American National Standard...ANSI/NEMA C29.7-1996 (R2002, R2012) American National Standard Wet...

ANSI/NEMA C29.7-1996 (R2002, R2012)

American National Standard

Wet Process Porcelain Insulators—

High-Voltage Line-Post Type

ANSI/NEMA C29.7-1996 (R2002, R2012)

American National Standard

Wet Process Porcelain Insulators—

High-Voltage Line-Post Type

Secretariat:

National Electrical Manufacturers Association

Approved: Augus t 2012

Publis hed: May 20, 2013

American National Standards Institute, Inc.

© Copyright 2013 by National Electrical Manufacturers As s ociation

C29.7-1996 (R2002, R2012)

Page ii

NOTICE AND DISCLAIMER

The inform ation in this publication was cons idered technically s ound by the cons ens us of pers ons

engaged in the developm ent and approval of the docum ent at the tim e it was developed. C ons ens us does

not neces s arily m ean that there is unanim ous agreem ent am ong every pers on participating in the

developm ent of this docum ent.

Am erican National Standards Ins titute (ANSI) s tandards and guideline publications , of which the docum ent

contained herein is one, are developed through a voluntary cons ens us s tandards developm ent proces s .

This proces s brings together volunteers and/or s eeks out the views of pers ons who have an interes t in the

topic covered by this publication. While NEMA adm inis ters the proces s and es tablis hes rules to prom ote

fairnes s in the developm ent of cons ens us , it does not write the docum ent and it does not independently

tes t, evaluate, or verify the accuracy or com pletenes s of any inform ation or the s oundnes s of any judgm ents

contained in its s tandards and guideline publications .

NEMA dis claim s liability for any pers onal injury, property, or other dam ages of any nature whats oever,

whether s pecial, indirect, cons equential, or com pens atory, directly or indirectly res ulting from the

publication, us e of, application, or reliance on this docum ent. NEMA dis claim s and m akes no guaranty or

warranty, expres s or im plied, as to the accuracy or com pletenes s of any inform ation publis hed herein, and

dis claim s and m akes no warranty that the info rm ation in this docum ent will fulfill any of your particular

purpos es or needs . NEMA does not undertake to guarantee the perform ance of any individual

m anufacturer or s eller’s products or s ervices by virtue of this s tandard or guide.

In publis hing and m aking this docum ent available, NEMA is not undertaking to render profes s ional or other

s ervices for or on behalf of any pers on or entity, nor is NEMA undertaking to perform any duty owed by any

pers on or entity to s om eone els e. Anyone us ing this docum ent s h ould rely on his or her own independent

judgm ent or, as appropriate, s eek the advice of a com petent profes s ional in determ ining the exercis e of

reas onable care in any given circum s tances . Inform ation and other s tandards on the topic covered by this

publication m ay be available from other s ources , which the us er m ay wis h to cons ult for additional views or

inform ation not covered by this publication.

NEMA has no power, nor does it undertake to police or enforce com pliance with the contents of this docum

ent. NEMA does not certify, tes t, or ins pect products , des igns , or ins tallations for s afety or health purpos es .

Any certification or other s tatem ent of com pliance with any health or s afety–related inform ation in this

docum ent s hall not be attributable to NEMA a nd is s olely the res pons ibility of the certifier or m aker of

the s tatem ent.


C29.7-1996 (R2002, R2012)

Page iii

AMERICAN

NAT IONAL

ST ANDARD

Approval of an Am erican National Standard requires verification by ANSI

that the requirem ents for due proces s , cons ens us , and other criteria for

approval have been m et by the s tandards developer.

Cons ens us is es tablis hed when, in the judgm ent of the ANSI Board of

Standards Review, s ubs tantial agreem ent has been reached by directly

and m aterially affected interes ts . Subs tantial agreem ent m eans m uch

m ore than a s im ple m ajority, but not neces s arily unanim ity. Cons ens us

requires that all views and objections be cons idered, and that a

concerted effort be m ade toward their res olution.

The us e of Am erican National Standards is com pletely voluntary; their

exis tence does not in any res pect preclude anyone, whether he has

approved the s tandards or not, from m anufacturing, m arketing,

purchas ing, or us ing products , proces s es , or procedures not conform ing

to the s tandards .

The Am erican National Standards Ins titute do es not develop s tandards

and will in no circum s tances give an interpretation of any Am erican

National Standard. Moreover, no pers on s hall have the right or authority

to is s ue an interpretation of an Am erican National Standard in the nam e

of the Am erican National Standards Ins titute. Reques ts for

interpretations s hould be addres s ed to the s ecretariat or s pons or whos e

nam e appears on the title page of this s tandard.

Caution Notice: This Am erican National Standard m ay be revis ed or

withdrawn at any tim e. The procedures of the Am erican National

Standards Ins titute require that action be taken periodically to reaffirm ,

revis e, or withdraw this s tandard. Purchas ers of Am erican National

Standards m ay receive current inform ation on all s tandards by calling or

writing the Am erican National Standards Ins titute.

Published by

National Electrical Manufacturers Association

1300 North 17th Street, Rosslyn, VA 22209 Copyright 2013 by National Electrical Manufacturers As s ociation

All rights res erved including trans lati on into other languages , res erved under the Univers al Copyright

Convention, the Berne Convention for the Protection of Literary and Artis tic Works , and the International

and Pan Am erican Copyright Conventions .

No part of thi s publ i cati on may be reproduced i n any form, i n an el ectroni c retri eval system or otherwi se, wi thout the

pri or wri tten permi ssi on of the publ i sher.

Printed in the United States of Am erica .


C29.7-1996 (R2002, R2012)

Page iv

FOREWORD

(This foreword is not part of Am erican National Standard C29.7-1996 (R2002, R2012))

This s tandard is periodically reviewed for any revis ions to keep it current with advancing technology. Sugges tions for im provem ent of this s tandard will be welcom e. They s hould be s ent to National Electrical

Manufacturers As s ociation, 1300 North 17th

Street, Suite 1752, Ros s lyn, VA 22209.

This s tandard was proces s ed and approved for s ubm ittal to ANSI by Accredited Standards Com m ittee on

Ins ulators for Electric Power Lines , C29. Com m ittee approval of the s tandard does not neces s arily im ply

that all com m ittee m em bers voted for approval. At the tim e it approved this s tandard, the ASC C -29

Com m ittee had the following m em bers :

Rob Christman, Chairman

Steve Griffith, Secretary

Organiz ation Represented: Nam e of Representative:

Edis on Electric Ins titute B. Freim ark

R. Chris tm an

E. Cleckley

M. Garrels

W. Avery

J. Varner (alt)

R. Kluge (alt)

G. Obenchain (alt)

Ins titute of Electrical and Electronic Engineers T. Gris ham

J. Hildreth

A. Jagtiani

J. Kuffel

A. Phillips

E. Gnandt (alt)

National Electrical Manufacturers As s ociation P. Maloney

A. Baker

R. A. Berns torf

G. Powell

G. A. Stewart

E. Kres s (alt)

Z. Lodi (alt)

E. Niedos pial (alt)

A. Schwalm (alt)

Tennes s ee Valley Authority J. Nels on

Wes tern Area Power Adm inis tration R. Clark


TABLE OF CONTENTS

C29.7-1996 (R2002, R2012)

Page v

Page

FOREWORD ...............................................................................………………..iv 1 SCOPE ................................................................................................................. 1

2 REFERENCED AMERICAN NATIONAL STANDARDS .................................... 1

3 DEFINITIONS ...................................................................................................... 1

4 GENERAL ............................................................................................................ 1 5 MATERIALS ......................................................................................................... 1

6 DIMENSIONS AND CHARACTERISTICS ......................................................... 2 7 MARKING ............................................................................................................ 5

8 SAMPLING, INSPECTION, AND TESTS .......................................................... 5 8.1 General ......................................................................................................................................................... 5

8.2 Des ign Tes ts ............................................................................................................................................... 5

8.2.1 Low-frequency Dry Flas hover Tes t ........................................................................................................... 5

8.2.2 Low-frequency Wet Flas hover Tes t .......................................................................................................... 5

8.2.3 Critical Im puls e Flas hover Tes t–Pos itive................................................................................................ 5

8.2.4 Radio-influence Voltage Tes t .................................................................................................................... 5

8.2.5 Therm al Shock Tes t .................................................................................................................................... 5

8.3 Quality Conform ance Tes ts ....................................................................................................................... 6

8.3.1 Vis ual and Dim ens ional Tes ts .................................................................................................................. 6

8.3.2 Poros ity Tes t ................................................................................................................................................. 6

8.3.3 Galvanizing Tes t........................................................................................................................................... 6

8.3.4 Cantilever-Strength Tes t............................................................................................................................. 6

8.4 Routine Tes ts ............................................................................................................................................... 6

8.4.1 Routine Flas hover Tes t............................................................................................................................... 6

8.4.2 Routine Cantilever Tes t .............................................................................................................................. 6

TABLES 1 Dimensions and Characteristics of Line Post Insulators ................................................................. 3

2 Neck Designations and Dimensions ...................................................................................................... 5

FIGURES 1 CLASSES 57-1, 57-2, AND 57-3 ................................................................................................................ 7

2 CLASSES 57-4, 57-5, AND 57-6 ................................................................................................................ 8

3 CLASSES 57-11, 57-12, 57-13, 57-14, 57-15, AND 57-16 ................................................................... 9

4 CLASSES 57-21, 57-22, 57-23, 57-24, 57-25, AND 57-26 .................................................................10

5 CLASSES 57-31, 57-32, 57-33, 57-34, 57-35, AND 57-36 .................................................................10

6 CAP DIMENSIONS-VERTICAL CLAMP ...................................................................................................11

7 CAP DIMENSIONS-HORIZONTAL CLAMP .............................................................................................12

8 CAP GAUGE.................................................................................................................................................13

9 BASE RECESS AND THREAD DIMENSIONS ..........................................................................................14

10 GAIN BASE DETAILS..................................................................................................................................15

APPENDIX .......................................................................................................... 16


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© Copyright 2013 by National Electrical Manufacturers As s o ciation

C29.7-1996 (R2002, R2012)

Page 1

AMERICAN NATIONAL STANDARD ANSI/NEMA C29.7-1996

(R2002, R2012)

Wet Process Porcelain Insulators—High-Voltage Line-Post Type

1 SCOPE This s tandard covers high-voltage line-type ins ulators m ade of wet-proces s porcelain and us ed in the

trans m is s ion and dis tribution of electrical ene rgy.

2 REFERENCED AMERICAN NATIONAL STANDARDS

This s tandard is intended for us e in conjunction with the following Am erican National Standards . When

thes e s tandards are s upers eded by a revis ion approved by the Am erican National Standards Ins titute, Inc.

the revis ion s hall apply.

ANSI C29.1-1988 (R2012) Test Methods for Electrical Power Insulators

ANSI Z55.1-1967 (R1973) Am erican National Standard Gray Finishes for Industrial Apparatus and

Equipm ent

ASTM A153-82 Specification for Zinc Coating (Hot Dip) on Iron and Steel Hardware

3 DEFINITIONS

3.1 See s ection 2 of ANSI C29.1-1988 (R2012) for definitions of term s .

3.2 As us ed in the title and els ewhere in this s tandard, the term insulator or insulators s hall m ean any

of the as s em blies s hown whether they cons is t of a s ingle piece of porcelain together with its m etal parts or

of two or m ore s uch porcelains bolted together to form a rigid as s em bly.

As us ed in this s tandard, the term unit, units, insulator unit, or insulator units s hall m ean any s ingle-piece

porcelain as s em bly together with its m etal parts .

4 GENERAL

4.1 Ins ulators s hall conform in all res pects to the requirem ents of this s tandard. The text and figures

s upplem ent each other and s hall be cons idered part of this s tandard.

4.2 Manufacturer’s drawings , if furnis hed, s hall s how the outline of the ins ulators , together with all

pertinent dim ens ions . Any variations in thes e dim ens ions due to m anufacturing tolerances s hall be

indicated.

5 MATERIAL

5.1 The ins ulators s hall be m ade of g ood com m ercial-grade wet-proces s porcelain.


C29.7-1996 (R2002, R2012)

Page 2

5.2 The entire s urface of the ins ulator, with the exception of a firing s urface, s hall be glazed. The entire

s urface s hall be relatively free from im perfections . Color is not a part of this s tandard. If gray is required, it

s hall be in accordance with ANSI Z55.1 -1967 (R1973), and conform to Muns ell notation 5BG 7.0/0.4 with

the following tolerances :

1) Hue: ± 12 (3G to 7B)

2) Value: ± 0.5

3) Chrom a: -0.2 to +0.6

5.3 Metal parts s hall be m ade of a good com m ercial grad e of m alleable iron, ductile iron, s teel, or

alum inum . Ferrous parts , other than s tainles s s teel, s hall be galvanized in accordance with ASTM A153.

6 DIMENSIONS AND CHARACTERISTICS

6.1 Figures 1 through 5 (s ee pages 8-11) are drawings of ins ulator types . Dim ens ions and

characteris tics of the ins ulators s hall be in accordance with thes e figures and Table 1.

6.2 When s pecified, neck des ignations s hall be as s hown in table 2.


C29.7-1996 (R2002, R2012)

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Table 1–Dimensions and Characteristics of Line Post Insulators

Low f requency

f lashover Positive critical

impulse f lashover Radio inf luence voltage Leakage

distance Dry arcing

distance Ref erence

height/length Cantilever

strength Nominal diameter

insulating part Center hole nominal

threaded size

Clas s

Dry kV

Wet kV

kV

Tes t voltage1

kV Max RIV

2

m icrovolts

Inches

Inches

Inches

Pounds

Inches

Inches Figure

Vertical tie-top type 57-1 70 50 120 15 100 14 6.5 9 2800 5.5 3/4 1 57-2 100 70 160 22 100 22 9.5 12 2800 6 3/4 1 57-3 125 95 200 30 200 29 12.25 15 2800 6.5 3/4 1 57-4 140 110 230 44 200 40 14.5 17 2800 7 3/4 2 57-5 160 130 265 44 200 45 17.25 20 2800 7.5 3/4 2 57-6 180 150 300 44 200 53 19.25 23.5 2800 8 7/8 2

Vertical clamp-top type 57-11 70 50 120 15 100 14 6.5 10 2800 6 3/4 3 57-12 100 70 160 22 100 22 9.5 13 2800 6.5 3/4 3 57-13 125 95 200 30 200 29 12.25 16 2800 6.5 3/4 3 57-14 140 110 230 44 200 40 14.5 18.5 2800 7 3/4 3 57-15 160 130 265 44 200 45 17.25 21.5 2800 7.5 3/4 3 57-16 180 150 300 44 200 53 19.25 24.5 2800 8 7/8 3

Horizontal cup-base type 57-21 70 50 120 15 100 14 6.5 11 2800 6 3/4 4 57-22 100 70 160 22 100 22 9.5 14 2800 6.5 3/4 4 57-23 125 95 200 30 200 29 12.25 16.5 2800 6.5 3/4 4 57-24 140 110 230 44 200 40 14.5 20 2800 7 3/4 4 57-25 160 130 265 44 200 45 17.25 22.5 2800 7.5 3/4 4 57-26 180 150 300 44 200 53 19.25 25 2800 8 7/8 4

Horizontal gain-base type 57-31 70 50 120 15 100 14 6.5 11 2800 6 - 5 57-32 100 70 160 22 100 22 9.5 14 2800 6.5 - 5 57-33 125 95 200 30 200 29 12.25 16.5 2800 6.5 - 5 57-34 140 110 230 44 200 40 14.5 20 2800 7 - 5 57-35 160 130 265 44 200 45 17.25 22.5 2800 7.5 - 5 57-36 180 150 300 44 200 53 19.25 25 2800 8 - 5

Note 1: Low frequency tes t voltage, rm s to ground

Note 2: Maxim um RIV at 1000kHz, m icrovolts


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Table 2

Neck Designations and Dimensions

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Page 5

Des ignatio

n

Diam eter

Groove-Height

Relations hip

As Applicable (inches ) Letter (inches ) Minim um Maxim um

A 1-3/4 ± 1/8 - - C 2-14 ± 1/8 9/16 7/8 F 2-7/8 ± 1/8 9/16 7/8 J 3-1/2 ± 1/8 1/4 5/8 K 4 ± 1/8 1/4 5/8 N 6 ± 1/8 9/16 7/8

7 MARKING Each ins ulator s hall bear a s ym bol identifying the m anufacturer and giving the year of m anufacture . The

m arking s hall be legible and durable.

8 SAMPLING, INSPECTION, AND TESTS

8.1 General. Tes ts des cribed in 8.2 s hall be required only on Ins ulators of new des igns . Tes ts

des cribed in 8.3 s hall be required on each lot of ins ulators . Tes ts des cribed in 8.4 s hall be m ade on each

ins ulator.

8.2 Des ign Tes ts

8.2.1 Low-frequency dry flas hover tes t. Three ins ulators s hall be s elected at random and tes ted in

accordance with 4.2 of ANSI C29.1-1988 (R2012). Failure of the average dry flas hover value of the three

ins ulators to equal or exceed 95% of the rated dry flas hover value, as given in Table 1, s hall cons titute

failure to m eet the requirem ents of this s tandard.

8.2.2 Low-frequency wet flas hover tes t. Three ins ulators s hall be s elected at random and tes ted in

accordance with 4.3 of ANSI C29.1-1988 (R2012). Failure of the average wet flas hover value of the three

ins ulators to equal or exceed 90% of the rated wet flas hover value, as g iven in table 1, s hall cons titute

failure to m eet the requirem ents of this s tandard.

8.2.3 Critical im puls e flas hover tes ts –pos itive. Three ins ulators s hall be s elected at random for the

critical im puls e flas hover tes t, pos itive, and tes ted in accordance with 4.7 of ANSI C29.1-1988 (R2012).

Failure of the average critical im puls e flas hover value of the three ins ulators to equal or exceed 92% of the

rated critical im puls e flas hover value, as given in table 1, s hall cons titute failure to m eet the requirem e nts of

this s tandard.

8.2.4 Radio-influence voltage tes t. Three ins ulators s hall be s elected at random and tes ted in

accordance with 4.9 of ANSI C29.1-1988 (R2012). If one or m ore ins ulators fail to m eet the requirem ents

given in table 1, three additional ins ulators s hall be s elected at random and tes ted. Failure of one or m ore

of thes e additional ins ulators s hall cons titute failure to m eet the requirem ents of this s tandard.

8.2.5 Therm al s hock tes t. Three ins ulators s hall be s elected at random and te s ted for ten com plete

cycles in accordance with 5.5 of ANSI C29.1 -1988 (R2012). The tem perature of the hot water bath s hall be

approxim ately 150°F (66°C), and the tem perature of the cold water bath s hall be approxim ately 39°F (4°C).


C29.7-1996 (R2002, R2012)

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If one or m ore ins ulators fail, three additional ins ulators s hall be s elected at random and tes ted. Failure of

one or m ore of thes e additional ins ulators s hall cons titute failure to m eet the requirem ents of this s tandard.

8.3 Quality Conform ance Tes ts

8.3.1 Vis ual and dim ens ional tes ts . Conform ity with 5.2 m ay be determ ined by vis ual ins pection. All

ins ulators not conform ing to 5.2 fail to m eet the requirem ents of this s tandard.

Three ins ulators s hall be s elected at random from the lot and their dim ens ions checked agains t the

dim ens ions on the m anufacturer’s drawing. Failure of m ore than one of thes e ins ulators to conform within

m anufacturing tolerances to the dim ens ions on this drawing s hall cons titute failure of the lot to m eet the

requirem ents of this s tandard.

8.3.2 Poros ity tes t. Specim ens s hall be s elected from ins ulators des troyed in other tes ts and tes ted in

accordance with 5.4 of ANSI C29.1-1988 (R2012). Penetration of the dye into the body of the dielectric s hall

cons titute failure of the lot to m eet the requi rem ents of this s tandard.

8.3.3 Galvanizing tes t. Three pieces repres entative of each type of galvanized hardware us ed with the

ins ulators s hall be s elected at random and tes ted in accordance with Section 6 of ANSI C29.1-1982

(R2012). Five to ten m eas urem ents s hall be uniform ly and random ly dis tributed over the entire s urface.

Both the average thicknes s value for each individual s pecim en and the average of the entire s am ple s hall

equal or exceed the following:

Average of Entire Sam ple Average of Individual Specim en Hardware (except nuts /bolts ) 3.4 m il 3.1 m il Nuts /bolts 2.1 m il 1.7 m il

If the average of one s pecim en, or if the average of the entire s am ple, fails to com ply with the above, ten

additional pieces of the s am e type of hardware s hall be s el ected at random and tes ted. Failure of the

retes t s am ple to com ply with the m inim um thicknes s criteria s hall cons titute failure of the lot to m eet the

requirem ents of this s tandard.

8.3.4 Cantilever-s trength tes t. Three ins ulators s hall be s elected at random and tes ted in accordance

with 5.1.3 of ANSI C29.1-1982 (R2012). Failure of the average s trength of the three ins ulators to m eet the

s trength requirem ent given in the applicable figure, or failure of any one ins ulator to equal 85% of that

s trength requirem ent, s hall cons titute failure of the lot to m eet the requirem ents of this s tandard.

8.4 Routine Tes ts

8.4.1 Routine flas hover tes t. Each ins ulator s hall be s ubjected to a routine flas hover tes t in accordance

with claus e 7.1 of ANSI C29.1-1982 (R2012). For this tes t, an electrode s hall be placed on each s ide of,

and adjacent to, the porcelain barrier. All ins ulators that puncture fail to m eet the requirem ents of this

s tandard.

8.4.2 Routine cantilever tes t. Each as s em bled ins ulator s hall be s ub jected to a cantilever proof tes t.

The load applied s hall be not les s than 40% of the rated cantilever s trength. The force s hall be applied at

the Line end, only and s hall be repeated for each of the four quadrants . All ins ulators that fail do not m eet

the requirem ents of this s tandard.


Note 1: “F” neck

Note 2: See figure 9A for bas e threading .

Note 3: All dim ens ions are in inches .

Note 4: Top wire groove s hall s eat a 1-15/16-inch diam eter m andrel.

Note 5: Side-wire groove s hall s eat a 1-15/16-inch diam eter m andrel.

FIGURE 1

VERTICAL TIE-TOP TYPE-F NECK,

CLASSES 57-1, 57-2, AND 57-3

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C29.7-1996 (R2002, R2012)

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Note 1: “N” neck

Note 2: See figure 9A for Clas s es 57-4 and 57-5 bas e threading and figure 9B for Clas s 57 -6 bas e

threading.


Note 4: Top wire groove s hall s eat a 1-7/16-inch diam eter m andrel.

FIGURE 2

VERTICAL TIE-TOP TYPE-N NECK,

CLASSES 57-4, 57-5, AND 57-6


C29.7-1996 (R2002, R2012)

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Note 1: All dim ens ions are in inches

Note 2: See figure 9A for Clas s es 57-11, 57-12, 57-13, 57-14 and 57-15 bas e threading and figure 9B for

Clas s 57-16 bas e threading.

Note 3: See figure 6 for cap dim ens ions .

FIGURE 3

VERTICAL CLAMP-TOP TYPE,

CLASSES 57-11, 57-12, 57-13, 57-14, 57-15, AND 57-16


C29.7-1996 (R2002, R2012)

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Note 2: See figure 9A for Clas s es 57-21, 57-22, 57-23, 57-24 and 57-25 bas e threading and figure 9B for

Clas s 57-26 bas e threading.


FIGURE 4

HORIZONTAL CLAMP TOP-CUP BASE TYPE,

CLASSES 57-21, 57-22, 57-23, 57-24, 57-25, AND 57-26


Note 2: See figure 10A for Clas s es 57 -31, 57-32, 57-33, and 57-34 bas e details and figure 10B for Clas s

57-35 and 57-36 bas e details .


FIGURE 5

HORIZONTAL CLAMP TOP GAIN BASE TYPE,

CLASSES 57-31, 57-32, 57-33, 57-34, 57-35, AND 57-36


C29.7-1996 (R2002, R2012)

Page 11

Dimension Value a (See note 1) b (See note 1) c 15/32 m in. (See note 2) d 11/32 (See note 2) e (See note 1) f 5/8 - 11 + 0.015 UFS g (See note 3) h 1/2 m in.

Note 1: To be checked by gauge. See figure 8

Note 2: Maxim um to be determ ined by gauges . See figure 8 .

Note 3: The purpos e of this s tandard is to as s ure interchangeability of clam ps . Trunnion bolts of one

m anufacturer are not neces s arily interchangeable with thos e of another.

FIGURE 6

CAP DIMENSIONS-VERTICAL CLAMP


C29.7-1996 (R2002, R2012)

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Dimension Value

c 15/32 (See note 2) d 11/32 m in. (See note 2) e (See note 1) f 5/8 - 11 + 0.015 UFS g (See note 3) h 1/2 m in.

Note 1: To be checked by gauge. See figure 8 .

Note 2: Maxim um to be determ ined by gauges . See figure 8.

Note 3: The purpos e of this s tandard is to as s ure interchangeability of clam ps . Trunnion bolts of one

m anufacturer are not neces s arily interchangeable with thos e of another.

FIGURE 7

CAP DIMENSIONS-HORIZONTAL CLAMP


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Note 2: Tolerance of ± 0.002 inch, except as s hown.

FIGURE 8

CAP GAGE


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Note: All dim ens ions are in inches .

FIGURE 9

BASE RECESS AND THREAD DIMENSIONS


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Note: 13/16” s lot width, 15’16” m inim um length

FIGURE 10

GAIN BASE DETAILS


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APPENDIX (This appendix is not part of Am erican National Standard C29.7-1996 (R2002, R2012), but is included for

inform ation only.)

Packaging

Packaging of ins ulators s hould be s uch as to afford reas onable and proper protection to the ins ulators in

s hipping and handling.

Each box or container s hould be m arked with the num ber of pieces contained therein; the catalog num ber,

or clas s num ber; or des cription of the contents ; and the m anufacturer’s nam e.

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