SIST IEC 60888:1999

Zinc-coated steel wires for stranded conductors

Applies to zinc-coated steel wires used in the construction and/or reinforcement of conductors for overhead power transmission        purposes, and is intended to cover all wires used in construction  where the individual wire diameters, including coating, are in the range of 1.25 mm to 5.50 mm.                                       Three grades of steel are included to reflect the needs of         conductor users: regular steel, high strength steel and extra high strength steel.                                                    Two classes of coating represented by minimum zinc mass per unit   area are included: Class 1 and Class 2.                           [
]This English-language version is derived from the original bilingual publication by leaving out all French-language pages. Missing page   numbers correspond to the French-language pages.

Zinc-coated steel wires for stranded conductors

General Information

• Status: Withdrawn
• Publication Date: 31-Oct-1999
• Withdrawal Date: 31-May-2003
• ICS: 29.060.10 - Wires
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: GAV - Bare aluminium conductors
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Jun-2003
• Due Date: 01-Jun-2003
• Completion Date: 01-Jun-2003
• Ref Project: IEC 60888 - Zinc-coated steel wires for stranded conductors

Standards Content (sample)

SLOVENSKI STANDARD
SIST IEC 60888:1999
01-november-1999
Zinc-coated steel wires for stranded conductors
Zinc-coated steel wires for stranded conductors
Ta slovenski standard je istoveten z: IEC 60888
ICS:
29.060.10 Žice Wires
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST IEC 60888:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST IEC 60888:1999
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SIST IEC 60888:1999
INTERNATIONAL IEC
STANDARD 60888
First edition
1987
Zinc-coated steel wires for stranded conductors
 IEC 1987 Copyright - all rights reserved

No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,

including photocopying and microfilm, without permission in writing from the publisher.

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

Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
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SIST IEC 60888:1999
888 © I E C 1987 — 3 ' —
CONTENTS
Page
FOREWORD
PREFACE
Clause
1. Scope 7
Values for zinc-coated steel wires 7
3. Material 7
Freedom from defects 7
5. Diameter and tolerance on diameter 7
6. 7
Length and tolerance on length
7. Jôints 9
8. Sampling 9
9. Place of testing 9
10.
Mechanical tests 9
10.1 Stress at 1% extension
10.2 Tensile test 11
10.3
Ductility test 11
11. Zinc coating test 13
11.1 Determination of mass of zinc coating 13
11.2 Gas volumetric method 13
11.3 Gravimetric method 13
11.4 Test for adherence of zinc coating 13
11.5 Continuity of coating 15
12.
Certificate of compliance 15
APPENDIX A —
Gas volumetric method for determining mass of zinc coating
APPENDIX B —
Gravimetric method for determining mass of zinc coating
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SIST IEC 60888:1999
888 © I E C 1987 — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ZINC-COATED STEEL WIRES FOR STRANDED CONDUCTORS
FOREWORD

The formal decisions or agreements of the I EC on technical matters, prepared by Technical Committees on which all the

ational

National Committees having a special interest therein are represented, express, as nearly as possible, an inte rn

consensus of opinion on the subjects dealt with.

They have the form of recommendations for international use and they are accepted by the National Committees in that

sense.

In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text of

I E C recommendation for their national rules in so far as national conditions will permit. Any divergence between the I E C

the

corresponding national rules should, as far as possible, be clearly indicated in the latter.

recommendation and the
PREFACE

This standard has been prepared by IEC Technical Committee No. 7 : Bare Aluminium

Conductors.

This standard replaces Clauses 4, 6 and 14, and Sub-clauses 7.2, 13.1 and 13.4 and requirements of

Clause 5 and Sub-clauses 9.1, 13.2 and 13.3 of I E C Publication 209 (1966): Aluminium Conductors,

Steel-reinforced.

It also replaces Clauses 4, 6 and 14, and Sub-clauses 7.2, 13.1 and 13.5 and requirements of Clause 5

and Sub-clauses 9.1, 13.2 and 13.4 of I E C Publication 210 (1966): Aluminium Alloy Conductors,

Steel-reinforced.
The text of this standard is based on the following documents :
on Voting
Six Months' Rule Report
7(CO)421 7(CO)424
on Voting indicated in the table above.
Further information can be found in the Repo rt
The following publication is quoted in this standard :

ISO Standard 1460 (1973) : Metallic Coatings — Hot Dip Galvanized Coatings on Ferrous Materials — Determination of

the Mass per Unit Area — Gravimetric Method.
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SIST IEC 60888:1999
888 ©IEC 1987 — 7 —
ZINC-COATED STEEL WIRES FOR STRANDED CONDUCTORS
1. Scope

This standard applies to zinc-coated steel wires used in the construction and/or reinforcement of

conductors for overhead power transmission purposes.

It is intended to cover all wires used in constructions where the individual wire diameters,

including coating, are in the range of 1.25 mm to 5.50 mm.

Three grades of steel are included to reflect the needs of conductor users: regular steel, high

strength steel and extra high strength steel.

Two classes of coating represented by minimum zinc mass per unit area are included: Class 1

and Class 2.
2. Values for zinc-coated steel wires

For calculation purposes the following values for zinc-coated steel wires shall be used:

7.78 kg/dm3
Density at 20 °C of both Class 1 and Class 2
Coefficient of linear expansion 11.5 x 10-6 per °C
3. Material

The steel wires shall have the properties specified hereinafter. The slab zinc shall be of 99.85%

minimum zinc content. The coating on the wires may be applied by the hot dip or the electrolytic

process.
4. Freedom from defects

The uncoated wires shall be smooth and free from all imperfections not consistent with good

commercial practice. The zinc-coated wires shall be reasonably smooth and free from all imper-

fections not consistent with good commercial practice.
5. Diameter and tolerance on diameter

The diameter of the zinc-coated steel wire shall be taken as the mean of two measurements

taken at 90° at the same cross-section.

The zinc-coated steel wires shall not depart from the nominal diameter, when measured over the

coating, by more than the amounts given in Tables III, IV and V.

It is recognized that the surface of zinc-coatings, particularly those produced by hot dip gal-

vanizing, are not perfectly smooth and free from irregularities. It is therefore intended that these

tolerances be used in gauging the diameters within the uniform areas of zinc-coated wire.

6. Length and tolerance on length

Unless otherwise agreed between the purchaser and manufacturer, steel wires shall be supplied

with a minimum length specified by the purchaser with a permitted va riation of ô%. Random

lengths shorter or longer than this requirement are only acceptable if prior agreement between the

purchaser and manufacturer is made.
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SIST IEC 60888:1999
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888 © I E C 1987
7. Joints

Joints are allowed in the base hot rolled rod or semi-finished wire, before or after heat treatment

and prior to cold drawing, by the electric butt or flash welding processes. Finished but uncoated

wires from rod which has been welded shall have a minimum ultimate tensile stress not less than

80% of that obtained by tests on the adjacent unwelded wire and in no case shall the welded wire be

required to have a strength greater than 90% of the ultimate tensile strength (UTS) values shown in

Tables III, IV and V. Other required values from such wires are not changed except that the

finished wire from that portion of the rod which was welded shall not be required to pass ductility

wrapping and/or torsion tests. The coils containing joints shall be clearly identified.

No joints of any kind shall be made in the finished coated steel wires.
8. Sampling

Samples for tests shall be taken by the manufacturer from 10% of the individual lengths of steel

wire. In cases of wire supply in large quantities and where the manufacturer has a demonstrated

capability of meeting or exceeding properties, the number of test samples may be reduced, with

the agreement of the purchaser and the manufacturer, to a level which ensures that each produc-

tion lot of wire is given adequate monitoring.
9. Place of testing

Unless otherwise agreed between the purchaser and the manufacturer at the time of ordering,

all tests shall be made at the manufacturer's works.
10. Mechanical tests
All tests shall be made on the finished coated wires.
10.1
Stress at 1% extension

One specimen from each of the tests samples shall be gripped in the jaws of the tensile testing

machine. A load corresponding to the appropriate tensile stress given in Column 2 of Table I shall

be applied and an extensometer applied on a 250 mm gauge length and ajusted to the initial setting

given in Column 3 of Table I. (A gauge length of 100 mm or 200 mm may be used if agreed between

the purchaser and manufacturer. The initial settings of the extensometer will be adjusted in the

ion of the actual test length divided by the 250 mm length shown in Table I.) The gauge

proport

length shall be marked on the wire prior to application of load when it is required for subsequent

measurements.
TABLE I
Initial stress and extensometer setting for determination
of stress 1% extension
Actual diameter
Initial setting
(mm) of extensometer
Initial stress
(MPa) (gauge length
250 mm)*
including
Over Up to and
100 0.125
1.24 2.25
200 0.250
2.25 3.00
0.375
3.00 4.75 300
0.500
4.75 5.5 400
initial setting factor of gauge length/250 mm.
* For other gauge lengths, use an
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SIST IEC 60888:1999
888 © I E C 1987 — 11 —

The load shall then be increased uniformly until the extensometer indicates an extension of 1%

of the original gauge length. At this point, the load shall be read from which the value of the stress at

1% extension shall be calculated by dividing this load by the area of the wire based on actual wire

diameter. The value obtained for the specimen shall be not less than the value given in the

appropriate column of Tables III, IV and V.
The specimen may subsequently be used for the tensile and elongation tests.
10.2 Tensile test

The breaking load of one specimen cut from each of the test samples shall be determined by

means of a suitable testing machine.

The load shall be applied uniformly above and below 1% extension and the rate of increasing

separation of the jaws of the testing machine shall be not less than 0.1 times the gauge length in

millimetres per minute and not greater than 0.4 times the gauge length in millimetres per

minute.

The ultimate tensile stress calculated by dividing the breaking load by the area of the wire based

on actual wire diameter shall not be less than the value given in the appropriate column of Tables

III, IV and V.

The specimen may subsequently be used for the ultimate elongation if a test gauge length was

marked on the wire as described in the test for stress at 1% extension.
10.3 Ductility test

The choice between an ultimate elongation test and a torsion test is to be at the discretion of the

manufacturer, unless previously agreed between the manufacturer and purchaser at the time of

placing the order, and the choice of one test or the other in no way prejudices the quality of steel

used.
Elongation test

The ultimate elongation measured under no load after the specimen has been marked as

described in the stress at 1% extension test and loaded as described in the tensile test shall be

determined on one specimen from each of the test samples. After the wire is broken the

specimen ends shall be carefully placed together at the distance between the gauge marks

measured. The elongation is the increase in gauge length expressed as a percentage of the

original gauge length.
For this test to be valid the specimen must break between the gauge marks.

The ultimate elongation shall be not less than the value given in the appropriate column of

Tables III, IV and V.

For routine quality control purposes a factored gauge length may be used (see footnotes to

Tables III, IV and V). However, in cases of dispute, the 250 mm gauge length shall be

mandatory.
Torsion test (not applicable to Class 2 zinc coating)

As an alternative to the ultimate elongation test, one specimen cut from each sample may be

given a torsion test. The specimen shall be gripped in two vice-clamps one of which shall be free

to move longitudinally during the test. A small tensile load, not exceeding 2% of the wire

breaking strength, shall be applied to the sample during testing. The specimen shall be twisted

on its longitudinal axis by causing one of the vices to revolve until fracture occurs and the

number of twists shall be indicated by a counter or other suitable device. The rate of twisting

shall not exceed 60 turns per minute. The number of twists on a length 100 times the wire

diameter shall be not less than the value given in the appropriate column of Tables III, IV

and V.
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SIST IEC 60888:1999
888 © I E C 1987 — 13 —
c) Wrapping test

One specimen cut from each sample of coated steel wire shall be wrapped around a mandrel at a

rate not exceeding 15 turns per minute, of diameter given in the appropriate column of Tables

III, IV and V to form a close helix of eight turns. The wire shall not break.
11. Zinc coating test
11.1 Determination of mass of zinc coating

The mass of coating may be obtained by either a volumetric or gravimetric method. The former

has an acceptable degree of accuracy and has the advantage of rapidity. It is therefore the preferred

method for routine testing of all the sizes of wire which can be conveniently accommodated in the

measuring apparatus. In case of dispute, the gravimetric method shall be accepted as the arbi-

tration meth
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