ansi c29-18

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ANSI C29.18-2003

NOTICE AND DISCLAIMER

The information in this publication was considered technically sound by the consensus of personsengaged in the development and approval of the document at the time it was developed.Consensus does not necessarily mean that there is unanimous agreement among every personparticipating in the development of this document.

NEMA standards and guideline publications, of which the document contained herein is one,are developed through a voluntary consensus standards development process. This processbrings together volunteers and/or seeks out the views of persons who have an interest in thetopic covered by this publication. While NEMA administers the process and establishes rulesto promote fairness in the development of consensus, it does not write the document and it

does not independently test, evaluate, or verify the accuracy or completeness of anyinformation or the soundness of any judgments contained in its standards and guidelinepublications.

NEMA disclaims liability for any personal injury, property, or other damages of any naturewhatsoever, whether special, indirect, consequential, or compensatory, directly or indirectlyresulting from the publication, use of, application, or reliance on this document. NEMAdisclaims and makes no guaranty or warranty, express or implied, as to the accuracy orcompleteness of any information published herein, and disclaims and makes no warranty that

the information in this document will fulfill any of your particular purposes or needs. NEMAdoes not undertake to guarantee the performance of any individual manufacturer or sellersproducts or services by virtue of this standard or guide.

In publishing and making this document available, NEMA is not undertaking to renderprofessional or other services for or on behalf of any person or entity, nor is NEMAundertaking to perform any duty owed by any person or entity to someone else. Anyone usingthis document should rely on his or her own independent judgment or, as appropriate, seekthe advice of a competent professional in determining the exercise of reasonable care in anygiven circumstances. Information and other standards on the topic covered by this publicationmay be available from other sources, which the user may wish to consult for additional viewsor information not covered by this publication.

NEMA has no power, nor does it undertake to police or enforce compliance with the contentsof this document. NEMA does not certify, test, or inspect products, designs, or installations forsafety or health purposes. Any certification or other statement of compliance with any healthor safetyrelated information in this document shall not be attributable to NEMA and is solelythe responsibility of the certifier or maker of the statement.

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ANSI C29.18-2003

AMERICANNATIONALSTANDARD

Approval of an American National Standard requires verification by

ANSI that the requirements for due process, consensus, and othercriteria for approval have been met by the standards developer.

Consensus is established when, in the judgment of the ANSI Board ofStandards Review, substantial agreement has been reached by directlyand materially affected interests. Substantial agreement means muchmore than a simple majority, but not necessarily unanimity. Consensusrequires that all views and objections be considered, and that aconcerted effort be made toward their resolution.

The use of American National Standards is completely voluntary; theirexistence does not in any respect preclude anyone, whether he hasapproved the standards or not, from manufacturing, marketing,purchasing, or using products, processes, or procedures notconforming to the standards.

The American National Standards Institute does not develop standardsand will in no circumstances give an interpretation of any AmericanNational Standard. Moreover, no person shall have the right or

authority to issue an interpretation of an American National Standard inthe name of the American National Standards Institute. Requests forinterpretations should be addressed to the secretariat or sponsorwhose name appears on the title page of this standard.

Caution Notice: This American National Standard may be revised orwithdrawn at any time. The procedures of the American NationalStandards Institute require that action be taken periodically to reaffirm,revise, or withdraw this standard. Purchasers of American National

Standards may receive current information on all standards by calling orwriting the American National Standards Institute.

Published by

National Electrical Manufacturers Association

1300 North 17th Street, Rosslyn, VA 22209

Copyright 2003 by National Electrical Manufacturers Association

All rights reserved including translation into other languages, reserved under the Universal CopyrightConvention, the Berne Convention for the Protection of Literary and Artistic Works, and theInternational and Pan American Copyright Conventions.

No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the priorwritten permission of the publisher.

Printed in the United States of America

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Contents

Page

Foreword ......................................................................................................................... vi

1 Scope ..........................................................................................................................1

2 Definitions ......................................................................................................................1

3 General ..........................................................................................................................13.1 Drawings ...........................................................................................................1

4 Materials.........................................................................................................................14.1 Core ............................................................................................................. 14.2 Weathersheds...................................................................................................14.3 Metal parts ........................................................................................................1

5 Dimensions and characteristics.....................................................................................2

6 Marking ..........................................................................................................................2

7 Prototype tests ...............................................................................................................2

7.1 Water penetration test.......................................................................................37.1.1 Test specimens....................................................................................37.1.2 Test procedure.....................................................................................37.1.3 Test evaluation.....................................................................................4

7.2 Aging or accelerated weathering test ...............................................................47.2.1 Test specimens....................................................................................47.2.2 Test procedure.....................................................................................47.2.3 Test evaluation.....................................................................................4

7.3 Dye penetration test..........................................................................................57.3.1 Test specimens....................................................................................57.3.2 Test samples........................................................................................57.3.3 Evaluation ............................................................................................5

7.4 Water diffusion test ...........................................................................................57.4.1 Test specimens....................................................................................57.4.2 Pre-stressing........................................................................................57.4.3 Test arrangements...............................................................................57.4.4 Evaluation ............................................................................................5

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7.7 Specified tensile load test .................................................................................77.7.1 Test specimens....................................................................................77.7.2 Test procedures ...................................................................................77.7.3 Test evaluation.....................................................................................8

7.8 Thermal mechanical test...................................................................................87.8.1 Test specimens....................................................................................87.8.2 Test procedure.....................................................................................87.8.3 Test evaluation.....................................................................................8

7.9 Flammability test for the shed and housing material ........................................8

7.9.1 Test procedures ...................................................................................87.9.2 Test evaluation.....................................................................................8

8 Electrical design tests ....................................................................................................8

8.1 Low-frequency dry flashover.............................................................................88.2 Low-frequency wet flashover test .....................................................................88.3 Critical impulse flashover tests positive.........................................................98.4 Radio-influence voltage test..............................................................................9

9 Quality conformance tests .............................................................................................9

9.1 Dimensional test ...............................................................................................99.2 Galvanizing test.................................................................................................99.3 Cantilever breaking load test ............................................................................9

9.3.1 Test procedures ...................................................................................99.3.2 Test evaluation...................................................................................10

10 Routine Tests...............................................................................................................10

10.1 Tensile load test ..............................................................................................1010.2 Visual examination test ...................................................................................10

11 References to the Text.................................................................................................10

11.1 References to American National Standards .................................................1011.2 References to other than American National Standards ................................10

Tables

1 Dimensions and characteristics, composite distribution line posts...........................11

2 Prototype testing requirements......................................................................................3

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2 Vertical tie-top F-Neck type.Classes 51-1F, 51-2F, 51-3F, & 51-4F ........................................................................12

3 Vertical clamp-top center tapped base type.Classes 51-11, 51-12, 51-13, 51-14, 51-15, & 51-16.. ...............................................13

4 Horizontal clamp-top center tapped base type.Classes 51-21, 51-22, 51-23, 51-24, 51-25, & 51-26. .................................................13

5 Horizontal clamp-top gain base type.Classes 51-31, 51-32, 51-33, 51-34, 51-35, & 51-36. .................................................13

6 Cap dimensions - vertical clamp..................................................................................14

7 Cap dimensions - horizontal clamp..............................................................................14

8 Cap gauge.................................................................................................................... 15

9 Base recess and thread dimensions............................................................................15

10aGain base details .........................................................................................................16

10bGain base details .........................................................................................................16

11 Electrodes for clause 7.4 .............................................................................................17

12 Tracking and erosion test ; method 1 ..........................................................................17

13 Tracking and erosion test ; method 2 ..........................................................................18

14 Thermal mechanical load test ......................................................................................18

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Foreword(This Foreword is not part of American National Standard C29.18-2003.)

This first edition of this standard was based on a NEMA proposed standards publication for compositedistribution line post type insulators used on overhead distribution lines. It was developed at the requestof the American National Standards Committee on Insulators for Electric Power Lines, ASC C-29.

This standard was processed and approved for submittal to ANSI by ASC C-29. Committee approval ofthe standard does not necessarily imply that all committee members voted for approval. At the time itapproved this standard, the ASC C-29 Committee had the following members:

J. Varner, ChairpersonJ. Collins, Secretary

Organization Represented: Name of Representatives:

Edison Electric Institute andElectric Light and Power Group

A. S. JagtianiJ. VarnerN. J. DeSantisR. ChristmanD. H. ShaffnerD. Ruff

Institute of Electrical and Electronic Engineers R. W. HarmonJ. CartwrightT. GrishamT. PinkhamJ. Kuffel

National Electrical Manufacturers Association A. E. SchwalmA. C. Baker

R. A. BernstorfR. J. HillT. NakachiD. G. PowellR. StanleyG. A. Stewart

Other Members: R. Gemignani

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For Insulators Composite

Distribution Line Post Type

1 Scope

This standard covers composite distribution line post insulators made of a fiberglass-reinforced resinmatrix core, elastomeric material weathersheds, and metal end fittings designed for use on overheadlines for electric power systems, 69 kV and below. Mechanical and electrical performance levels specifiedherein are requirements for new insulators.

2 Definitions

See Section 3 of American National Standard for Composite Insulators Test Methods, ANSI C29.11;

Section 3 of American National Standard for Insulators-Composites- Line Post Type, ANSI C29.17; andSection 2 of American National Standard Test Methods for Electrical Power Insulators, ANSI C29.1, fordefinition of terms.

3 General

Insulators shall conform in all respects to the requirements of this standard. The text and figuressupplement each other and shall be considered part of this standard.

3.1 Drawings

Manufacturers drawings, if furnished, shall show the outline of the insulators, together with all pertinentelectrical characteristics, mechanical characteristics, leakage distance, and dimensions as specifiedherein.

4 Materials

4.1 Core

The core of the insulator shall consist of a fiberglass-reinforced resin matrix. The core shall be sound andfree of defects that might adversely affect the mechanical or electrical properties of the insulators.

4.2 Weathersheds

Th th h d h ll b d f l t i t i l h th l l ili

AMERICAN NATIONAL STANDARD ANSI C29.18-2003

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5 Dimensions and Characteristics

Dimensions and characteristics of the insulators shall be in accordance with the manufacturers drawings,Figures 1 through 5, and Table 1. The shapes of the weathersheds and spacing between them are not apart of this standard.

6 Marking

Each insulator shall bear symbols identifying the manufacturer, a manufacturing date code or year ofmanufacture and the Specified Cantilever Load (SCL) with appropriate units. The marking may alsoinclude the manufacturers historical working load rating, identified as the Reference Cantilever Load(RCL), Maximum Design Cantilever Load (MDCL), Maximum Working Load (MWL) or Working CantileverLoad (WCL) to comply with IEC ratings.

7 Prototype Tests

Prototype tests are required to verify the suitability of the materials and methods of manufacture forinsulators defined by the following characteristics:

(1a) same shed material(1b) same housing material(2a) same shed design (includes diameter, thickness, and shape)(2b) same housing design (includes thickness and covering of metal fittings)(3) same core material(4) same core diameter(5) same manufacturing process(6) same metal fitting material(7a) same metal fitting connection zone(7b) same core-metal-housing interface(8) same metal fitting method of attachment to core

To allow for manufacturing variations, (2) and (4) may vary up to 15% before the design tests must berepeated, except retesting is not required for greater thickness of the shed or housing or increased roddimensions that exceed the 15% variation limitation.

The materials and methods of manufacture for insulators shall be qualified by successful completion ofthe following tests. Design changes shall be tested as listed in Table 2.

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Table 2 Prototype testing requirements

If the insulator design changes the

Then the following design prototype tests shall be repeated

(Heading numbers refer to clauses in this standard)

7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9

(1a) Shed Material X X X X

(1b) Housing Material X X X X X X X

(2a) Shed Design X

(2b) Housing Design X X X X

(3) Core Material X X X X X

(4) Core Diameter X X X X

(5) Manufacturing Process X X X X X X X X

(6) Metal End Fitting Material X X X X(7a) Metal End Fitting Connection

Zone DesignX X X

(7b) Core-housing-metal End FittingInterface Design

X X X X X

(8) Metal End Fitting Method ofAttachment to Core

X X X X

SECTION TITLE

WATER

PENETRATIO

N

AGING

DYE

PENETRATION

WATER

DIFFUSION

POWER

ARC

TRACKING

&

EROSI

ON

TENSILE

THERMAL

MECHANIC

AL

FL

AMMABILITY

7.1 Water penetration test

7.1.1 Test specimens

Select three insulators (sample insulators) for this test and an additional identical insulator (referenceinsulator) for the power frequency voltage test (7.1.3).

7.1.2 Test procedure

Measure the hardness of two sheds of all three sample insulators in accordance with ASTM D 2240 witha Shore A durometer.

Boil each sample insulator in water having a 0.1% by weight of NaCl for 100 hours.

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7.1.3 Test evaluation

Visual Examination Inspect the housing of each sample insulator.

There shall be no cracks and no signs of dissolving or crumbling.

Hardness Test Measure the hardness of two sheds of each insulator in accordance with ASTM D 2240 with a Shore

A durometer at the same temperature 5K that the pre-boiling measurements were taken.

The hardness must not change from the pre-boiled specimen by more than 20%.

Steep-Front Impulse Voltage Test Subject each sample insulator to a steep-front impulse of at least 1000 kV / micro-second in

accordance with 7.2.7 of IEEE Std. 4. Each insulator must be subjected to 10 positive impulses and10 negative impulses.

Each impulse must cause an external flashover.

Power Frequency Voltage Test

Determine the power frequency flashover voltage, in accordance with the procedure described inSection 7.1.2 of ANSI Standard C29.11, using the reference insulator, to establish a typical pre-testflashover value.

The three aged sample insulators shall be tested and evaluated in accordance with 7.1.6.3 of ANSIC29.11.

The average flashover value for each sample insulator shall equal or exceed 90% of the averageflashover value of the reference insulator.

Each sample insulator shall be subjected to a voltage equal to 80% of the average flashover value ofthe reference insulator. This voltage must be maintained for 30 minutes. The temperature rise of the

shank of each sample insulator (measured immediately after the test) shall be no more than 20Cabove ambient.

7.2 Aging or accelerated weathering test

7.2.1 Test specimensSelect three new specimens of shed and housing materials for this test (with markings included, ifapplicable).

7.2.2 Test procedureTest each specimen for 1000 hours by one of the following methods. Any markings must be directlyexposed to UV light.

Xenon Arc Methods: ASTM G 26 or ASTM D 2565

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7.3 Dye penetration test


Ten core samples shall be cut from an insulator. The length of the samples shall be 10 mm 0.5 mm.

They shall be cut nominally 90to the axis of the core with diamond-coated circular saw blade under coolrunning water. The cut surfaces shall be smoothed with a 180-grit abrasive cloth. The cut ends shall beclean and approximately parallel.

7.3.2 Test samples

The samples shall be placed on a layer of steel or glass balls in a glass vessel with the fiber vertical. Theballs shall be of the same diameter and in the range of 1 mm to 2 mm. The dye, composed of 1 gram offuchsin in 100 grams of methanol, is poured into the vessel until its level is 2 mm to 3 mm above the topof the balls.

7.3.3 Evaluation

The time for the dye to rise through the samples by capillarity shall be more than 15 minutes.

7.4 Water diffusion test


Six samples shall be cut from an insulator. The length of the specimens shall be 30 mm 0.5 mm. They

shall be cut nominally 90to the axis of the core with a diamond-coated circular saw blade under coolrunning water. The cut surfaces shall be smoothed with a 180-grit abrasive cloth. The cut ends shall beclean and approximately parallel.

7.4.2 Pre-stressing

The surfaces of the specimens shall be cleaned with isopropyl alcohol and filter paper immediately beforeboiling. The specimens shall be boiled in de-ionized water with 0.1% by weight NaCl in a glass container

for 100 hours 0.5 hours. Only one core material may be boiled at one time.

After boiling, the specimens shall be removed from the salt water and placed into tap water in a glasscontainer at room temperature for at least 15 minutes. The following test shall begin within 3 hours ofremoval of the specimens from the salt water.

7.4.3 Test arrangements

The test arrangement is shown in Figure 11. Immediately before the test, the specimens shall beremoved from the water and their surfaces dried with filter paper. The specimens shall be placedbetween the electrodes and the voltage increased at a rate of approximately 1 kV per second to a valueof 12 kV where it shall remain for 1 minute.

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7.5 Power arc test


Three insulators shall be tested.

7.5.2 Test procedures

Each insulator shall be loaded in tension to 1300 lbs. A test rig gripping the base of the insulator capend-fitting may be used to apply the tension load. The load shall be maintained for the duration of thetest.

An arc shall be initiated across each insulator by means of a copper shorting fuse wire. The arc shall burn15 to 150 cycles. The current magnitude (I x t) shall equal or exceed 150 kA-cycles.


The test is passed if each insulator passes the moisture penetration test defined in Section 7.5.3.1.

7.5.3.1 Moisture penetration test

Sequentially submerge each end of each insulator in a dye composed of 1 gram of fuchsin in 100 gramsof methanol for a minimum of 15 minutes.

Remove the insulators from the solution and wipe dry.

Cut each insulator nominally 90to the axis of the core and about 50 mm from each metal fitting. Cut bothmetal fittings on each insulator longitudinally in half and remove the portion of metal fitting.

The test is passed if there is no evidence of dye on the core rod of each of the samples.

7.6 Tracking and Erosion Test


Select three sample insulators for this test and an additional identical reference insulator. Insulators ofreduced length may be substituted for full length insulators to accommodate test equipment limitationsprovided the reduced length insulators have shed profiles and diameters representative of that for a fulllength insulator.


The test circuit shall be configured such that no more than a maximum voltage drop of 5% occurs whenthe circuit is loaded with a resistive current of 250 mA (r.m.s.) on the high voltage side.

Test the three sample insulators using one of the two methods listed below The manufacturer shall

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Method 1: (see Figure 12)

The saline solution spray shall consist of de-ionized water with 0.22 0.01 g/l of NaCl.

The voltage stress shall be 35V/mm of leakage distance. Each insulator shall be exposed to at least1000 hours of test with spray turned on.

The cycle speed shall be 60 10 rotations/hour. Each insulator shall be sprayed with the salinesolution at the bottom of the rotating cycle (see Figure 12). Spray nozzles and flow rate shall beadjusted so that each insulator is completely wetted during each cycle. The distance between thespray nozzle and the sample during spraying shall not be less than 125 mm.

After every four days of testing, the insulators may be given a 24- hour recovery period. During thisperiod, the spray nozzles shall be turned off, but all other features of the test will continue to operate.

Method 2: (see Figure 13)

The saline solution in the tank shall consist of de-ionized water with 1.40 0.06 g/l of NaCl.

The voltage stress shall be 35 V/mm of leakage distance. Each insulator shall be exposed to at least30,000 cycles. Each cycle shall consist of the insulator going through the four positions shown in

Figure 13. Cycle time shall be 200 seconds 25 seconds with the insulator stationary no less than80% of the cycle time. Each position shall require an approximately equal period of time.

After every four days of testing, the insulators may be given a 24 hour recovery period. During thisperiod, the test procedure remains unchanged except that the saline solution is removed from the diptank.


Each aged sample insulator is acceptable if there is no tracking or erosion to the core and no shed orhousing puncture.

Immediately after the tracking wheel test, each aged sample insulator and the reference insulator shall betested and evaluated to the following test, which must be completed within 48 hours of removal from thewheel. The sample insulators shall be rinsed in de-ionized water prior to the following tests. The testsshall be performed in the order listed:

Steep-front impulse voltage test detailed in Section 7.1 (sample insulators only). Power frequency voltage test detailed in Section 7.1 (sample insulators and reference insulator).

Acceptance criteria are specified in Section 7.1.3.

7.7 Specified tensile load test

7.7.1 Test specimensOne insulator shall be tested The test results obtained are valid for all insulators utilizing the same

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7.7.3 Test evaluationThe test is passed if no failure occurs, or the failing load is at or above the STL.

7.8 Thermal-mechanical test


Three insulators as described in Section 7.7.1 shall be tested.

7.8.2 Test procedure

Each insulator shall be tensioned to 220 lbs. for one minute at ambient temperature. During this time thelength of the insulator, including end fittings but excluding couplings, shall be measured to an accuracy ofat least 0.5 mm. This is the reference length.

Each insulator shall be subjected to thermal variations from -50C 5K to +50C 5K while under apermanent tensile load of 50% of the STL for 48 hours. The time at each temperature shall be at least 8hours. The thermal cycle profile is shown in Figure 14.

Following the thermal cycling, each insulator shall be permitted to reach the original ambient temperature

5K and a tension load of 220 lbs. shall be applied. The reference length shall be re-measured.


The test is passed if the increase in length is equal to or less than 2 mm and each insulator passes themoisture penetration test in Section 7.5.3.1.

7.9 Flammability test for the shed and housing material


This test shall be performed according to IEC Publication 60707, Method FV. The test is intended tocheck the weathershed housing material for ignition and self-extinguishing properties.


The test is passed if the test specimen belongs to Category FV0 of IEC Publication 60707.

8 Electrical design tests

Insulator test specimens will be mounted for these tests in accordance with 8.1.2 of ANSI C29.11.Insulators must meet the requirements given in Table 1. Tests on an insulator of a particular dry arcingdistance are valid for all classes with the same dry arcing and similar shed profile and spacing.

8.1 Low-frequency dry flashover

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Three insulators shall be selected and tested in accordance with 8.2.2 of ANSI C29.11. Failure of theaverage wet flashover value of the three units to equal or exceed 90% of the rated wet flashover value,as given in Table 1, shall constitute failure to meet the requirements of this standard.

8.3 Critical impulse flashover tests positive

Three insulators shall be selected for the critical impulse flashover tests, positive, and tested inaccordance with 8.2.6 of ANSI C29.1. Failure of the average critical impulse flashover value of the threeunits to equal or exceed 92% of the rated critical impulse flashover value, as given in Table 1, shallconstitute failure to meet the requirements of this standard.

8.4 Radio-influence voltage test

Three insulators shall be selected and tested in accordance with 8.2.8 of ANSI C29.11. The test voltageand maximum RIV level shall be as listed in Table 1.

9 Quality conformance tests

Samples for quality conformance tests shall be selected at random from the lot.

9.1 Dimensional test

Three insulators shall be selected at random from the lot and their dimensions checked against thedimensions on the manufacturers drawing. Failure of one or more of these insulators to conform withinmanufacturing tolerance to the dimensions on this drawing shall constitute failure to meet therequirements of this standard.

9.2 Galvanizing test

Three pieces representative of each type of galvanized hardware used with the insulators shall be

selected at random and tested in accordance with Section 9.6 of ANSI C29.11. Five to tenmeasurements on un-crimped areas shall be randomly distributed over the rest of the surface. Both theaverage thickness values for each individual specimen and the average of the entire sample shall equalor exceed the following:

Average of entiresample

Average of individualspecimen

Hardware(except nuts/bolts) 3.4 mil 3.1 mil

Nuts / bolts 2.1 mil 1.7 mil

If the sample fails to comply with the table above, six additional pieces of the same type of hardware shallbe selected at random and tested. Failure of the retest sample to comply with the minimum thicknesscriteria shall constitute failure of the lot to meet the requirements of this standard.

9.3 Cantilever breaking load test

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The test is passed if the Cantilever Breaking Load is greater or equal to the Specified Cantilever Load.The failure load and mode shall be recorded. Historical failure loads shall justify the manufacturerschoice of Specified Cantilever Load.

10 Routine tests

Routine tests are to be performed on every insulator produced.

10.1 Tensile load test

Each insulator shall be subjected, at ambient temperature, to a tensile load of at least 50% of the STL forat least 10 seconds. No partial or complete pull out of the core from the end fitting shall occur. A test riggripping the base of the insulator cap end-fitting may be used to apply the tension load.

10.2 Visual examination

The mounting of the metallic parts will be in conformance with the manufacturers drawing. Individualsuperficial defects in the elastomer housing and weathersheds shall not exceed 25 mm

2and the

maximum depth of such defects shall not exceed 1 mm.

11 References to the text11.1 References to American National Standards

When the following American National Standards referred to in this document are superseded by arevision approved by the American National Standards Institute, Inc., the revision shall apply.

ANSI C29.1-1996,American National Standard Test Methods for Electrical Power Insulators.

ANSI C29.11-2003,American National Standard for Composite Insulators Tests Methods

ANSI C29.17-2001,American National Standard for Composite Line Post Insulators

11.2 References to other than American National Standards

ASTM 153-1995, Specifications for Zinc Coating on Iron and Steel Hardware

ASTM D2240-95, Test Method for Rubber Property Durometer Hardness

ASTM G26-95, Practice for Operating Light-Exposure Apparatus (Xenon Arc-Type) with and withoutWater for Exposures of Nonmetallic Materials

ASTM D2565-92a, Practice for Operating Xenon Arc-Type Light Exposure Apparatus with and withoutW t f E f Pl ti

ANSI C29 18 2003

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11

Table 1 Dimensions and characteristics, composite distribution line posts

Low frequency

flashover

Criticalimpulse

flashover

Radio influence

voltage

Section

length

Leakage

distance

Dryarcing

distance

Specifiedcantilever

load

Specifiedtensile

load

Center holenominal

thread size

2

Class DrykV

WetKV

(Positive)KV

Testvoltage

1

KV

Max RIVat 1 MHzmicrovolts Inches

(Min)

Inches

(Nominal)

Inches

(Min)SCL

Pounds

(Min)STL

Pounds Inches Figure

Vertical tie-top C-neckCenter tap base type

51.1C51-2C51-3C51-4C

5570100125

30507095

95120160200

10152230

100100100200

11.8 1.5

14.7 1.5

15.7 2.5

18.1 2.5

10142229

5.26.59.5

12.25

2400240024002240

2000 3/43/43/43/4

1

Vertical tie-top F-neckCenter tap base type

51-1F51-2F51-3F51-4F

5570100125

30507095

95120160200

10152230

100100100200

11.8 1.5

14.7 1.5

15.7 2.5

18.1 2.5

10142229

5.26.59.5

12.25

2400240024002240

2000 3/43/43/43/4

2

Vertical clamp-top

Center tap base type

51-1151-12

51-1351-1451-1551-16

5570

100125160180

3050

7095130150

95120

160200265300

1015

22304444

100100

100200200200

11.8 1.5

14.7 1.5

15.7 2.5

18.1 2.5

22.8 2.5

25.9 2.5

1014

22294251

5.26.5

9.512.2517.2519.25

24002400

2400224024002400

5000 3 43/4

3/43/43/47/8

3

Horizontal Clamp-Top

Center tap base type

51-2151-2251-2351-2451-2551-26

5570100125160180

30507095130150

95120160200265300

101522304444

100100100200200200

11.8 1.5

14.7 1.5

15.7 2.5

18.12.522.8 2.5

25.9 2.5

101422294251

5.26.59.5

12.2517.2519.25

240024002400224024002400

5000 3/43/43/43/43/47/8

4

Horizontal clamp-top

Gain base type

51-3151-3251-3351-3451-35

51-36

5570100125160

180

30507095130

150

95120160200265

300

1015223044

44

100100100200200

200

14.8 2.5

17.7 2.5

18.7 2.5

21.0 2.5

25.8 2.5

28.1 2.5

1014222942

51

5.26.59.5

12.2517.25

19.25

24002400240022402400

2400

5000 ----------

--

5

NOTES1. Low frequency test voltage, r.m.s.-to-ground. 2. Refer to Figure 9 for tapping detail.

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14

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Note: Angle shown is illustrative. Actual angle may be between 5-15.

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