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ExplosivE Gas atmosphErEs Class i Division systEmIncludes flammable gases, flammable liquid-produced vapors, and combustible liquid-produced vapors

Division 2:Whereignitableconcentrationsofflammablegases,vaporsorliquidsare not likely to existundernormaloperatingconditions.

Zone 2:Whereignitableconcentrationsofflammablegases,vaporsorliquidsare not likely to exist undernormaloperatingconditions.

groups

Division 1 and 2:A acetyleneB hydrogen C ethyleneD propane

Zone 0, 1 and 2:IIC acetylene&hydrogenIIB+H2 hydrogenIIB ethyleneIIA propane

Temperature Classifications

Division 1 and 2: Zone 0, 1 and 2:T1 ≤450°C T1 ≤450°CT2 ≤300°C T2 ≤300°CT2A ≤280°C —T2B ≤260°C —T2C ≤230°C —T2D ≤215°C —T3 ≤200°C T3 ≤200°CT3A ≤180°C —T3B ≤165°C —T3C ≤160°C —T4 ≤135°C T4 ≤135°CT4A ≤120°C —T5 ≤100°C T5 ≤100°CT6 ≤ 85°C T6 ≤ 85°C

Area Classification

Division 1:Whereignitableconcentrationsofflammablegases,vaporsorliquidscan exist all of the time or some of the time undernormaloperatingconditions.

Zone 0:Whereignitableconcentrationsofflammablegases,vaporsorliquidsare present continuously or for long periods of time undernormaloperatingconditions.

Zone 1:Whereignitableconcentrationsofflammablegases,vaporsorliquidsare likely to exist undernormaloperatingconditions.

Division System Electrical Equipment Protection Techniques

Applicable Certification Documents

Area Protection Techniques USA Canada

div. 1 •Intrinsicsafety UL913 CSA157

•Explosionproof UL1203 CSA30

•Purged/pressurized(TypeXorY) NFPA496 NFPA496

•AnyClassI,Zone0technique SeeZone0techniques SeeZone0techniques

div. 2 •Hermetically-sealed ISA12.12.01 CSA213

•Nonincendive ISA12.12.01 CSA213

•Non-sparking ISA12.12.01 CSA213

•Purged/pressurized(TypeZ) NFPA496 NFPA496

•Sealed ISA12.12.01 CSA213

•AnyClassI,Division1technique Seeabove Seeabove

•AnyClassI,Zone0,1or2technique SeeZonetechniques SeeZonetechniques

Note:ClassI,Division1intrinsicallysafesystemrequirementsarecontainedinUL913(USA)andCSA157(Canada).

ExplosivE Gas atmosphErEs Class i Division systEmIncludes flammable gases, flammable liquid-produced vapors, and combustible liquid-produced vapors

Zone System Electrical Equipment Protection Techniques (Equipment Protection Levels)

Protection Techniques

Applicable Certification Documents

Area (Equipment Protection Levels) USA (UL Mark) Canada (cUL Mark) IECEx System Europe (ATEX)

Zone 0 •Flameproof,“da”(Ga) — — IEC60079-1 EN60079-1

•Intrinsicsafety,“ia”(Ga) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulation,“ma”(Ga) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•ClassI,Div1intrinsicsafety UL913 CSA157 — —

Zone 1 •Flameproof,“db”(Gb) UL60079-1 CSA60079-1 IEC60079-1 EN60079-1

•Pressurization,“pxb”/“pyb”(Gb) UL60079-2 CSA60079-2 IEC60079-2 EN60079-2

•Powderfilling,“q”(Gb) UL60079-5 CSA60079-5 IEC60079-5 EN60079-5

•Oilimmersion,“o”(Gb) UL60079-6 CSA60079-6 IEC60079-6 EN60079-6

•Increasedsafety,“e”(Gb) UL60079-7 CSA60079-7 IEC60079-7 EN60079-7

•Intrinsicsafety,“ib”(Gb) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulation,“mb”(Gb) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•AnyZone0technique Seeabove Seeabove Seeabove Seeabove

•AnyClassI,Div1technique SeeCID1techniques SeeCID1techniques — —

Zone 2 •Flameproof,“dc”(Gc) — — IEC60079-1 EN60079-1

•Pressurization,“pzc”(Gc) UL60079-2 CSA60079-2 IEC60079-2 EN60079-2

•Intrinsicsafety,“ic”(Gc) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulated,“nC”(Gc) — CSA60079-15 — —

•Enclosed-break,“nC”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Energy-limited,“nL”(Gc) — CSA60079-15 — —

•Hermetically-sealed,“nC”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Nonincendive,“nC”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Non-sparking,“nA”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Restrictedbreathing,“nR”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Sealed,“nC”(Gc) UL60079-15 CSA60079-15 IEC60079-15 EN60079-15

•Encapsulation,“mc”(Gc) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•AnyZone0or1technique Seeabove Seeabove Seeabove Seeabove

•AnyClassI,Div1or2technique SeeClassItechniques SeeClassItechniques — —

Note1: Zone0,1and2generalrequirementsarecontainedinUL60079-0(USA),CSA60079-0(Canada)andIEC/EN60079-0(IECExSystem&Europe).

Note2: Zone0,1and2intrinsicallysafesystemrequirementsarecontainedinISA60079-25(USA),CSA60079-25(Canada)andIEC/EN60079-25(IECExSystem&Europe).

Note3: SpecialrequirementsforcertainequipmentinstallationsinZone0(Ga)areasarecontainedinISA60079-26(USA)andIEC/EN60079-26(IECExSystem&Europe).

Note4: EquipmentProtectionLevels(EPLs)areusedtoprovideadditionaldetailsregardingthelevelofprotectionagainstignitioninexplosiveatmospheres.EPLsaredesignatedbyaletter“G”forGas,“D”forDustor“M”forMining,followedbyaletter“a”for“veryhigh”,“b”for“high”or“c”for“enhanced”levelofprotection.

Note5: UndertheATEXDirective(94/9/ECand2014/34/EU),themarkingofCategoriesisadditionallyrequired.ATEXCategoriesaresimilartoEPLsinfunctionanddesignationasfollows,ATEXCategory1G,2G,3G,1D,2D,3D,M1,M2=EPLGa,Gb,Gc,Da,Db,Dc,Ma,Mbrespectively.

Note6: INMETROcertificationrequirementsaredeterminedbyPortaria179asof18May2010,withtheassociatedBrazilianNBRExstandardsharmonizedwiththecomparableIECExstandardsnotedabove.

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Zone System Non-Electrical Equipment Protection Techniques (Equipment Protection Levels)

Applicable Certification Documents

Area Protection Techniques USA (UL Mark) Canada (cUL Mark) IECEx System Europe (ATEX)

Zone 0 •Constructionalsafety,“c”(Ga) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Ga) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Ga) — — ISOpr80079-37 EN13463-8

Zone 1 •Flameproof,“d”(Gb) — — IEC60079-1 EN13463-3

•Constructionalsafety,“c”(Gb) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Gb) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Gb) — — ISOpr80079-37 EN13463-8

•Pressurization,“px”/“py”(Gb) — — IEC60079-2 EN60079-2

•AnyZone0technique — — Seeabove Seeabove

Zone 2 •Flowrestrictingenclosure,“fr” — — — EN13463-2

•Constructionalsafety,“c”(Gc) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Gc) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Gc) — — ISOpr80079-37 EN13463-8

•Pressurization,“pz”(Gc) — — IEC60079-2 EN60079-2

•AnyZone0or1technique — — Seeabove Seeabove

Note1: TheISOpr80079seriesstandardsaretobepublishedbyQ3of2015,withanincludedreferencetoIEC60079-0.

Note2: Zone0,1and2generalrequirementsarecontainedinISO/IECpr80079-36(IECExSystem)andEN13463-1(Europe).

Note3: EquipmentProtectionLevels(EPLs)areusedtoprovideadditionaldetailsregardingthelevelofprotectionagainstignitioninexplosiveatmospheres.EPLsaredesignatedbyaletter“G”forGas,“D”forDustor“M”forMining,followedbyaletter“a”for“veryhigh”,“b”for“high”or“c”for“enhanced”levelofprotection.

Note4: UndertheATEXDirective(94/9/ECand2014/34/EU),themarkingofCategoriesisadditionallyrequired.ATEXCategoriesaresimilartoEPLsinfunctionanddesignationasfollows,ATEXCategory1G,2G,3G,1D,2D,3D,M1,M2=EPLGa,Gb,Gc,Da,Db,Dc,Ma,Mbrespectively.

ExplosivE Gas atmosphErEs Class i Division systEmIncludes flammable gases, flammable liquid-produced vapors, and combustible liquid-produced vapors

Continued

ExplosivE Dust atmosphErEs Class ii & iii Division systEmIncludes combustible dusts and ignitable fibers/flyings

Class II, Division 2:Whereignitableconcentrationsofcombustibledustare not likely to existundernormaloperatingconditions.

Zone 22:Whereignitableconcentrationsofcombustibledustorignitablefibers/flyingsare not likely to exist undernormaloperatingconditions.

Class III, Division 1:Whereeasilyignitablefibersormaterialsproducingcombustibleflyingsare handled, manufactured or used.

Class III, Division 2:Whereeasilyignitablefibersare stored or handled.

Zone 20, 21 and 22: None.Note:ForZone20,21and22,equipmentshallbemarkedtoshowthemaximumsurfacetemperature

Class III, Division 1 and 2: None.Note:Article503oftheNEClimitsthemaximumsurfacetemperatureforClassIIIequipmentto165°Cforequipmentnotsubjecttooverloadingandto120°Cforequipmentthatmaybeoverloaded.

Class III, Division 1 and 2: None.

groups

Class II, Division 1 and 2:E metaldust—Div.1onlyF carbonaceousdustg non-conductivedust—

Zone 20, 21 and 22:IIIC conductivedustIIIB non-conductivedustIIIB non-conductivedustIIIA combustibleflyings

Temperature Classifications

Class II, Division 1 and 2:T1 ≤450°CT2 ≤300°CT2A ≤280°CT2B ≤260°CT2C ≤230°C

T2D ≤215°CT3 ≤200°CT3A ≤180°CT3B ≤165°CT3C ≤160°C

T4 ≤135°CT4A ≤120°CT5 ≤100°CT6 ≤85°C

Area Classification

Class II, Division 1:Whereignitableconcentrationsofcombustibledustcan exist all of the time or some of the timeundernormaloperatingconditions.

Zone 20:Whereignitableconcentrationsofcombustibledustorignitablefibers/flyingsare present continuously or for long periods of time undernormaloperatingconditions.

Zone 21:Whereignitableconcentrationsofcombustibledustorignitablefibers/flyingsare likely to exist undernormaloperatingconditions.

ExplosivE Dust atmosphErEs Class ii & iii Division systEmIncludes combustible dusts and ignitable fibers/flyings

Division System Electrical Equipment Protection Techniques

Applicable Certification Documents

Area Protection Techniques USA Canada

div. 1 •Intrinsicsafety(ClassII&III) UL913 CSA157

•Dust-ignitionproof(ClassII) UL1203 CSA25

•Pressurized(ClassII) NFPA496 NFPA496

•Dusttight(ClassIII) ISA12.12.01 CSA157

•Hermetically-sealed(ClassIII) ISA12.12.01 —

•Nonincendive(ClassIII) ISA12.12.01 —

•Sealed(ClassIII) ISA12.12.01 —

•AnyZone20technique(ClassII&III) SeeZone20techniques SeeZone20techniques

div. 2 •Dusttight(ClassII) ISA12.12.01 CSA157

•Hermetically-sealed(ClassII) ISA12.12.01 —

•Nonincendive(ClassII) ISA12.12.01 —

•Sealed(ClassII) ISA12.12.01 —

•Pressurized(ClassII) NFPA496 NFPA496

•AnyCIID1orCIIID1technique Seeabove Seeabove

•AnyZone20,21,22tech(ClassII&III) SeeZonetechniques SeeZonetechniques

Note:ClassIIandClassIII,Division1intrinsicallysafesystemrequirementsarecontainedinUL913(USA)andCSA157(Canada)

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Zone System Electrical Equipment Protection Techniques (Equipment Protection Levels)

Protection Techniques

Applicable Certification Documents

Area (Equipment Protection Levels) USA (UL Mark) Canada (cUL Mark) IECEx System Europe (ATEX)

Zone 20 •Enclosure,“ta”(Da) ISA60079-31 CSA60079-31 IEC60079-31 EN60079-31

•Intrinsicsafety,“ia”(Da) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulation,“ma”(Da) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•AnyCIID1technique SeeCIID1techniques SeeCIID1techniques — —

Zone 21 •Enclosure,“tb”(Db) ISA60079-31 CSA60079-31 IEC60079-31 EN60079-31

•Pressurization,“p”(Db) ISA61241-2 CSA61241-4 IEC60079-2 EN60079-2

•Intrinsicsafety,“ib”(Db) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulation,“mb”(Db) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•AnyZone20technique Seeabove Seeabove Seeabove Seeabove

•AnyCIID1technique SeeCIID1techniques SeeCIID1techniques — —

Zone 22 •Enclosure,“tc”(Dc) ISA60079-31 CSA60079-31 IEC60079-31 EN60079-31

•Pressurization,“p”(Dc) ISA61241-2 CSA61241-4 IEC60079-2 EN60079-2

•Intrinsicsafety,“ic”(Dc) UL60079-11 CSA60079-11 IEC60079-11 EN60079-11

•Encapsulation,“mc”(Dc) UL60079-18 CSA60079-18 IEC60079-18 EN60079-18

•AnyZone20,21technique Seeabove Seeabove Seeabove Seeabove

•AnyCIID1,CIID2technique SeeClassIItechniques SeeClassIItechniques — —

Note1: Zone20,21and22generalrequirementsarecontainedinUL60079-0orISA61241-0(USA),CSA60079-0(Canada)andIEC/EN60079-0(IECExSystem&Europe).

Note2: Zone20,21and22intrinsicallysafesystemrequirementsarecontainedinISA60079-25(USA),CSA60079-25(Canada)andIEC/EN60079-25(IECExSystem&Europe).

Note3: EquipmentProtectionLevels(EPLs)areusedtoprovideadditionaldetailsregardingthelevelofprotectionagainstignitioninexplosiveatmospheres.EPLsaredesignatedbyaletter“G”forGas,“D”forDustor“M”forMining,followedbyaletter“a”for“veryhigh”,“b”for“high”or“c”for“enhanced”levelofprotection.

Note4: UndertheATEXDirective(94/9/ECand2014/34/EU),themarkingofCategoriesisadditionallyrequired.ATEXCategoriesaresimilartoEPLsinfunctionanddesignationasfollows,ATEXCategory1G,2G,3G,1D,2D,3D,M1,M2=EPLGa,Gb,Gc,Da,Db,Dc,Ma,Mbrespectively.

Note5: INMETROcertificationrequirementsaredeterminedbyPortaria179asof18May2010,withtheassociatedBrazilianNBRExstandardsharmonizedwiththecomparableIECExstandardsnotedabove.

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Zone System Non-Electrical Equipment Protection Techniques (Equipment Protection Levels)

Applicable Certification Documents

Area Protection Techniques USA (UL Mark) Canada (cUL Mark) IECEx System Europe (ATEX)

Zone 20 •Constructionalsafety,“c”(Da) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Da) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Da) — — ISOpr80079-37 EN13463-8

•Enclosure,“ta”(Da) — — IEC60079-31 EN60079-31

Zone 21 •Constructionalsafety,“c”(Db) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Db) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Db) — — ISOpr80079-37 EN13463-8

•Flameproof,“d”(Db) — — IEC60079-1 EN13463-3

•Pressurization,“px”/“py”(Db) — — IEC60079-2 EN60079-2

•Enclosure,“tb”(Db) — — IEC60079-31 EN60079-31

•AnyZone20technique — — Seeabove Seeabove

Zone 22 •Flowrestrictingenclosure,“fr” — — — EN13463-2

•Constructionalsafety,“c”(Dc) — — ISOpr80079-37 EN13463-5

•Controlofignitionsource,“b”(Dc) — — ISOpr80079-37 EN13463-6

•Liquidimmersion,“k”(Dc) — — ISOpr80079-37 EN13463-8

•Pressurization,“pz”(Dc) — — IEC60079-2 EN60079-2

•Enclosure,“tc”(Dc) — — IEC60079-31 EN60079-31

•AnyZone20or21technique — — Seeabove Seeabove

Note1:TheISOpr80079seriesstandardsaretobepublishedbyQ3of2015,withanincludedreferencetoIEC60079-0.

Note2: Zone20,21and22generalrequirementsarecontainedinISO/IECpr80079-36(IECExSystem)andEN13463-1(Europe).

Note3: EquipmentProtectionLevels(EPLs)areusedtoprovideadditionaldetailsregardingthelevelofprotectionagainstignitioninexplosiveatmospheres.EPLsaredesignatedbyaletter“G”forGas,“D”forDustor“M”forMining,followedbyaletter“a”for“veryhigh”,“b”for“high”or“c”for“enhanced”levelofprotection.

Note4: UndertheATEXDirective(94/9/ECand2014/34/EU),themarkingofCategoriesisadditionallyrequired.ATEXCategoriesaresimilartoEPLsinfunctionanddesignationasfollows,ATEXCategory1G,2G,3G,1D,2D,3D,M1,M2=EPLGa,Gb,Gc,Da,Db,Dc,Ma,Mbrespectively.

ExplosivE Dust atmosphErEs Class ii & iii Division systEmIncludes combustible dusts and ignitable fibers/flyings

Continued

MARkINgSClass I, II, and III, Division 1 & 2 (USA & Canada)

This marking would include:Class(es),Division(s),Gas/DustGroup(s),TemperatureClassification

Example: ClassI,Division1,GroupsC&D;ClassII,Division1,GroupsE,FandG;ClassIII,Division1,T4A

Class I, Zone 0, 1, & 2 (USA)

The marking would include:ForZoneListingsbasedonUSA60079seriesstandards:Class,Zone,AEx,ProtectionTechnique(s),GasGroup,TemperatureClassification

Example: ClassI,Zone1,AExdeIIBT4

ForZoneListingsbasedonUSADivisionstandards:Class,Zone,GasGroup,TemperatureClassification

Example: ClassI,Zone1,GroupIIBT4

Zone 20, 21, & 22 (USA)

The marking would include:ForZoneListingsbasedonUSA60079or61241seriesstandards:Zone,AEx,ProtectionTechnique(s),DustGroup,TemperatureClassification

Example: Zone21,AExtbIIIBT135°C

ForZoneListingsbasedonUSADivisionStandards:Zone,DustGroup,TemperatureClassification

Example: Zone21,IIIBT135°C

Zone 0, 1 & 2 (Canada)Zone 20, 21 & 22 (Canada)

This marking would include:ForZone0,1&2Listings:Ex,ProtectionTechnique(s),GasGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExdeIIBT4Gb

ForZone20,21&22Listings:Ex,ProtectionTechnique(s),DustGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExtbIIIBT135°CDb

Zone 0, 1, & 2 (Europe)

This marking would include:ElectricalEquipment:Ex,ProtectionTechnique(s),GasGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExdeIIBT4Gb

Non-ElectricalEquipment:GasGroup,ProtectionTechnique(s),TemperatureClassification

Example: IIBckT4

Zone 20, 21, & 22 (Europe)

This marking would include:ElectricalEquipment:Ex,ProtectionTechnique(s),DustGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExtbIIIBT135°CDb

Non-ElectricalEquipment:ProtectionTechnique(s),TemperatureClassification

Example: ckT135°C

ATEX Directive (Europe)

In addition to the European Ex marking strings noted to the left, this marking would include:Non-mining: ,NBIdentifier,

,EquipmentGroup&Category,G(gas)/D(dust),DateCode

Example (for DEMkO): 0539II2G2013

Mining: ,NBIdentifier, ,EquipmentGroup&Category,DateCode

Example (for DEMkO): 0539IM22013

Zone 0, 1, & 2 (IECEx System)

This marking would include:

ElectricalEquipment:Ex,ProtectionTechnique(s),GasGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExdeIIBT4Gb

Non-ElectricalEquipment:Ex,ProtectionTechnique,GasGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example:ExhIIBT4Gb

Zone 20, 21, & 22 (IECEx System)

This marking would include:ElectricalEquipment:Ex,ProtectionTechnique(s),DustGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExtbIIIBT135°CDb

Non-ElectricalEquipment:Ex,ProtectionTechnique(s),DustGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example:ExhIIIBT135°CDb

INMETRO Mark (Brazil)

This marking would include:INMETRO/UL-BRMark,Ex,ProtectionTechnique(s),GasGroup,TemperatureClassification,EquipmentProtectionLevel(EPL)

Example: ExdeIIBT4Gb