Aluminium-clad steel wires for electrical purposes

Applies to bare, hard-drawn, round, aluminium-clad steel wires of different electrical and mechanical properties.

Aluminium-ummantelte Stahldrähte für die Elektrotechnik

Fils d'acier revêtus d'aluminium pour usages électriques

S'applique aux fils d'acier revêtus d'aluminium pour usages électriques, écrouis, nus, de section circulaire, ayant différentes propriétes mécaniques et électriques. Spécifie les propriétés mécaniques et électriques des fils avec câblage.

Z aluminijem oplaščene jeklene žice za elektrotehnične namene

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EN 61232:1996
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SIST EN 61232:1996
Aluminium-clad steel wires for electrical purposes
Aluminium-ummantelte Stahldrähte für die Elektrotechnik
Fils d'acier revêtus d'aluminium pour usages électriques
Ta slovenski standard je istoveten z: EN 61232:1995
29.060.10 Žice Wires
SIST EN 61232:1996 en

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

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SIST EN 61232:1996
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SIST EN 61232:1996
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SIST EN 61232:1996
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SIST EN 61232:1996
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SIST EN 61232:1996
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SIST EN 61232:1996
Première édition
First edition
Fils d'acier revêtus d'aluminium
pour usages électriques
Aluminium-clad steel wires
for electrical purposes
de reproduction réservés — Copyright — all rights reserved
© CEI 1993 Droits
No part of this publication may be reproduced or utilized in
Aucune partie de cette publication ne peut être reproduite ni
any form or by any means, electronic or mechanical,
utilisée sous quelque forme que ce soit et par aucun pro-
including photocopying and microfilm, without
cédé, électronique ou mécanique, y compris la photocopie et
in writing from the publisher.
les microfilms, sans l'accord écrit de l'éditeur.
Genève, Suisse

Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé

Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
IEC MempiyHapogiaa 3nettrporexHH4ecKaa IioMHCCHa
Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue
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SIST EN 61232:1996
1232 ©IEC:1993 – 3 –
1 Scope 9
2 Normative references 9
3 Definitions 9
4 Requirements 11
5 Sampling 13
6 Test methods 13
7 Packaging 19
8 Acceptance and rejection 19
A Ratio of aluminium and steel cross-sectional areas 25
B Elongation 33
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SIST EN 61232:1996
1232 ©IEC:1993 - 5 -

The IEC (International Electrotechnical Commission) is a worldwide organization for standardization

comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to

promote international cooperation on all questions concerning standardization in the electrical and

electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.

Their preparation is entrusted to technical committees; any IEC National Committee interested in

the subject dealt with may participate in this preparatory work. International, governmental and

non-governmental organizations liaising with the IEC also participate in this preparation. The IEC

collaborates closely with the International Organization for Standardization (ISO) in accordance with

conditions determined by agreement between the two organizations.

The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on

which all the National Committees having a special interest therein are represented, express, as nearly as

possible, an international consensus of opinion on the subjects dealt with.

3) They have the form of recommendations for international use published in the form of standards, technical

reports or guides and they are accepted by the National Committees in that sense.

In order to promote international unification, IEC National Committees undertake to apply IEC International

Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly

indicated in the latter.

This International Standard IEC 1232 has been prepared by IEC technical committee 7:

Bare aluminium conductors.
The text of this standard is based on the following documents:
DIS Report on Voting

Full information on the voting for the approval of this standard can be found in the repo

on voting indicated in the above table.
Annexes A and B are for information only.
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SIST EN 61232:1996
— 7 —

Aluminium-clad steel wires have been used as all aluminium-clad steel stranded wires for

overhead ground wire purposes and as reinforcement of aluminium conductors for over-

head line conductor purposes. In some cases, they are also used as phase conductors.

Since various national standards exist in each country for the aluminium-clad steel wires,

this International Standard establishes the requirements for properties.

It should be noted that this standard has been prepared after consideration of the existing

IEC 888.
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SIST EN 61232:1996
1232 ©IEC:1993 - 9 -
1 Scope

This International Standard applies to bare, hard-drawn, round, aluminium-clad steel wires

of different electrical and mechanical properties, in the diameter ranges shown in table 5,

for electrical purposes, before stranding.

It is intended to cover applications, for reinforcement in aluminium conductors and for all

aluminium-clad steel stranded conductors.
It does not cover the wires for redrawing purposes.
2 Normative references

The following normative document contains provisions which, through reference in this

text, constitute provisions of this International Standard. At the time of publication, the

edition indicated was valid. All normative documents are subject to revision, and parties to

agreements based on this International Standard are encouraged to investigate the possi-

bility of applying the most recent edition of the normative document indicated below.

Members of IEC and ISO maintain registers of currently valid International Standards.

IEC 468: 1974, Method of measurement of resistivity of metallic materials.
3 Definitions
For the purpose of this International Standard, the following definitions apply:

3.1 aluminium-clad steel wire: Round wire consisting of a round steel core with a

uniform and continuous aluminium covering.
3.2 diameter: Mean of two measurements at right angles taken at the same cross-

3.3 class: Aluminium-clad steel wires defined as "205K, "27SA", "30SA" and "40SA",

corresponding to their conductivity grades of 20,3 %, 27 %, 30 % and 40 % IACS*.

3.4 type: Aluminium-clad steel wires of class 20SA are divided into two types, A and B,

according to their tensile strength characteristics.
* IACS: International Annealed Copper Standard.
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SIST EN 61232:1996
1232 © IEC:1993
4 Requirements
4.1 Materials

4.1.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or

basic-oxygen process and shall be of such composition that the finished clad wire shall

have the properties and characteristics given in this standard.
4.1.2 The aluminium used for covering shall have a minimum purity of 99,5 % and

quality sufficient to meet thickness and electrical resistance requirements of this standard.

4.2 Freedom from defects

The wires shall be smooth and free from all impe rfections such as fissures, roughness,

rformance of the product.
grooves, inclusions or other defects which may endanger the pe
4.3 Density

For the purpose of calculating the nominal mass of the wires, the density of the aluminium-

clad steel wire shall be taken as shown in table 1.
4.4 Tolerances on nominal diameter of wires

Aluminium-clad steel wires shall not depart from the nominal diameter by more than the

amounts given in table 2.
4.5 Minimum thickness of aluminium

The minimum aluminium thickness of wires at any point shall comply with the requirements

given in table 3.
4.6 Tensile stress

The wire shall comply with the requirements given in table 5. In computing breaking load

of a single wire from tensile stress, the actual diameter of the finished wire shall be used.

4.7 Elongation

The wire shall comply with either the requirement of 1 % minimum elongation after

fracture, or 1,5 % minimum total elongation at fracture, for, in both cases, a gauge length

of 250 mm. Measurement shall be made either under no load after fracture or at the time

of fracture by the use of a suitable extensometer.

Unless otherwise agreed upon between the manufacturer and purchaser at the time of

purchase, it is at the option of the manufacturer to select the measurement method.

The test shall be made by only one of the two methods prescribed in 6.3.2.
4.8 Resistivity

The maximum resistivity of wires shall conform to the requirements prescribed in table 5 at

the temperature of 20 °C.
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SIST EN 61232:1996
1232 ©IEC:1993 –13 –
4.9 Torsion test

The wire shall withstand, without fracture, not less than 20 twists in a length equivalent to

100 times the nominal diameter of the wire.

The specimen, after twisting to destruction, shall show no separation of the aluminium

from the steel when examined with the naked eye or with normal corrective glasses.

4.10 Stress at 1 % extension

The wire shall conform to the requirement of stress at 1 % extension given in table 5. The

test shall be made on straight undeformed wires.

4.11.1 There shall be no joints of any kind made in the finished wire. Joints may be

made in the wire rods prior to drawing to the finished wire.
The finished wire at such joints shall meet the requirements of 4.5.
such that it can be demonstrated that
4.11.2 Jointing equipment and procedure shall be
be not

the tensile stress of a finished wire specimen containing the jointed section shall

, and also greater than 90 % of minimum specified value in
less than 80 % of normal pa rt
table 5.

4.11.3 Elongation, torsion and stress at 1 % extension tests are not required for jointed

sections in a finished wire.
5 Sampling

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

of finished wire.

In case of wire supply in large quantities and where the manufacturer has demonstrated

capability of meeting or exceeding the requirements, the number of samples may be

reduced, by agreement between the purchaser and the manufacturer, to a level which

ensures that each production lot of wire is given an adequate monitoring.
6 Test methods
6.1 Place of testing

All tests shall be made at the manufacturer's plant unless mutually agreed between the

manufacturer and purchaser.
6.2 Tests

The following tests numbers 1 to 9 shall be made on each of the samples before strand-

ing. When the wires are to be used for products consisting of only aluminium-clad steel

wires, it may be agreed between the manufacturer and the purchaser not to carry out

test 9.
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SIST EN 61232:1996
1232 ©IEC:1993 - 15 -
1) Appearance;
2) finish;
3) diameter;
4) tensile stress;
5) elongation;
6) torsion;
7) resistivity;
minimum aluminium thickness;
9) stress at 1 % extension.
6.3 Test method
6.3.1 Tensile test

The breaking load of the specimen shall be determined by means of a suitable tensile test-

ing machine. The load shall be applied gradually and the rate of

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