts' which wereadded under PI for Section 5.2.2 . Relabel "NEC Group" to 'Class II Combustible Dust' to agree withrevised Section 5.2.1.

5.2.2 *


12 of 30 7/9/2014 3:22 PM

A listing of selected combustible dusts with their group classification and relevant physical properties isprovided in Table 5.2.2. The chemicals are listed alphabetically.

Table 5.2.2 Selected Combustible Dusts

Chemical Name CAS No.

NEC

Group CodeLayer or Cloud Ignition

Temperature (°C)

Acetal, linear G NL 440

Acetoacet-p-phenetidide 122-82-7 G NL 560

Acetoacetanilide 102-01-2 G M 440

Acetylamino-t-nitrothiazole G 450

Acrylamide polymer G 240

Acrylonitrile polymer G 460

Acrylonitrile-vinyl chloride-vinylidenechloridecopolymer (70-20-10)

G 210

Acrylonitrile-vinyl pyridine copolymer G 240

Adipic acid 124-04-9 G M 550

Alfalfa meal G 200

Alkyl ketone dimer sizing compound G 160

Allyl alcohol derivative (CR-39) G NL 500

Almond shell G 200

Aluminum, A422 flake 7429-90-5 E 320

Aluminum, atomized collector fines E CL 550

Aluminum—cobalt alloy (60-40) E 570

Aluminum—copper alloy (50-50) E 830

Aluminum—lithium alloy (15% Li) E 400

Aluminum—magnesium alloy (dowmetal) E CL 430

Aluminum—nickel alloy (58-42) E 540

Aluminum—silicon alloy (12% Si) E NL 670

Amino-5-nitrothiazole 121-66-4 G 460

Anthranilic acid 118-92-3 G M 580

Apricot pit G 230

Aryl-nitrosomethylamide G NL 490

Asphalt 8052-42-4 F 510

Aspirin [acetol (2)] 50-78-2 G M 660

Azelaic acid 109-31-9 G M 610

Azo-bis-butyronitrile 78-67-1 G 350

Benzethonium chloride G CL 380

Benzoic acid 65-85-0 G M 620

Benzotriazole 95-14-7 G M 440

Beta-naphthalene-axo-

dimethylanilineG 175

Bis(2-hydroxy-

5-chlorophenyl) methane97-23-4 G NL 570

Bisphenol-A 80-05-7 G M 570


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NEC


Temperature (°C)

Boron, commercial amorphous (85% B) 7440-42-8 E 400

Calcium silicide E 540

Carbon black (more than 8% total entrappedvolatiles)

F

Carboxymethyl cellulose 9000-11-7 G 290

Carboxypolymethylene G NL 520

Cashew oil, phenolic, hard G 180

Cellulose G 260

Cellulose acetate G 340

Cellulose acetate butyrate G NL 370

Cellulose triacetate G NL 430

Charcoal (activated) 64365-11-3 F 180

Charcoal (more than 8% total entrappedvolatiles)

F

Cherry pit G 220

Chlorinated phenol G NL 570

Chlorinated polyether alcohol G 460

Chloroacetoacetanilide 101-92-8 G M 640

Chromium (97%) electrolytic, milled 7440-47-3 E 400

Cinnamon G 230

Citrus peel G 270

Coal, Kentucky bituminous F 180

Coal, Pittsburgh experimental F 170

Coal, Wyoming F 180

Cocoa bean shell G 370

Cocoa, natural, 19% fat G 240

Coconut shell G 220

Coke (more than 8% total entrapped volatiles) F

Cork G 210

Corn G 250

Corn dextrine G 370

Corncob grit G 240

Cornstarch, commercial G 330

Cornstarch, modified G 200

Cottonseed meal G 200

Coumarone-indene, hard G NL 520

Crag No. 974 533-74-4 G CL 310

Cube root, South America 83-79-4 G 230

Di-alphacumyl peroxide, 40-60 on CA 80-43-3 G 180

Diallyl phthalate 131-17-9 G M 480

Dicyclopentadiene dioxide G NL 420

Dieldrin (20%) 60-57-1 G NL 550

Dihydroacetic acid G NL 430

Dimethyl isophthalate 1459-93-4 G M 580


14 of 30 7/9/2014 3:22 PM


NEC


Temperature (°C)

Dimethyl terephthalate 120-61-6 G M 570

Dinitro-o-toluamide 148-01-6 G NL 500

Dinitrobenzoic acid G NL 460

Diphenyl 92-52-4 G M 630

Ditertiary-butyl-paracresol 128-37-0 G NL 420

Dithane m-45 8018-01-7 G 180

Epoxy G NL 540

Epoxy-bisphenol A G NL 510

Ethyl cellulose G CL 320

Ethyl hydroxyethyl cellulose G NL 390

Ethylene oxide polymer G NL 350

Ethylene-maleic anhydride copolymer G NL 540

Ferbam™ 14484-64-1 G 150

Ferromanganese, medium carbon 12604-53-4 E 290

Ferrosilicon (88% Si, 9% Fe) 8049-17-0 E 800

Ferrotitanium (19% Ti, 74.1% Fe, 0.06% C) E CL 380

Flax shive G 230

Fumaric acid 110-17-8 G M 520

Garlic, dehydrated G NL 360

Gilsonite 12002-43-6 F 500

Green base harmon dye G 175

Guar seed G NL 500

Gulasonic acid, diacetone G NL 420

Gum, arabic G 260

Gum, karaya G 240

Gum, manila G CL 360

Gum, tragacanth 9000-65-1 G 260

Hemp hurd G 220

Hexamethylene tetramine 100-97-0 G S 410

Hydroxyethyl cellulose G NL 410

Iron, 98% H 2 reduced E 290

Iron, 99% carbonyl 13463-40-6 E 310

Isotoic anhydride G NL 700

L-sorbose G M 370

Lignin, hydrolized, wood-type, fine G NL 450

Lignite, California F 180

Lycopodium G 190

Malt barley G 250

Manganese 7439-96-5 E 240

Magnesium, grade B, milled E 430

Manganese vancide G 120

Mannitol 69-65-8 G M 460

Methacrylic acid polymer G 290

Methionine (l-methionine) 63-68-3 G 360


15 of 30 7/9/2014 3:22 PM


NEC


Temperature (°C)

Methyl cellulose G 340

Methyl methacrylate polymer 9011-14-7 G NL 440

Methyl methacrylate-ethyl acrylate G NL 440

Methyl methacrylate-styrene-

butadieneG NL 480

Milk, skimmed G 200

N,N-dimethylthio-

formamideG 230

Nitropyridone 100703-82-0 G M 430

Nitrosamine G NL 270

Nylon polymer 63428-84-2 G 430

Para-oxy-benzaldehyde 123-08-0 G CL 380

Paraphenylene diamine 106-50-3 G M 620

Paratertiary butyl benzoic acid 98-73-7 G M 560

Pea flour G 260

Peach pit shell G 210

Peanut hull G 210

Peat, sphagnum 94114-14-4 G 240

Pecan nut shell 8002-03-7 G 210

Pectin 5328-37-0 G 200

Pentaerythritol 115-77-5 G M 400

Petrin acrylate monomer 7659-34-9 G NL 220

Petroleum coke (more than 8% totalentrapped volatiles)

F

Petroleum resin 64742-16-1 G 500

Phenol formaldehyde 9003-35-4 G NL 580

Phenol formaldehyde, polyalkylene-p 9003-35-4 G 290

Phenol furfural 26338-61-4 G 310

Phenylbetanaphthylamine 135-88-6 G NL 680

Phthalic anydride 85-44-9 G M 650

Phthalimide 85-41-6 G M 630

Pitch, coal tar 65996-93-2 F NL 710

Pitch, petroleum 68187-58-6 F NL 630

Polycarbonate G NL 710

Polyethylene, high pressure process 9002-88-4 G 380

Polyethylene, low pressure process 9002-88-4 G NL 420

Polyethylene terephthalate 25038-59-9 G NL 500

Polyethylene wax 68441-04-8 G NL 400

Polypropylene (no antioxidant) 9003-07-0 G NL 420

Polystyrene latex 9003-53-6 G 500

Polystyrene molding compound 9003-53-6 G NL 560

Polyurethane foam, fire retardant 9009-54-5 G 390

Polyurethane foam, no fire retardant 9009-54-5 G 440

Polyvinyl acetate 9003-20-7 G NL 550


16 of 30 7/9/2014 3:22 PM


NEC


Temperature (°C)

Polyvinyl acetate/alcohol 9002-89-5 G 440

Polyvinyl butyral 63148-65-2 G 390

Polyvinyl chloride-dioctyl phthalate G NL 320

Potato starch, dextrinated 9005-25-8 G NL 440

Pyrethrum 8003-34-7 G 210

Rayon (viscose) flock 61788-77-0 G 250

Red dye intermediate G 175

Rice G 220

Rice bran G NL 490

Rice hull G 220

Rosin, DK 8050-09-7 G NL 390

Rubber, crude, hard 9006-04-6 G NL 350

Rubber, synthetic, hard (33% S) 64706-29-2 G NL 320

Safflower meal G 210

Salicylanilide 87-17-2 G M 610

Sevin 63-25-2 G 140

Shale, oil 68308-34-9 F

Shellac 9000-59-3 G NL 400

Sodium resinate 61790-51-0 G 220

Sorbic acid (copper sorbate or potash) 110-44-1 G 460

Soy flour 68513-95-1 G 190

Soy protein 9010-10-0 G 260

Stearic acid, aluminum salt 637-12-7 G 300

Stearic acid, zinc salt 557-05-1 G M 510

Styrene modified polyester-glass fiber 100-42-5 G 360

Styrene-acrylonitrile (70-30) 9003-54-7 G NL 500

Styrene-butadiene latex (>75% styrene) 903-55-8 G NL 440

Styrene-maleic anhydride copolymer 9011-13-6 G CL 470

Sucrose 57-50-1 G CL 350

Sugar, powdered 57-50-1 G CL 370

Sulfur 7704-34-9 G 220

Tantalum 7440-25-7 E 300

Terephthalic acid 100-21-0 G NL 680

Thorium (contains 1.2% O) 7440-29-1 E CL 270

Tin, 96%, atomized (2% Pb) 7440-31-5 E 430

Titanium, 99% Ti 7440-32-6 E CL 330

Titanium hydride (95% Ti, 3.8% H) 7704-98-5 E CL 480

Trithiobisdimethylthio-

formamideG 230

Tung, kernels, oil-free 8001-20-5 G 240

Urea formaldehyde molding compound 9011-05-6 G NL 460

Urea formaldehyde-phenol formaldehyde 25104-55-6 G 240

Vanadium, 86.4% 7440-62-2 E 490

Vinyl chloride-acrylonitrile copolymer 9003-00-3 G 470


17 of 30 7/9/2014 3:22 PM


NEC


Temperature (°C)

Vinyl toluene-acrylonitrile butadiene 76404-69-8 G NL 530

Violet 200 dye G 175

Vitamin B1, mononitrate 59-43-8 G NL 360

Vitamin C 50-81-7 G 280

Walnut shell, black G 220

Wheat G 220

Wheat flour 130498-22-5 G 360

Wheat gluten, gum 100684-25-1 G NL 520

Wheat starch G NL 380

Wheat straw G 220

Wood flour G 260

Woodbark, ground G 250

Yeast, torula 68602-94-8 G 260

Zirconium hydride 7704-99-6 E 270

Zirconium (contains 0.3% O) 7440-67-7 E CL 330

Notes:

(1) Normally, the minimum ignition temperature of a layer of a specific dust is lower than the minimumignition temperature of a cloud of that dust. Since this is not universally true, the lower of the two minimumignition temperatures is listed. If no symbol appears in the “Code” column, then the layer ignitiontemperature is shown. “CL” means the cloud ignition temperature is shown. “NL” means that no layerignition temperature is available, and the cloud ignition temperature is shown. “M” signifies that the dustlayer melts before it ignites; the cloud ignition temperature is shown. “S” signifies that the dust layersublimes before it ignites; the cloud ignition temperature is shown.

(2) Certain metal dusts might have characteristics that require safeguards beyond those required foratmospheres containing the dusts of aluminum, magnesium, and their commercial alloys. For example,zirconium and thorium dusts can ignite spontaneously in air, especially at elevated temperatures.

(3) Due to the impurities found in coal, its ignition temperatures vary regionally, and ignition temperaturesare not available for all regions in which coal is mined.



499_table_4.5.2_revised.rtf Table revision reflecting Combustible dust Zone groups


Table needs to be revised to reflect the Combustible Zone dusts, added with Section 5.2.2




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18 of 30 7/9/2014 3:22 PM

Table 4.5.2 Selected Combustible Materials

Chemical Name CAS No. Division Grp/

Zone Group

Code Layer or Cloud

Ignition Temp.

(°C)

Acetal, Linear G/IIIB NL 440

Acetoacet-p-phenetidide 122-82-7 G//IIIB NL 560

Acetoacetanilide 102-01-2 G//IIIB M 440

Acetylamino-t-nitrothiazole G//IIIB 450

Acrylamide Polymer G/IIIB 240

Acrylonitrile Polymer G//IIIB 460

Acrylonitrile-Vinyl Chloride-Vinylidenechloride copolymer

(70-20-10)

G//IIIB 210

Acrylonitrile-Vinyl Pyridine Copolymer G//IIIB 240

Adipic Acid 124-04-9 G//IIIB M 550

Alfalfa Meal G//IIIB 200

Alkyl Ketone Dimer Sizing Compound G//IIIB 160

Allyl Alcohol Derivative (CR-39) G//IIIB NL 500

Almond Shell G//IIIB 200

Aluminum, A422 Flake 7429-90-5 E/IIIC 320

Aluminum, Atomized Collector Fines E/IIIC CL 550

Aluminum—cobalt alloy (60-40) E/IIIC 570

Aluminum—copper alloy (50-50) E/IIIC 830

Aluminum—lithium alloy (15% Li) E/IIIC 400

Aluminum—magnesium alloy (Dowmetal) E/IIIC CL 430

Aluminum—nickel alloy (58-42) E/IIIC 540

Aluminum—silicon alloy (12% Si) E/IIIC NL 670

Amino-5-nitrothiazole 121-66-4 G/IIIB 460

Anthranilic Acid 118-92-3 G/IIIB M 580

Apricot Pit G/IIIB 230

Aryl-nitrosomethylamide G/IIIB NL 490

Asphalt 8052-42-4 F/IIIB 510

Aspirin [acetol (2)] 50-78-2 G/IIIB M 660

Azelaic Acid 109-31-9 G/IIIB M 610

Azo-bis-butyronitrile 78-67-1 G/IIIB 350

Benzethonium Chloride G/IIIB CL 380

Benzoic Acid 65-85-0 G/IIIB M 440

Benzotriazole 95-14-7 G/IIIB M 440

Beta-naphthalene-axo-dimethylaniline G/IIIB 175

Bis(2-hydroxy-5-chlorophenyl) Methane 97-23-4 G/IIIB NL 570

Bisphenol-A 80-05-7 G/IIIB M 570

Boron, Commercial Amorphous (85% B) 7440-42-8 E/IIIC 400

Calcium Silicide E/IIIC 540

Carbon Black (More Than 8% Total Entrapped Volatiles) F/IIIB

Carboxymethyl Cellulose 9000-11-7 G/IIIB 290

Carboxypolymethylene G/IIIB NL 520

Cashew Oil, Phenolic, Hard G/IIIB 180

Cellulose G/IIIB 260

Cellulose Acetate G/IIIB 340

Cellulose Acetate Butyrate G/IIIB NL 370

Cellulose Triacetate G/IIIB NL 430

Charcoal (Activated) 64365-11-3 F/IIIB 180

Charcoal (More Than 8% Total Entrapped Volatiles) F/IIIB

Cherry Pit G/IIIB 220

Chlorinated Phenol G/IIIB NL 570

Chlorinated Polyether Alcohol G/IIIB 460

Chloroacetoacetanilide 101-92-8 G/IIIB M 640

Chromium (97%) Electrolytic, Milled 7440-47-3 E/IIIC 400

Cinnamon G/IIIB 230

Citrus Peel G/IIIB 270

Coal, Kentucky Bituminous F/IIIB 180

Coal, Pittsburgh Experimental F/IIIB 170

Coal, Wyoming F/IIIB 180

Cocoa Bean Shell G/IIIB 370

Cocoa, Natural, 19% Fat G/IIIB 240

Coconut Shell G/IIIB 220

Coke (More Than 8% Total Entrapped Volatiles) F/IIIB

Cork G/IIIB 210

Corn G/IIIB 250

Corn Dextrine G/IIIB 370

Corncob Grit G/IIIB 240

Cornstarch, Commercial G/IIIB 330

Cornstarch, Modified G/IIIB 200

Cottonseed Meal G/IIIB 200

Coumarone-Indene, Hard G/IIIB NL 520

Crag No. 974 533-74-4 G/IIIB CL 310

Cube Root, South America 83-79-4 G/IIIB 230

Di-alphacumyl Peroxide, 40-60 on CA 80-43-3 G/IIIB 180

Diallyl Phthalate 131-17-9 G/IIIB M 480

Dicyclopentadiene Dioxide G/IIIB NL 420

Dieldrin (20%) 60-57-1 G/IIIB NL 550

Dihydroacetic Acid G/IIIB NL 430

Dimethyl Isophthalate 1459-93-4 G/IIIB M 580

Dimethyl Terephthalate 120-61-6 G/IIIB M 570

Dinitro-o-toluamide 148-01-6 G/IIIB NL 500

Dinitrobenzoic Acid G/IIIB NL 460

Diphenyl 92-52-4 G/IIIB M 630

Ditertiary-butyl-paracresol 128-37-0 G/IIIB NL 420

Dithane m-45 8018-01-7 G/IIIB 180

Epoxy G/IIIB NL 540

Epoxy-bisphenol A G/IIIB NL 510

Ethyl Cellulose G/IIIB CL 320

Ethyl Hydroxyethyl Cellulose G/IIIB NL 390

Ethylene Oxide Polymer G/IIIB NL 350

Ethylene-maleic Anhydride Copolymer G/IIIB NL 540

Ferbam™ 14484-64-1 G/IIIB 150

Ferromanganese, Medium Carbon 12604-53-4 E/IIIC 290

Ferrosilicon (88% Si, 9% Fe) 8049-17-0 E/IIIC 800

Ferrotitanium (19% Ti, 74.1% Fe, 0.06% C) E/IIIC CL 380

Flax Shive G/IIIB 230

Fumaric Acid 110-17-8 G/IIIB M 520

Garlic, Dehydrated G/IIIB NL 360

Gilsonite 12002-43-6 F/IIIB 500

Green Base Harmon Dye G/IIIB 175

Guar Seed G/IIIB NL 500

Gulasonic Acid, Diacetone G/IIIB NL 420

Gum, Arabic G/IIIB 260

Gum, Karaya G/IIIB 240

Gum, Manila G/IIIB CL 360

Gum, Tragacanth 9000-65-1 G/IIIB 260

Hemp Hurd G/IIIB 220

Hexamethylene Tetramine 100-97-0 G/IIIB S 410

Hydroxyethyl Cellulose G/IIIB NL 410

Iron, 98% H2 Reduced E/IIIC 290

Iron, 99% Carbonyl 13463-40-6 E/IIIC 310

Isotoic Anhydride G/IIIB NL 700

L-sorbose G/IIIB M 370

Lignin, Hydrolized, Wood-type, Fine G/IIIB NL 450

Lignite, California F/IIIB 180

Lycopodium G/IIIB 190

Malt Barley G/IIIB 250

Manganese 7439-96-5 E/IIIC 240

Magnesium, Grade B, Milled E/IIIC 430

Manganese Vancide G/IIIB 120

Mannitol 69-65-8 G/IIIB M 460

Methacrylic Acid Polymer G/IIIB 290

Methionine (l-methionine) 63-68-3 G/IIIB 360

Methyl Cellulose G/IIIB 340

Methyl Methacrylate Polymer 9011-14-7 G/IIIB NL 440

Methyl Methacrylate-ethyl Acrylate G/IIIB NL 440

Methyl Methacrylate-styrene-butadiene G/IIIB NL 480

Milk, Skimmed G/IIIB 200

N,N-Dimethylthio-formamide G/IIIB 230

Nitropyridone 100703-82-0 G/IIIB M 430

Nitrosamine G/IIIB NL 270

Nylon Polymer 63428-84-2 G/IIIB 430

Para-oxy-benzaldehyde 123-08-0 G/IIIB CL 380

Paraphenylene Diamine 106-50-3 G/IIIB M 620

Paratertiary Butyl Benzoic Acid 98-73-7 G/IIIB M 560

Pea Flour G/IIIB 260

Peach Pit Shell G/IIIB 210

Peanut Hull G/IIIB 210

Peat, Sphagnum 94114-14-4 G/IIIB 240

Pecan Nut Shell 8002-03-7 G/IIIB 210

Pectin 5328-37-0 G/IIIB 200

Pentaerythritol 115-77-5 G/IIIB M 400

Petrin Acrylate Monomer 7659-34-9 G/IIIB NL 220

Petroleum Coke (More Than 8% Total Entrapped Volatiles) F/IIIB

Petroleum Resin 64742-16-1 G/IIIB 500

Phenol Formaldehyde 9003-35-4 G/IIIB NL 580

Phenol Formaldehyde, Polyalkylene-p 9003-35-4 G/IIIB 290

Phenol Furfural 26338-61-4 G/IIIB 310

Phenylbetanaphthylamine 135-88-6 G/IIIB NL 680

Phthalic Anydride 85-44-9 G/IIIB M 650

Phthalimide 85-41-6 G/IIIB M 630

Pitch, Coal Tar 65996-93-2 F/IIIB NL 710

Pitch, Petroleum 68187-58-6 F/IIIB NL 630

Polycarbonate G/IIIB NL 710

Polyethylene, High Pressure Process 9002-88-4 G/IIIB 380

Polyethylene, Low Pressure Process 9002-88-4 G/IIIB NL 420

Polyethylene Terephthalate 25038-59-9 G/IIIB NL 500

Polyethylene Wax 68441-04-8 G/IIIB NL 400

Polypropylene (no antioxidant) 9003-07-0 G/IIIB NL 420

Polystyrene Latex 9003-53-6 G/IIIB 500

Polystyrene Molding Compound 9003-53-6 G/IIIB NL 560

Polyurethane Foam, Fire Retardant 9009-54-5 G/IIIB 390

Polyurethane Foam, No Fire Retardant 9009-54-5 G/IIIB 440

Polyvinyl Acetate 9003-20-7 G/IIIB NL 550

Polyvinyl Acetate/Alcohol 9002-89-5 G/IIIB 440

Polyvinyl Butyral 63148-65-2 G/IIIB 390

Polyvinyl Chloride-dioctyl Phthalate G/IIIB NL 320

Potato Starch, Dextrinated 9005-25-8 G/IIIB NL 440

Pyrethrum 8003-34-7 G/IIIB 210

Rayon (Viscose) Flock 61788-77-0 G/IIIB 250

Red Dye Intermediate G/IIIB 175

Rice G/IIIB 220

Rice Bran G/IIIB NL 490

Rice Hull G/IIIB 220

Rosin, DK 8050-09-7 G/IIIB NL 390

Rubber, Crude, Hard 9006-04-6 G/IIIB NL 350

Rubber, Synthetic, Hard (33% S) 64706-29-2 G/IIIB NL 320

Safflower Meal G/IIIB 210

Salicylanilide 87-17-2 G/IIIB M 610

Sevin 63-25-2 G/IIIB 140

Shale, Oil 68308-34-9 F/IIIB

Shellac 9000-59-3 G/IIIB NL 400

Sodium Resinate 61790-51-0 G/IIIB 220

Sorbic Acid (Copper Sorbate or Potash) 110-44-1 G/IIIB 460

Soy Flour 68513-95-1 G/IIIB 190

Soy Protein 9010-10-0 G/IIIB 260

Stearic Acid, Aluminum Salt 637-12-7 G/IIIB 300

Stearic Acid, Zinc Salt 557-05-1 G/IIIB M 510

Styrene Modified Polyester-Glass Fiber 100-42-5 G/IIIB 360

Styrene-acrylonitrile (70-30) 9003-54-7 G/IIIB NL 500

Styrene-butadiene Latex (>75% styrene) 903-55-8 G/IIIB NL 440

Styrene-maleic Anhydride Copolymer 9011-13-6 G/IIIB CL 470

Sucrose 57-50-1 G/IIIB CL 350

Sugar, Powdered 57-50-1 G/IIIB CL 370

Sulfur 7704-34-9 G/IIIB 220

Tantalum 7440-25-7 E/IIIC 300

Terephthalic Acid 100-21-0 G/IIIB NL 680

Thorium (contains 1.2% O) 7440-29-1 E/IIIC CL 270

Tin, 96%, Atomized (2% Pb) 7440-31-5 E/IIIC 430

Titanium, 99% Ti 7440-32-6 E/IIIC CL 330

Titanium Hydride (95% Ti, 3.8% H) 7704-98-5 E/IIIC CL 480

Trithiobisdimethylthio-formamide G/IIIB 230

Tung, Kernels, Oil-free 8001-20-5 G/IIIB 240

Urea Formaldehyde Molding Compound 9011-05-6 G/IIIB NL 460

Urea Formaldehyde-phenol Formaldehyde 25104-55-6 G/IIIB 240

Vanadium, 86.4% 7440-62-2 E/IIIC 490

Vinyl Chloride-acrylonitrile Copolymer 9003-00-3 G/IIIB 470

Vinyl Toluene-acrylonitrile Butadiene 76404-69-8 G/IIIB NL 530

Violet 200 Dye G/IIIB 175

Vitamin B1, Mononitrate 59-43-8 G/IIIB NL 360

Vitamin C 50-81-7 G/IIIB 280

Walnut Shell, Black G/IIIB 220

Wheat G/IIIB 220

Wheat Flour 130498-22-5 G/IIIB 360

Wheat Gluten, Gum 100684-25-1 G/IIIB NL 520

Wheat Starch G/IIIB NL 380

Wheat Straw G/IIIB 220

Wood Flour G/IIIB 260

Woodbark, Ground G/IIIB 250

Yeast, Torula 68602-94-8 G/IIIB 260

Zirconium Hydride 7704-99-6 E/IIIC 270

Zirconium (contains 0.3% O) 7440-67-7 E/IIIC CL 330

Notes:

1. Normally, the minimum ignition temperature of a layer of a specific dust is lower than the minimum ignition temperature

of a cloud of that dust. Since this is not universally true, the lower of the two minimum ignition temperatures is listed. If no

symbol appears in the “Code” column, then the layer ignition temperature is shown. “CL” means the cloud ignition

temperature is shown. “NL” means that no layer ignition temperature is available, and the cloud ignition temperature is

shown. “M” signifies that the dust layer melts before it ignites; the cloud ignition temperature is shown. “S” signifies that the

dust layer sublimes before it ignites; the cloud ignition temperature is shown.

2. Certain metal dusts may have characteristics that require safeguards beyond those required for atmospheres containing the

dusts of aluminum, magnesium, and their commercial alloys. For example, zirconium and thorium dusts may ignite

spontaneously in air, especially at elevated temperatures.

3. Due to the impurities found in coal, its ignition temperatures vary regionally and ignition temperatures are not available for

all regions in which coal is mined.

Public Input No. 26-NFPA 499-2014 [ Section No. 6.10 ]


19 of 30 7/9/2014 3:22 PM

6.10 Classification Diagrams

Revised Figures are provided under separate submittal under 'PowerPoint file "NFPA 499dbw06242014' and include figures 6 . 10 (a) - (i) and new Zone Figures 6.11 (a)- (i)


20 of 30 7/9/2014 3:22 PM

Revise sentence

The classification diagrams shown in Figure 6.10(a) through Figure 6.10(i) and Figure 6.11(a) through

Figure 6.11(I) assume that the specific particle density is greater than 641 kg/m3 (40 lb/ft3).

Figure 6.10(a) Group F or Group G Dust — Indoor, Unrestricted Area; Open or Semi-EnclosedOperating Equipment.

Figure 6.10(b) Group E Dust — Indoor, Unrestricted Area; Open or Semi-Enclosed OperatingEquipment.


21 of 30 7/9/2014 3:22 PM

Figure 6.10(c) Group F or Group G Dust — Indoor, Unrestricted Area; Operating EquipmentEnclosed; Area Classified as a Class II, Division 2 Location.

Figure 6.10(d) Group F or Group G Dust — Indoor, Unrestricted Area; Operating EquipmentEnclosed; Area is an Unclassified Location.


22 of 30 7/9/2014 3:22 PM

Figure 6.10(e) Groups E, F, or G Dusts — Storage Area Bags, Drums, or Closed Hoppers.

Figure 6.10(f) Group E Dust — Indoor, Walled-Off Area; Operating Equipment Enclosed.


23 of 30 7/9/2014 3:22 PM

Figure 6.10(g) Group F or Group G Dust — Indoor, Walled-Off Area; Operating Equipment Open orSemi-Enclosed.

Figure 6.10(h) Group F or Group G Dust — Indoor, Walled-Off Area; Multiple Pieces of OperatingEquipment.

Figure 6.10(i) Group F or Group G Dust — Indoor, Unrestricted Area; Ventilated Bagging Head.




24 of 30 7/9/2014 3:22 PM

499_figures_10_a_to_i_and_11_a_to_i_dbw06242014.docxNFPA revised figures section 6.10 (a) thru (I) and 6.11 (a) thru (I) file word dbw06242014


The revised figures include a new figure section to address Zone combustible dusts which are based directly under existing Figure 6.10 series.Dimensions have been revised to reflect soft conversions (20 feet is about 6 m and not 6.1 m).Figure 6.10 f, g and h have been revised to reflect that if a self closing door is kept closed and that exterior side is 'unclassified' then the exterior side of an open door would then be Division 1; and adjacent to the Division 1 area would normally be a Division 2 area. Alternatively if that location were Division 2, then the Division 2 would be on the exterior side of that open door.The Figures were also revised to reflect that the extent through the door extends from door jamb to door jamb and is not centered at the center of the door as the figures seem to suggest.




Street Address:

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25 of 30 7/9/2014 3:22 PM

Revise as shown in red

3 m (10 ft)

6 m (20 ft)

3 m (10 ft)


6 m (20 ft)

3 m (10 ft) 3 m (10 ft)

3 m (10 ft)


Revise as shown in red- No Changes presented

Revise as shown in red- No Changes presented

Div. 1 - 1 m ( 3ft) Div. 2 - 3 m (10 ft)

Open door or frequently opened door

Self-closing door kept closed



Div. 1 - 1 m ( 3ft) Div. 2 - 3 m (10 ft)

Revise as shown in red/blue


Div. 2

3 m (10 ft)



3 m (10 ft) 3 m (10 ft)

3 m (10 ft) 3 m (10 ft)


Figure 6.11 (a) Zone Group IIIB Dust – Indoor, Unrestricted Area;

Open or Semi-Enclosed Operating Equipment



6 m (20 ft)

Zone 21 Zone 22

Figure 6.11 (b) Zone Group IIIC Dust – Indoor, Unrestricted Area;

Open or Semi-Enclosed Operating Equipment

Zone 21 Zone 21

Zone 21

Zone 21 3 m (10 ft) 3 m (10 ft)

Figure 6.11 (c) Zone Group IIIB Dust – Indoor, Unrestricted Area;

Operating Equipment Enclosed; Area Classified as a Class II, Zone 22 Location

Zone 21

Zone 21

Zone 22

Zone 22

3 m (10 ft)


Zone 21 Zone 22

Figure 6.11 (d) Zone Group IIIB Dust – Indoor, Unrestricted Area;

Operating Equipment Enclosed; Area is an Unclassified Location


Figure 6.11 (e) Zone Group IIIC or IIIB Dust – Storage Area; Bags, Drums or Closed Hoppers.


Zone 21 Zone 22

Figure 6.11 (f) Zone Group IIIC Dust – Indoor, Walled-Off Area; Operating Equipment Enclosed;

Zone 21 - 1 m ( 3ft) Zone 22 - 3 m (10



Zone 21 Zone 22

Minimize Zone 21 cutoff volume and area



Zone 21 - 1 m ( 3ft) Zone 22 - 3 m (10 ft)

Figure 6.11 (g) Zone Group IIIB Dust – Indoor, Walled-Off Area; Operating Equipment Open or Semi- Enclosed

Zone 21 Zone 22

Zone 21 Zone 22



Zone 22

3 m (10 ft)


Figure 6.11 (h) Zone Group IIIB Dust – Indoor, Walled-Off Area; Multiple Pieces of Operating Equipment

Zone 21 Zone 22

Zone 22 Zone 21

6 m (20 ft)


Figure 6.11 (i) Zone Group IIIB Dust – Indoor, Unrestricted Area; Ventilated Bagging Head

Zone 21 Zone 22

Zone 22 Zone 21

3 m (10 ft) 3 m (10 ft)

3 m (10 ft) 3 m (10 ft)


Public Input No. 31-NFPA 499-2014 [ Section No. A.3.3.3 ]

A.3.3.3 Combustible Dust.

Combustible dust includes particles in the solid phase and not those in a gaseous or liquid phase and caninclude hollow particles. Dust that can accumulate on equipment and includes particles of 500 microns orsmaller (material passing a U.S. No. 35 Standard Sieve) should be considered to present a dust fire or dustexplosion hazard unless testing shows otherwise. (See ASTM E 1226, Standard Test Method forExplosibility of Dust Clouds, or ISO 6184–1, Explosion protection systems — Part 1: Determination ofexplosion indices of combustible dust in air.)

Prior to the 1981 edition of NFPA 70, National Electrical Code (NEC) (1978 and prior editions), all Group Edusts (metal dusts such as aluminum, magnesium, and their commercial alloys) and Group F dusts(carbonaceous dusts such as carbon black, charcoal, or coke dusts having more than 8 percent totalvolatile materials) were considered to be electrically conductive. As a result, areas containing Group E orGroup F dusts were all classified Division 1, as required by the definition of a Class II, Division 1 location. Itwas possible to have a Division 2 location only for Group G dusts.

The 1984 edition of the NEC eliminated Group F altogether. Carbonaceous dusts with resistivity of less

than 105 ohm-cm were considered conductive and were classified as Group E. Carbonaceous dusts with

resistivity of 105 ohm-cm or greater were considered nonconductive and were classified as Group G. Thisreclassification allowed the use of Group G, Division 2 electrical equipment for many carbonaceousmaterials.

The 1987 edition of the NEC reinstated Group F because the close tolerances in Group E motorsnecessary for metal dusts are unnecessary for conductive carbonaceous dusts, and the low temperaturespecifications in Group G equipment necessary for grain, flour, and some chemical dusts are unnecessaryfor nonconductive carbonaceous dusts. This imposed an unwarranted expense on users. This changeallowed the use of Group F, Division 2 electrical equipment for carbonaceous dust with a resistivity greater

than 105 ohm-cm.

The problem with this work was that the resistivity value, a number that related to the dust's ability toconduct an electric current, was not a constant and varied considerably based on dust particle size andextent of oxidation, the moisture content, voltage applied, temperature, and test apparatus and technique.No standardized test method for the resistivity value considering long-term environmental effects has beendeveloped. Finally, the resistivity value is not directly related to the explosion hazard.

The 1990 edition of the NEC removed the low-temperature consideration for Group G.

Add the following new text:

Action taken under the 2014 NEC (NFPA 70) Article 506 introduced Combustible Dust Material Groups forZones. While it had been established by the NFPA Standards Council that NFPA 499 was responsible forpopulating the Material Groups established within the NEC, action was independently taken by NEC CMP14 to both define and populate the Combustible dust Materials established. With the action taken by theNEC to define Zone Combustible Material dust groups, NFPA 499 has correctly identified that for a givencombustible dust under the scope of NFPA 499, that Group IIIC and Group E are the same, and Group IIIBand Groups F and G are the same, although the historical use of Group F for Class II-Divisions has beenretained as an acceptable practice. The Scope of NFPA 499 does not address ignitable fibers and flyingmaterials which the NEC addresses in Article 503 as Class III.


The justification is self- explanatory within the new texts. However, in summary:1) NEC Article 506 addressing Group IIIC - Combustible Metal Dust and Informational note that Group IIIC is equivalent to Class II, Group E when Group E is NOT Combustible metal dust per NFPA 484, but rather Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similar hazards in the use of electrical equipment2) NEC Article 506 addressing Group IIIB- Combustible dusts other than combustible metal dust and the


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informational note that Group IIIB is equivalent to Class II, Groups F and G because of the issue about combustible metal dust more correctly needs to read Atmospheres 1) containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke, for coal and coke dusts) or that have been sensitized by other materials so that they present an explosion hazard or 2) containing combustible dusts not included in Zone Group IIIC including flour, grain, wood, plastic, and chemicals.




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Public Input No. 32-NFPA 499-2014 [ Section No. A.3.3.4.2 ]

A.3.3.4.2 Group F.

Remove the following existing text: Coal, carbon black, charcoal, and coke dusts are examples ofcarbonaceous dusts.

Replacment text as follows:

While coal, carbon black, charcoal and coke dusts are examples of carbonaceous dusts, only thoseatmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrappedvolatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal andCoke, for coal and coke dusts) are Class II, Group F.


The revised text better clarifies the difference between a carbonaceous combustible dust and a Group F combustible dust. The presence of volatiles is an important aspect not to be overlooked.




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Public Input No. 21-NFPA 499-2014 [ Chapter B ]

Annex B Informational References

B.1 Referenced Publications.

The documents or portions thereof listed in this annex are referenced within the informational sections ofthis recommended practice and are not part of the recommendations of this document unless also listed inChapter 2 for other reasons.

B.1.1 NFPA Publications.


NFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food ProcessingFacilities, 2013 edition .



NFPA 77, Recommended Practice on Static Electricity, 2007 edition 2014 .

NFPA 85, Boiler and Combustion Systems Hazards Code, 2011 edition .

NFPA 120, Standard for Fire Prevention and Control in Coal Mines, 2010 edition .

NFPA 484, Standard for Combustible Metals, 2012 edition 2015 ..

NFPA 654, Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing,and Handling of Combustible Particulate Solids, 2013 edition .

NFPA 655, Standard for Prevention of Sulfur Fires and Explosions, 2012 edition .

NFPA 664, Standard for the Prevention of Fires and Explosions in Wood Processing and WoodworkingFacilities, 2012 edition .

NFPA Fire Protection Guide to Hazardous Materials, 2010 edition.

B.1.2 Other Publications.

B.1.2.1 ASTM Publications.


ASTM E 1226, Standard Test Method for Explosibility of Dust Clouds, 2010.

B.1.2.2 ISO Publications.

International Organization for Standardization, 1 rue de Varembe, Case Postale 56, Ch-1211 Geneve 20,Switzerland.

ISO 6184–1, Explosion protection systems — Part 1: Determination of explosion indices of combustibledust in air, 1985.

B.1.2.3 National Academy of Sciences Publications.

National Materials Advisory Board, National Academy of Sciences, 500 Fifth Street, N.W., Washington, DC20001.

NMAB 353-3, Classification of Combustible Dusts in Accordance with the National Electrical Code, 1980.

B.2 Informational References.

The following documents or portions thereof are listed here as informational resources only. They are not apart of the recommendations of this document.

B.2.1 ASTM Publications.

ASTM International, 100 Barr Harbor Drive, P.O. Box C700,West Conshohocken, PA 19428-2959.



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B.2.2 Bureau of Mines Publications.

U.S. Government Printing Office, Washington, DC 20402.

RI 5624, Laboratory Equipment and Test Procedures for Evaluating Explosibility of Dusts, 1956.

RI 5753, Explosibility of Agricultural Dusts, 1957.

RI 5971, Explosibility of Dusts Used in the Plastics Industry, 1959.

RI 6516, Explosibility of Metal Powders, 1965.

RI 6597, Explosibility of Carbonaceous Dust, 1965.

RI 7009, Minimum Ignition Energy and Quenching Distance in Gaseous Mixture, 1970.

RI 7132, Dust Explosibility of Chemicals, Drugs, Dyes, and Pesticides, 1971.

RI 7208, Explosibility of Miscellaneous Dusts, 1972.

B.2.3 National Academy of Sciences Publications.

National Materials Advisory Board, National Academy of Sciences, 500 Fifth Street, N.W., Washington, DC20001.

NMAB 353-1, Matrix of Combustion-Relevant Properties and Classifications of Gases, Vapors, andSelected Solids, 1979.

NMAB 353-2, Test Equipment for Use in Determining Classifications of Combustible Dusts, 1979.

B.2.4 Other Publications.

Miron, Y., and C. P. Lazzara. “Hot Surface Ignition Temperatures of Dust Layers.” Fire and Materials 12:1988; 115–126.

B.3 References for Extracts in Informational Sections.




Referenced current editions.



Public Input No. 20-NFPA 499-2014 [Chapter 2] Referenced current editions.




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