EN 62420:2008

Concentric lay stranded overhead electrical conductors containing one or more gap(s)

IEC 62420:2008(E) specifies the electrical and mechanical characteristics of concentric lay stranded overhead electrical conductors, containing one or more self-supporting alumimium or aluminium alloy layer(s) made of combination of any of the following metal wires: - Hand drawn aluminium as per IEC 60889, designated A1; - aluminium alloy type A or B as per IEC 60104, designated A2 or A3; - thermal resistant aluminium alloy as per IEC 62004, designated AT1, AT2, AT3, or AT4; - regular strength steel as per IEC 60888, designated S1A or S1B; - high strength steel as per IEC 60888, designated S2A or S2B; - extra-high strength steel as per IEC 60888, designated S3A; - aluminium-clad steel as per IEC 61232, designated 20SA, 27SA, 30SA or 40SA.

Leiter für Freileitungen aus konzentrisch verseilten runden Drähten mit einem oder mehreren Zwischenraum/räumen

Conducteurs pour lignes électriques aériennes câblés en couches concentriques comprenant un ou plusieurs intervalle(s)

La CEI 62420:2008 spécifie les caractéristiques électriques et mécaniques des conducteurs pour lignes électriques aériennes, câblés en couches concentriques comprenant une ou plusieurs couches d'aluminium ou d'alliage d'aluminium autoporteuses, constituées de combinaisons de l'un des câbles métalliques suivants: - aluminium écroui dur selon la CEI 60889, désigné A1; - alliage d'aluminium de type A ou B selon la CEI 60104, désigné A2 ou A3; - type d'alliage d'aluminium résistant à la chaleur selon la CEI 62004, désigné AT1, AT2, AT3 ou AT4; - acier à résistance normale selon la CEI 60888, désigné S1A ou S1B; - acier à haute résistance selon la CEI 60888, désigné S2A ou S2B; - acier à très haute résistance selon la CEI 60888, désigné S3A; - acier revêtu d'aluminium selon la CEI 61232, désigné 20SA, 27SA, 30SA ou 40SA.

Pleteni koncentrično ležeči nadzemni električni vodi z eno ali več režami (IEC 62420:2008)

General Information

• Status: Published
• Publication Date: 13-Aug-2008
• Withdrawal Date: 31-May-2011
• ICS: 29.060.10 - Wires
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/TC 7X - Overhead electrical conductors
• Drafting Committee: IEC/TC 7 - IEC_TC_7
• Parallel Committee: IEC/TC 7 - IEC_TC_7
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 14-Aug-2008
• Completion Date: 14-Aug-2008
• Ref Project: SIST EN 62420:2009 - Concentric lay stranded overhead electrical conductors containing one or more gap(s)

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2009
3OHWHQLNRQFHQWULþQROHåHþLQDG]HPQLHOHNWULþQLYRGL]HQRDOLYHþUHåDPL,(&

Concentric lay stranded overhead electrical conductors containing one or more gap(s)
Leiter für Freileitungen aus konzentrisch verseilten runden Drähten mit einem oder
mehreren Zwischenraum/räumen
Conducteurs pour lignes électriques aériennes câblés en couches concentriques
comprenant un ou plusieurs intervalle(s)
Ta slovenski standard je istoveten z: EN 62420:2008
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62420
NORME EUROPÉENNE
August 2008
EUROPÄISCHE NORM
ICS 29.240.20; 29.060.10
English version
Concentric lay stranded overhead electrical conductors
containing one or more gap(s)
(IEC 62420:2008)
Conducteurs pour lignes électriques Leiter für Freileitungen aus
aériennes câblés en couches konzentrisch verseilten runden Drähten
concentriques comprenant mit einem oder mehreren
un ou plusieurs intervalle(s) Zwischenraum/räumen
(CEI 62420:2008) (IEC 62420:2008)

This European Standard was approved by CENELEC on 2008-06-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62420:2008 E
Foreword
The text of document 7/587/FDIS, future edition 1 of IEC 62420, prepared by IEC TC 7, Overhead
electrical conductors, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 62420 on 2008-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-06-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62420:2008 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62420:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60104 1987 Aluminium-magnesium-silicon alloy wire for – –
overhead line conductors
IEC 60888 1987 Zinc-coated steel wires for stranded – –
conductors
IEC 60889 1987 Hard-drawn aluminium wire for overhead EN 60889 1997
line conductors
IEC 61232 (mod) 1993 Aluminium-clad steel wires for electrical EN 61232 1995
purposes + corr. February 1996
+ A11 2000
IEC 61395 1998 Overhead electrical conductors - Creep EN 61395 1998
test procedures for stranded conductors

IEC 62004 2007 Thermal resistant aluminium alloy wire for –
–
overhead line conductor
IEC 62420
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
Concentric lay stranded overhead electrical conductors containing one or more
gap(s)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 29.240.20, 29.060.10 ISBN 2-8318-9721-1

– 2 – 62420 © IEC:2008(E)
CONTENTS
FOREWORD.4

1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Designation system .8
5 Requirements for stranded conductors .8
5.1 Material .8
5.2 Conductor sizes .8
5.3 Surface .8
5.4 Stranding .8
5.4.1 General .8
5.4.2 Lay ratio for core wires .8
5.4.3 Lay ratio for aluminium layer(s) .9
5.4.4 Joints .9
5.4.5 Linear mass.9
5.4.6 Conductor strength .10
6 Tests .10
6.1 Classification of tests .10
6.2 Type Tests .10
6.2.1 Length of sample required .10
6.2.2 Joints in aluminium wires.10
6.2.3 Annular gap(s).10
6.2.4 Stress-strain curves.11
6.2.5 Breaking strength of conductor .11
6.2.6 Creep curves .11
6.3 Sample tests .11
6.3.1 Cross-sectional area.12
6.3.2 Overall diameter .12
6.3.3 Linear mass.12
6.3.4 Surface condition.12
6.3.5 Lay ratio and direction of lay.12
6.3.6 Breaking strength of wires after stranding (if requested) .13
6.3.7 Wire canting on the outside layer (if requested) .13
7 Inspection.13
7.1 Test location .13
7.2 Acceptance or rejection.13
8 Packaging and marking .14
8.1 Packaging .14
8.2 Marking and tare .14
8.3 Random lengths .14

Annex A (normative) Information to be supplied by purchaser.18
Annex B (normative) Stress-strain test method .19
Annex C (normative) Nominal mass of grease for stranded conductors .22

62420 © IEC:2008(E) – 3 –
Annex D (informative) Alternate method of measuring the gap(s) within the conductor.25
Annex E (informative) Recommended conductor sizes and tables of conductor
properties .26

Figure 1 – Examples of conductors containing one or more gaps .16
Figure 2 – Method of measuring wire canting.17
Figure C.1 – Illustration for calculation of mass of grease in round wire layer (s） .22
Figure C.2 – Illustration of calculation of mass of grease for core layer(s).23
Figure C.3 – Illustration of calculation of grease for annular gap(s).24

Table 1 – Metal combinations permitted.15
Table 2 – Number of joints permitted in aluminium wires.16
a
Table 3 – Standard increments due to stranding .16
Table E.1 – Properties of some A1G/S1A conductors with gaps.27

– 4 – 62420 © IEC:2008(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONCENTRIC LAY STRANDED OVERHEAD ELECTRICAL
CONDUCTORS CONTAINING ONE OR MORE GAP(S)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publicati
...