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ANSI C29.3-1986
for wet process porcelain insulators -spool type
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A N S I @C29.3-1986
Revis ion ofANSI C29.3-I980
American National Standard
for Wet Process Porcelain Insulators -Spool Type
Secretar iat
National Electr ical Manufacturers Associat ion
Approved October 2,1986
Am erican Nation al Standards Inst i tute, Inc -
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American Approval of an American National Standard requires verification by ANSI that the re-quirements for due process, consensus, and ot her criteria for approval have been met by
Consensus is established when, in the judgment of the ANSI Board of Standards Review,
substantial agreement has been reached by directly and materially affected interests. Sub-stantial agreement means much more than a simple major ity, but n ot necessarily unanim-
ity , Consensus requires that all views and objections be considered, and that a concerted
effort be made toward their resolution.
The use of American National Standards is completely voluntary; their existence does notin any respect preclude anyon e, wheth er he has approved the standards or no t, from man-
ufacturing, marketing, purchasing. or using products , processes, or procedures not con-
forming t o the standards.
The American National Stand ards Institute does not develop standards and will in n o cir-
cumstances give an in terpretatio n of any American National S tandard . Moreover, no per-
son shall have th e right or author ity t o issue an interpreta tion of an American National
Standard in the name of the American National Standards Institute . Requests for inter-
pretation s should be addressed to the secretariat or sponsor whose nam e appears on the
title page of this standard.
CAUTION NOTICE: This American National S tandard may be revised or withdrawn a t
any time, The procedures of the American National Stan dards Institute require tha taction be take n t o reaffirm, revise, or withdraw this standard n o later than five years from
the dat e of approval. Purchasers of American National Standards may receive current infor-
mation on all standards by calling or writing the American National Stand ards Institute.
National the standards developer,
Standard
Published by
American National Standards Institute1430 Broadway, New York, New York 10018
Copyright O 1986 by American N ational Standards Institute, Inc
All rights reserved.
No part of this publication may be reproduced in any form,in an electronic retrieval system or otherwise, withou tth e prior written permission of the publisher.
Printed in the United Sta tes of America
AlM1186/7
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(ThisForeword is not part of Am erican National Standard C29.3-1986.)ForewordTh e first edition of this standard was issued in 1961 and was based essentially on the EEI-
NEMA (Edison Electric Institute-Na tional Electrical Man ufacturers Assoc iation) Sta n-
dards for Wet-Process Porcelain Insulators (Spool T ype), E EI T DJ-53, NEMA 141-1952 .
Subsequent revisions were developed by the American National Standards Comm ittee on
Insulators for Electric Power Lines, C29.
The principal differences between th e 1977 and 1961 editions were: a change of colorrequirements; addition of neck designations, dimensions, and tolerances; deletion of re-
quireme nts for manufacturer’s production sam pling and tests; and deletion of the state-
ment regarding certified test data with regard to design tests. In t he 1980 edition, all
values were converted from U.S customary units to SI units. The 1986 edition moves
Section 7, Packaging, to the Appendix.
Suggestions for im provement of this standard will be welcome. They should be sent t o
NationalElectricalManufacturersAssociation,2101L Street, NW ,Washington,DC 20037.
This standard was processed and approved for submittal to AN SI by A ccredited Standards
Com mittee o n Insulators for Electric Pow er Lines, C29. Com mittee approval of t he stan-
dard does n ot necessarily imply th at all comm ittee members voted for its approval.A t
the time it approved thisstandard, the C 29 Com mittee had the following members:
Olin Compton , Chair
Joh n A. G authier, Secretary
Organization Represented Name ofRepresentative
Bonneville Power Ad ministration. . . . . . . . . . . . . . . . . . . . . . . . . . Robert L.BrownElectric Light and Power Group. . . . . . . . . . . . . . . . . . . . . . . . . . . G. A. Cook
A. S. JagtianiJ. F. KarcherE. F. MarchbankJ. WeberD. E. Soffrin (Ait)
Institute of Electrical and Electronics Engineers . . . . . . . . . . . . . . . . . O. ComptonT.A. PinkhamW. . RichardN. E. Spaulding (Ait)
National E lectrical Manufacturers Association . . . . . . . . . . . . . . . . . . A. C . BakerJ.W. arterR. HarapR.HarmonB. E. KingsburyJ. L.Nicho&J. D. SakichA. E. SchwalmH. V an Herk (Ait)
U.S.Department of the Army. . . . . . . . . . . . . . . . . . . . . . . . . . . . H. Snyder
Individiral Memb er
G . A. Davidson
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PAGEContents SEmloN
1 . S c o p e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 . Referenced American National Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6 . Dimensions and Characteristics 5
7.Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8. Sampling, Inspectio n. and Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.2 DesignTests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.2.1 Low-Frequ ency Dry Flashover Test . . . . . . . . . . . . . . . . . . . . . . . . . 68.2.2 Low-Frequ ency Wet Flashover Test . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.3 Quality Conformance Tes ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.3.1 Dimensional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.3.2 Visual Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.3.3 Porosity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.3.4 Transverse.StrengthTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1 Neck D esignations and D imensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figures
Figure 1 Spool Insulator. Class 53-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure3 SpoolInsulator.Class53-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2 Spo ol Insulator. Class 53-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4 Spoo l Insulato r, Class 53.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5 Spoo l Insulator, Class 53-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Appendix Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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American National Standard
for Wet Process Porcelain Insulators -Spool Type
1. Scope
This standard covers spool-typ e insulators made of we t-
process porcelain and used in th e transmission and dis-
tribution of electric energy.
2. Referenced A merican National Standards
This standard is intended to be used in conjunctionwit h the following American National Standards. When
the referenced standards ar e superseded by a revision
approved by the American National Standards Institute,
Inc, the revision shall apply,
ANSI C29.1-1982, Test Methods for Electrical Power
Insulators
ANSI 255.1-1 967 (R 1973), G ray Finishes for Indus-
trial Apparatus and Equipment
3. Definitions
5.2 The entire surface of the insulator, w ith the ex-
ception of a firing surface, shall be glazed. Th e entire
surface shall be relatively free from imperfections.
Color is no t a part of this stan dard. If gray is require d,
it shall be in accordance with ANSI 255.1-1967
(R1973), and conform to Munsellnotation 5BG 7.0/0.4
with the following tolerances:
(1) Hue: f 12 (3G to 7B)
(2) Value: f 0.5
(3) Chroma: -0.2 t o t0 .6
6. Dim ensions and Characteristics
6.1 Figures 1 through 5 (see pages 7-1 1) are drawings
of insulator ty pes. Dim ensions and characteristics of
th e insulators shall be i n accordance with these figures.
6.2 When specified, neck designations and dimensions
shall be as sh own in Table 1.
See Section 2 of ANSI C29.1-1982 for definitions of
terms.7. Marking
4. General
4.1 Insulato rs shall conform in al i respects to the re-
quirements of th is standard, The text and figures sup-
plement each other and shall be considered part of
this standard
4.2 Manufacturer’s drawings, if fu rnished, shall showthe o utline of the insulators, together with all pertinen t
dimensions, Any variations in th ese dimension s due t o
manufacturing tolerances shall be indicated.
5. Material
5.1 The insulators shall be mad e of good co mmercial-
grade w et-process porcelain.
Each insulator shall bear a sy mbol identifying the
man ufacture r. The marking shall be b oth legible anddurable.
Table 1
Neck Designations and Dimensions
DesignationLetter
Diameter(millimeters)
Groove-Height Relationshipas Applicable (millimeters)
Minimum Maximum
A 45 f 3C 51 f 3F 7 3 f 3J 89 f 3
K 102f 3N 152f 3
-
14 2214 226 166 16- -
5
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AMERICAN NATIONAL STAN DARD C29.3-1986
8. Sampling, Inspection, and T ests
8.1 Gen eral. Tests described in 8.2 shall be required
only on in sulators of new designs. Tests described in
8.3 shall be required’on each lot of insulators.
8.2 Design Tests
insulators shall be selected at random and tested inaccordance with 4.2 of ANSI C29.1-198 2.Failure
of t he average dry flashover value of th e three insula-
tors to equal or exceed 95 %of the rated d ry flash-
over value, as given in the applicable figure, shall con-
stitute failure to m eet the requirements of this stan-
dard.
8.2.2 Low -Frequen cy Wet Flashover Test. Three
insulators shall be selected at random and tested in ac-
cordance with 4.3 of ANSI C29.1-19 82.Failure of the
average wet flashover value of th e three insulators t o
equal or exceed 9% of th e rated w et flashover value,
as given in th e app licable figure, shall cons titute failureto meet the requirements of this standard.
8.3 Quality Conformance Tests’
8.3.1 Dimensional Test. Three in sulators shall be
selected at random from th e lot and their dim ensions
8.2.1 Low-Frequency Dry Flashover Test. Three
Substantial test experience indicates that a total of 1/2%ofthe number of insulators in the lot is sufficient to establishcharacteristics demonstrable by destructive tes ts.
6
-___-I-
checked against the dimensions on the manufacturer’s
drawing. Failure of more than one of these insulators
to conform , within manufacturing tolerances, to th e
dimensions on this drawing shall constitute failure of
the lot t o meet th e requirements of this standard.
8.3.2 Visual Test. If visual inspection is required
on lots of 500 or more insulators, 50 insulators shall
be selected at random from th e lot. If more than 4 but
fewer tha n 10 of th e insulators fail to m eet the require-ments of 5.2, 100 additional in sulators shall be se lected
at random from the same lot. Failure of more than a
total of 10 insulators from b oth the first and second
samples shall constitute failure of the lot to m eet th e
requirements of this standard.
8.3.3 Porosity Test. Spe cimen s shall be selected
from insulators destroyed in other tests and tested
in accordance with 5.4 of ANSI C29.1-19 82.Penetra-
tion of th e dye jnto t he body of the dielectric shall con-
stitute failure of the lot t o meet the requirements of
this standard.
8.3.4 TransverseStrength T est, Five insulators
shall be selected at random and tested in accordance
with 5.1.6 of ANSI C29.1-1982.Failure of the aver-
age strength of th e five insulators t o meet the strength
requirem ents given in th e applicab le figure, or failure
of any one insulator to equal 85 % of that strength re-
quirement, shall constitute failure of the lot t o meet
the requirements of this standard.
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AMERICAN NATIONAL STANDARD C29.3-1986
13
GROOVE MUST SEANOT LESS THAN21 D I A M A N D R E L
P4 5 7 - + (NOTE1112 1.5
18 + 1.5-0
22 5.1.5
NOTES :(1 ) “A ” neck.(2 ) AU dimen sions are in m illimeters
Mechanical Values
Rating
Transverse strength, newton s 890 0
Electrical V aluesLow-frequency dry flashover, kilovolts 20
Vertical 8Horizontal 10
Low-frequency wet flashover, kilovolts
See American NationalStandard C29.1 -1982
Section
,5.1.6
4 .2
4.34 .3
Figure 1
Spool Insulator, Class 53-1
7
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AMERICAN NATIONAL STAN DARD C29.3-1986
-79 p - 4 5 2 3 (NOTE . 5 1ì - r
NOT LESS THAN33 DIA MANDREL
1 /------I A\
192 3 \ir38
GROOVE MUST SEAT 76 i 1.5
NOTES:(1 ) "A" neck.(2) Ali dimensions are in m illimeters
Mechanical Values
Electrical Values
Transverse strength, newtons
Low-frequency d ry flashover, kilovolts
Low-frequency we t flashover, kilovoltsVerticalHorizontal
L A - 4 2 1.5
Rating
13300
25
1215
I
-8 t 1.5-0
See American NationalStandard C29.1-1982
Section
5.1.6
4.2
4.34.3
Figure 2
Spool Insulator, Class 53-2
8
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AMERICAN NATIONA L STANDARD C29.3-1986
GROOVE MUST SEATNOT LESS THA N21 DIA MANDREL
18 + 1.5-0
24 2 1.5
NOTES :
(i) A” neck.
(2 ) Ail dimensions are in millimeters
RatingMechanical Values
Electrical Values
Transverse strength, newtons 178 00
Low-frequencydry flashover, kilovolts 25
Vertical 12
Horizontal 15
Low-frequencywet flashover, kiiovolfs
Figure3
Spool Insulator, Class 53-3
See American National
SectionStm datd C29.1-1982
1.5
5.1.6
4.2
4.34.3
9
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AMERICAN NATIONAL STANDAR D C29.3-1986
GROOVE M US T SEATN O T LESS THAN30 D I A M AN D R EL
NOTES:(i) “F” neck.(2 ) AU dimensions are in millimeters
Rating-Mechanical Values
Electrical Values
Transverse strength, newtons 20000
Low-frequency dry flashover, kilovolts 25
Low-frequency wet flashover, kilovoltsVertical 12Horizontal 15
Figure4
Spool Insulator, Class 53-4
10
See American NationalStandard C29.1-1982
Section
5.1.6
4.2
4.34.3
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AMERICANNATIONAL STANDARD C29.3-1986
I = 102i 31 1 73 2 3 ( NOT E I)
GROOVE MUS T SEATNOT LESS THAN21 DIA M A NDRE L
I ’ II
I
I
I
hL----JI
I lI l
52.5
I
I
II I1
I1 I
181t1.5-0i42 1.5
NOTES:(1 ) ‘IF” eck.(2 ) Ail dimensions are in m illimeters
Rating
Transverse strength, newtons 267 00Mechanical Values
Electrical Values
-
Low-frequency dry flashover, kilovolts 35Low-frequ ency wet flashover, kilovolts
Vertical 18Horizontal 25
See Am erican NationalStandard C29.1-19 8 2
Section
5.1.6
4 .2
4 .34.3
I
‘ 3
Figure 5
Spool Insulator, Class 53-5
11
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(This Appendix is not par t of American N ational Standard C29.3-1986, ut is included for informa-Appendix tion only.)
Packaging
Packaging of insulators should be such as to afford reasonable and proper p rotec tion to the
insulators in shipping and handling.
Each box or container should be marked w ith the number of pieces contained therein; th e cata-
log number, or class num ber, or description of th e co nten ts; and th e manufacturer’s name.
12
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