SIST EN IEC 63248:2023
(Main)Conductors for overhead lines - Coated or cladded metallic wire for concentric lay stranded conductors (IEC 63248:2022)
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay stranded conductors (IEC 63248:2022)
IEC 63248:2022 specifies the properties of wires in the diameter range of, but not limited to, 1,25 mm to 5,50 mm. This document is applicable to coated or cladded metallic wires before stranding used either as concentric lay overhead stranded conductors, or in the manufacture of cores for concentric lay overhead stranded conductors, for power transmission purposes.
The various wire types and their designations are listed in Table A.1. For calculation purposes the values listed in Annex B are used.
This first edition cancels and replaces the first edition of IEC 61232 published in 1993 and the first edition of IEC 60888 published in 1997. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous editions of IEC 61232 and IEC 60888:
a) wire designations have been modified and grouped;
b) wires with zinc coating class 2 were removed;
c) new wire designations have been added;
d) aluminium-clad FeNi36 wires have been added;
e) advanced zinc-aluminium alloy coated steel wires have been added.
Leiter für Freileitungen - Beschichtete oder ummantelte Metalldrähte für Leiter aus konzentrisch verseilten Drähten (IEC 63248:2022)
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay stranded conductors (IEC 63248:2022)
IEC 63248:2022 spécifie les propriétés des fils dont le diamètre est compris, entre autres, dans la plage de 1,25 mm à 5,50 mm. Le présent document s’applique aux fils métalliques revêtus ou recouverts avant toronnage utilisés soit comme conducteurs aériens toronnés à couches concentriques, soit dans la fabrication d’âmes pour conducteurs aériens toronnés à couches concentriques, à des fins de transport d’énergie électrique.
Les différents types de fils et leurs désignations sont énumérés dans le Tableau A.1 . Pour les calculs, les valeurs énumérées dans l’Annexe B sont utilisées.
Cette première édition annule et remplace la première édition de l’IEC 61232 parue en 1993 et la première édition de l’IEC 60888 parue en 1997. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport aux éditions précédentes de l’IEC 61232 et de l’IEC 60888:
- les désignations des fils ont été modifiées et regroupées;
- les fils revêtus de zinc de classe 2 ont été supprimés;
- de nouvelles désignations des fils ont été ajoutées;
- les fils FeNi36 recouverts d’aluminium ont été ajoutés;
- les fils d’acier revêtus d’un alliage zinc-aluminium avancé ont été ajoutés.
Vodniki za nadzemne vode - Prevlečena ali prekrita kovinska žica za koncentrično pletene vodnike (IEC 63248:2022)
Standard IEC 63248:2022 določa lastnosti žic s premerom od 1,25 mm do 5,50 mm. Ta dokument se uporablja za prevlečene ali obložene kovinske žice pred spajanjem, ki se uporabljajo kot koncentrični nadzemni pleteni vodniki ali pri izdelavi jeder za koncentrične nadzemne pletene vodnike za prenos električne energije.
Različne vrste žic in njihove oznake so navedene v preglednici A.1. Pri izračunih se uporabljajo vrednosti iz dodatka B.
Ta prva izdaja preklicuje in nadomešča prvo izdajo standarda IEC 61232, objavljeno leta 1993, ter prvo izdajo standarda IEC 60888, objavljeno leta 1997. Ta izdaja je tehnično popravljena izdaja.
Ta izdaja vključuje naslednje pomembne tehnične spremembe glede na pretekle izdaje IEC 61232 in IEC 60888:
a) spremenjene in združene so bile oznake žic;
b) žice s cinkovo prevleko razreda 2 so bile odstranjene;
c) dodano so bilo nove oznake žic;
d) dodane so bile žice FeNi36, prevlečene z aluminijem;
e) dodane so bile napredne jeklene žice, prevlečene z zlitino cinka in aluminija.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 63248:2023
01-april-2023
Nadomešča:
SIST EN 61232:1996
SIST EN 61232:1996/A11:2002
Vodniki za nadzemne vode - Prevlečena ali prekrita kovinska žica za koncentrično
pletene vodnike (IEC 63248:2022)
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay
stranded conductors (IEC 63248:2022)
Leiter für Freileitungen - Beschichtete oder ummantelte Metalldrähte für Leiter aus
konzentrisch verseilten Drähten (IEC 63248:2022)
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay
stranded conductors (IEC 63248:2022)
Ta slovenski standard je istoveten z: EN IEC 63248:2022
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN IEC 63248:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 63248:2023
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SIST EN IEC 63248:2023
EUROPEAN STANDARD EN IEC 63248
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2022
ICS 29.060.01; 29.240.20 Supersedes EN 61232:1995/corrigendum Feb. 1996,
EN 50189:2000, EN 61232:1995 + A11:2000
English Version
Conductors for overhead lines - Coated or cladded metallic wire
for concentric lay stranded conductors
(IEC 63248:2022)
Conducteurs pour lignes aériennes - Fil métallique revêtu Leiter für Freileitungen - Beschichtete oder ummantelte
ou recouvert pour conducteurs toronnés à couches Metalldrähte für Leiter aus konzentrisch verseilten Drähten
concentriques (IEC 63248:2022)
(IEC 63248:2022)
This European Standard was approved by CENELEC on 2022-04-08. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63248:2022 E
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SIST EN IEC 63248:2023
EN IEC 63248:2022 (E)
European foreword
The text of document 7/715/FDIS, future edition 1 of IEC 63248, prepared by IEC/TC 7 "Overhead
electrical conductors" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 63248:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-04-11
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-04-11
document have to be withdrawn
This document supersedes EN 61232:1995 and EN 50189:2000, and all of their amendments and
corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63248:2022 was approved by CENELEC as a European
Standard without any modification.
2
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SIST EN IEC 63248:2023
IEC 63248
®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Conductors for overhead lines – Coated or cladded metallic wire for concentric
lay stranded conductors
Conducteurs pour lignes aériennes – Fil métallique revêtu ou recouvert pour
conducteurs toronnés à couches concentriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.01; 29.240.20 ISBN 978-2-8322-1080-7
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 63248:2023
– 2 – IEC 63248:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Material . 9
4.1 Steel . 9
4.2 Aluminium . 9
4.3 Zinc . 9
4.4 Zinc-aluminium alloy . 9
4.5 Advanced zinc-aluminium alloy . 9
5 Freedom from defects . 9
6 Joints . 10
7 Tests . 10
7.1 General . 10
7.2 Place of testing . 10
7.3 Sampling rate . 10
7.4 Test methods . 10
7.4.1 Visual test . 10
7.4.2 Diameter . 10
7.4.3 Stress at 1 % extension, tensile strength and elongation . 11
7.4.4 Ductility tests . 12
7.4.5 Coating or cladding tests . 13
7.4.6 Coefficient of linear expansion . 14
7.4.7 Resistivity . 14
7.4.8 Coating adherence heat resistance test . 15
8 Acceptance and rejection . 15
9 Certificate of compliance . 15
10 Packaging . 15
10.1 Type of packaging. 15
10.2 Length and tolerance on length . 15
Annex A (normative) Tables of properties for recommended IEC wire materials . 16
Annex B (informative) Properties of wire for calculation purposes . 31
Annex C (informative) Method to measure the equivalent diameter by volume . 33
Annex D (informative) Ratio of aluminium and steel or FeNi36 cross-sectional areas . 35
D.1 Standard ratio in cross-section . 35
D.2 Average aluminium thickness . 35
Bibliography . 37
Figure C.1 – Optical ground wire (OPGW) composed of formed aluminium-clad steel
wires . 33
Figure C.2 – Example of density measurement apparatus . 33
Table A.1 – Wire designation . 16
Table A.2 – Schedule of tests . 17
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SIST EN IEC 63248:2023
IEC 63248:2022 © IEC 2022 – 3 –
Table A.3 – Zinc-aluminium alloy ingot composition (group 4 and group 5) . 18
Table A.4 – Requirements for zinc and zinc-aluminium alloy coated steel wires
(group 1, group 4 and group 5) . 19
Table A.5 – Requirements for aluminium-clad FeNi36 wires (group 2) . 23
Table A.6 – Requirements for aluminium-clad steel wires (group 3) . 24
Table A.7 – Initial setting for determining stress at 1 % extension . 27
Table A.8 – Coating requirements for zinc and zinc-aluminium alloy coated wires . 28
Table A.9 – Cladding requirements for group 2 and group 3 wire . 29
Table A.10 – Coating heat resistance test for group 4 and group 5 wire . 29
Table A.11 – Temperatures for linear expansion test for group 2 wire . 29
Table A.12 – Minimum number of dips for zinc and zinc alloy coatings (group 1,
group 4, group 5) . 30
Table B.1 – Properties of wire for calculation purposes . 31
Table D.1 – Standard aluminium and steel or FeNi36 ratio in the cross section for
group 2 and group 3 wires . 35
Table D.2 – Average aluminium thickness . 36
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SIST EN IEC 63248:2023
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUCTORS FOR OVERHEAD LINES – COATED OR CLADDED
METALLIC WIRE FOR CONCENTRIC LAY STRANDED CONDUCTORS
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63248 has been prepared by IEC technical committee 7: Overhead electrical conductors.
It is an International Standard.
This first edition cancels and replaces the first edition of IEC 61232 published in 1993 and the
first edition of IEC 60888 published in 1987. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
editions of IEC 61232 and IEC 60888:
a) wire designations have been modified and grouped;
b) wires with zinc coating class 2 were removed;
c) new wire designations have been added;
d) aluminium-clad FeNi36 wires have been added;
e) advanced zinc-aluminium alloy coated steel wires have been added.
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SIST EN IEC 63248:2023
IEC 63248:2022 © IEC 2022 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
7/715/FDIS 7/720/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
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SIST EN IEC 63248:2023
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INTRODUCTION
The purpose of this document is to group together similar wire materials that share the same
general characteristics and therefore the same test procedures and requirements. Included in
this document are existing wire types from IEC 60888 and IEC 61232 as well as new wire
materials that are already in use around the world in new types of conductors.
Zinc coating class 2 according to IEC 60888 has not been included in this document, as the
demand for this class of zinc coating is extremely rare. Extra corrosion protection can be
provided by other means, including the use of zinc-aluminium alloy coatings.
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SIST EN IEC 63248:2023
IEC 63248:2022 © IEC 2022 – 7 –
CONDUCTORS FOR OVERHEAD LINES – COATED OR CLADDED
METALLIC WIRE FOR CONCENTRIC LAY STRANDED CONDUCTORS
1 Scope
This document specifies the properties of wires in the diameter range of, but not limited to,
1,25 mm to 5,50 mm. This document is applicable to coated or cladded metallic wires before
stranding used either as concentric lay overhead stranded conductors, or in the manufacture of
cores for concentric lay overhead stranded conductors, for power transmission purposes.
The various wire types and their designations are listed in Table A.1. For calculation purposes
the values listed in Annex B are used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IEC 60050 (all parts), International Electro-technical Vocabulary (IEV) (available at
www.electropedia.org)
IEC 60468, Method of measurement of resistivity of metallic materials
ISO 752, Zinc ingots
ISO 6892-1, Metallic materials – Tensile testing – Part 1: Method of test at room temperature
ISO 7500-1, Metallic materials – Calibration and verification of static uniaxial testing machines
– Part 1: Tension/compression testing machines – Calibration and verification of the force-
measuring system
ISO 7800, Metallic materials – Wire – Simple torsion test
ISO 7801, Metallic materials – Wire – Reverse bend test
ISO 7802, Metallic materials – Wire – Wrapping test
ISO 7989-2, Steel wire and wire products – Non-ferrous metallic coatings on steel wire – Part 2:
Zinc or zinc-alloy coating
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050 (all parts) and
the following apply.
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SIST EN IEC 63248:2023
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ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
cladded metallic wire
result of a process by which a metal is bonded under high pressure by co-rolling, co-extrusion,
or other, onto a wire creating a metallic bond between them
3.2
class
number attributed to aluminium-clad wires for the purpose of providing an approximate
conductivity value
3.3
coated metallic wire
result of a process by which a metal is deposited onto a wire by hot-dip or electrolytic process,
creating a chemical or metallic bond between them
3.4
equivalent diameter
diameter of a round wire, which would have the same cross sectional area as a given formed
wire
3.5
formed wire
drawn or rolled metal wire having a constant non-circular cross-section
3.6
group
designation given to wire types that share a common coating or cladding, or property, for a
similar purpose
3.7
FeNi36
grade of steel-nickel alloy designed to have a very low coefficient of thermal expansion
3.8
lot
group of production units of one type and size of wire, which was manufactured by the same
manufacturer during the same time period under similar conditions of production
Note 1 to entry: A lot can consist of part or all of a purchased quantity.
3.9
nominal
value of a measurable property to which tolerance is applied
Note 1 to entry: Nominal values are target values.
3.10
production unit
coil, reel, spool, or other package of wire that represents a single usable length
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SIST EN IEC 63248:2023
IEC 63248:2022 © IEC 2022 – 9 –
3.11
sample
specimen or specimens removed from a production unit or units and considered to have
properties representative of a lot
3.12
specimen
length of wire removed for test purposes
3.13
zinc-aluminium alloy
mixture of zinc and aluminium coating applied onto the wire for the purpose of protecting it
against corrosion
Note 1 to entry: Some of these alloys with particular mixture are called mischmetal.
3.14
advanced zinc-aluminium alloy
zinc-aluminium alloy reaching specific requirements as specified in ISO7989-2
Note 1 to entry: Examples of advanced zinc-aluminium alloys are Zn90 % + 10 % aluminium and Zn95 % + 5 %
aluminium with 0,2 % to 0,5 % magnesium.
4 Material
4.1 Steel
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 wire shall have the properties and
characteristics given in this document.
4.2 Aluminium
The aluminium used for coating or cladding shall have a minimum purity of 99,5 % and be of
sufficient quality to meet the thickness and electrical resistance requirements of this document.
4.3 Zinc
The ingot of zinc used for coating shall meet the requirements of ZN-3 in accordance with
ISO 752.
The zinc coating shall be applied by either the hot-dip or electroplating method. Unless agreed
between the purchaser and the manufacturer, the method of coating shall be at the discretion
of the manufacturer.
4.4 Zinc-aluminium alloy
The ingot of zinc-aluminium alloy used for coating shall be in accordance with Table A.3.
4.5 Advanced zinc-aluminium alloy
The ingot of advanced zinc-aluminium alloy used for coating shall be in accordance with
Table A.3.
5 Freedom from defects
The wires shall be smooth and free from all imperfections such as cracks, roughness, grooves,
inclusions and other defects which can compromise the performance of the final product.
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6 Joints
No joints shall be made in the finished coated or cladded wire.
Joints may be made at any stage of processing prior to final cold drawing by the electric butt-
weld or flash-welding process.
Welding equipment and procedure shall be such that it can be demonstrated that the ultimate
tensile strength of a finished wire specimen containing the welded section shall be not less than
96 % of the specified minimum stress at 1 % extension.
A welded section shall not be required to meet the stress at 1 % extension, elongation, torsion,
bend, and wrap tests. All other requirements need to be met.
No joints are allowed after heat treatment on wires, which will be used in single-wire conductors.
7 Tests
7.1 General
Tests shall be made by the manufacturer on the wires to demonstrate their conformity to this
document. Tests shall be made in accordance with Table A.2.
Tests shall be performed between 10 °C and 30 °C.
7.2 Place of testing
Unless otherwise agreed between the purchaser and the manufacturer at time of ordering, all
tests shall be carried out at the manufacturer’s premises.
7.3 Sampling rate
The specimen for tests specified in 7.4 shall be taken by the manufacturer from samples of at
least 10 % of each lot.
Alternatively, if a quality assessment procedure is in place and implemented, the sampling rate
shall be subject to agreement between the manufacturer and purchaser.
7.4 Test methods
7.4.1 Visual test
The surface of the wire shall be visually examined to ensure that it is smooth and free from all
imperfections including, but not limited to, cracks, unevenness, holes and inclusion of impurities.
7.4.2 Diameter
7.4.2.1 Unit for diameter
The nominal diameter of a wire shall be expressed in millimetres to two decimal places.
7.4.2.2 Diameter from direct measurements
The diameter of a round wire shall be the mean of two measurements at right angle taken at
the same cross-section. The measurement apparatus shall have an accuracy of at least
0,001 mm.
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IEC 63248:2022 © IEC 2022 – 11 –
When tested in accordance with 7.4.2.2, the diameter shall not vary from its nominal value by
more than the appropriate value indicated in Table A.4, Table A.5, or Table A.6.
7.4.2.3 Diameter from weight measurements
The equivalent diameter of a formed wire shall be obtained from weight measurements made
on a sample not less than 1,0 m in length, and with its density as defined in Table B.1.
The equivalent diameter, D, of the formed wire shall be calculated by Formula (1).
4A
D= (1)
πρL
where:
D is the equivalent diameter of the sample in mm;
A is the weight of the sample with length L in g;
L is the length of the sample in m;
ρ
3
is the density of the sample in g/cm .
When tested in accordance with 7.4.2.3 the equivalent diameter shall not vary from its nominal
value by more than the tolerance value indicated in Table A.4, Table A.5, or Table A.6.
7.4.2.4 Diameter from volume measurement
Alternatively the equivalent diameter of a formed wire shall be obtained from the volume and
weight measurements as described in Annex C.
When tested in accordance with 7.4.2.4 the equivalent diameter shall not vary from its nominal
value by more than the tolerance value indicated in Table A.4, Table A.5, or Table A.6.
7.4.3 Stress at 1 % extension, tensile strength and elongation
7.4.3.1 Sample preparation
The wire samples shall be free from bends or kinks other than the curvature resulting from the
usual coiling operation. They shall be straightened before being inserted in the grips of the
tensile testing equipment with a roller type wire straightening arrangement or by any other
means designed to exert the minimum effect upon the mechanical properties of the sample.
Samples for tests shall not be less than 450 mm long and shall be fitted in the testing machine
so as to leave a free length of minimum 300 mm between the grips.
7.4.3.2 Stress at 1 % extension and tensile strength
The test shall be performed in accordance with ISO 6892-1.
The force-measuring system of the testing machine shall be calibrated in accordance with
ISO 7500-1, class 1, or better.
The rate of separation of the jaws of the testing machine shall be between 25 mm/min and
100 mm/min.
In order to obtain a straight test piece and ensure the alignment of the test piece and grip
arrangement, a preliminary load corresponding with the initial stress in accordance with
Table A.7 shall be applied.
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This load shall be maintained while a 250 mm gauge is marked on the sample and a suitable
extensometer applied on a 250 mm gauge length (not necessarily corresponding with the
marked gauge length).
A correction o
...
SLOVENSKI STANDARD
oSIST prEN IEC 63248:2021
01-julij-2021
Vodniki za nadzemne vode - Prevlečena ali oblečena kovinska žica za
koncentrične laične vodnike
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay
stranded conductors
Ta slovenski standard je istoveten z: prEN IEC 63248:2021
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
oSIST prEN IEC 63248:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 63248:2021
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oSIST prEN IEC 63248:2021
7/706/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63248 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-04-30 2021-07-23
SUPERSEDES DOCUMENTS:
7/702/CD, 7/703A/CC
IEC TC 7 : OVERHEAD ELECTRICAL CONDUCTORS
SECRETARIAT: SECRETARY:
China Mr Qiu Zheng
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 11
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
TITLE:
Conductors for overhead lines - Coated or cladded metallic wire for concentric lay stranded
conductors
PROPOSED STABILITY DATE: 2024
NOTE FROM TC/SC OFFICERS:
Copyright © 2021 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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oSIST prEN IEC 63248:2021
IEC CDV 63248/Ed1 IEC:2021 – 2 – 7/706/CDV
1 CONTENTS
2
3 FOREWORD . 4
4 INTRODUCTION . 6
5 1 Scope . 7
6 2 Normative references . 7
7 3 Terms and definitions . 7
8 4 Material . 9
9 4.1 Steel . 9
10 4.2 Aluminium . 9
11 4.3 Zinc . 9
12 4.4 Zinc-aluminium alloy . 9
13 4.5 Advanced zinc-aluminium alloy . 9
14 5 Freedom from defects . 9
15 6 Joints . 9
16 7 Tests . 10
17 7.1 General . 10
18 7.2 Place of testing . 10
19 7.3 Sampling rate . 10
20 7.4 Test methods . 10
21 7.4.1 Visual test . 10
22 7.4.2 Diameter . 10
23 7.4.3 Stress at 1% extension, tensile strength and elongation . 11
24 7.4.4 Ductility tests . 12
25 7.4.5 Coating or cladding tests . 13
26 7.4.6 Coefficient of linear expansion . 14
27 7.4.7 Resistivity . 14
28 7.4.8 Coating adherence heat resistance test . 14
29 8 Acceptance and rejection . 15
30 9 Certificate of compliance . 15
31 10 Packaging . 15
32 10.1 Type of packaging . 15
33 10.2 Length and tolerance on length . 15
34 Annex A (normative) Tables of properties for recommended IEC wire materials . 16
35 Annex B (informative) Properties of wire for calculation purposes . 32
36 Annex C (informative) Method to measure the equivalent diameter by volume . 34
37 Annex D (informative) Ratio of aluminium and steel or FeNi36 cross-sectional areas . 36
38 Bibliography . 38
39
40 Figure C.1 – OPGW composed of a formed aluminium-clad steel wires . 34
41 Figure C.2 – Density measurement apparatus for example . 34
42
43 Table A.1 – Wire designation . 16
44 Table A.2 – Schedule of tests . 17
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45 Table A.3 – Zinc-aluminium alloy ingot composition (group 4 and group 5) . 18
46 Table A.4 – Requirements for zinc and zinc-aluminium alloy coated steel wires (group
47 1, group 4 and group 5) . 19
48 Table A.5 – Requirements for aluminium-clad FeNi36 wires (group 2) . 23
49 Table A.6 – Requirements for aluminium-clad steel wires (group 3) . 25
50 Table A.7 – Initial setting for determining stress at 1% extension . 28
51 Table A.8 – Coating requirements for zinc and zinc-aluminium alloy coated wires . 29
52 Table A.9 – Cladding requirements for Group 2 and Group 3 wire . 30
53 Table A.10 – Coating heat resistance test for Group 4 and Group 5 wire . 30
54 Table A.11 – Temperatures for linear expansion test for Group 2 wire . 31
55 Table A.12 – Minimum number of dips for Zn and Zn Alloy coatings (group 1, group 4,
56 group 5) . 31
57 Table B.1 – Properties of wire for calculation purposes . 32
58 Table D.1 – Standard aluminium and steel or FeNi36 ratio in the cross section for
59 Group 2 and Group 3 wires . 36
60 Table D.2 – Average aluminium thickness . 37
61
62
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IEC CDV 63248/Ed1 IEC:2021 – 4 – 7/706/CDV
63 INTERNATIONAL ELECTROTECHNICAL COMMISSION
64 ____________
65
66 CONDUCTORS FOR OVERHEAD LINES - COATED OR CLADDED
67 METALLIC WIRE FOR CONCENTRIC LAY STRANDED CONDUCTORS
68
69
70
71 FOREWORD
72 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
73 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
74 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
75 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
76 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
77 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
78 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
79 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
80 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
81 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
82 consensus of opinion on the relevant subjects since each technical committee has representation from all
83 interested IEC National Committees.
84 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
85 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
86 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
87 misinterpretation by any end user.
88 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
89 transparently to the maximum extent possible in their national and regional publications. Any divergence between
90 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
91 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
92 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
93 services carried out by independent certification bodies.
94 6) All users should ensure that they have the latest edition of this publication.
95 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
96 members of its technical committees and IEC National Committees for any personal injury, property damage or
97 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
98 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
99 Publications.
100 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
101 indispensable for the correct application of this publication.
102 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
103 rights. IEC shall not be held responsible for identifying any or all such patent rights.
104 IEC 63248 has been prepared by IEC technical committee 7: OVERHEAD ELECTRICAL
105 CONDUCTORS. It is an International Standard.
106 This International Standard cancels and replaces IEC 61232:1993 Edition 1.0, and replaces
107 IEC 60888:1987 Edition 1.0 excluding wires with zinc coating class 2.
108 The text of this International Standard is based on the following documents:
Draft Report on voting
7/702/CD 7/703A/CC
109
110 Full information on the voting for its approval can be found in the report on voting indicated in
111 the above table.
112 The language used for the development of this International Standard is English.
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113 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
114 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
115 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
116 described in greater detail at http://www.iec.ch/standardsdev/publications.
117 The committee has decided that the contents of this document will remain unchanged until the
118 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
119 specific document. At this date, the document will be
120 • reconfirmed,
121 • withdrawn,
122 • replaced by a revised edition, or
123 • amended.
124
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125 INTRODUCTION
126 The purpose of this standard is to group together similar wire materials that share the same
127 general characteristics and therefore the same test procedures and requirements. Included in
128 this standard are existing wire types from IEC 60888 and IEC 61232 as well as new wire
129 materials that are already in use around the world in new types of conductors.
130 Zinc coating class 2 according to IEC 60888 has not been included in this standard, as the
131 demand for this class of zinc coating is extremely rare. Extra corrosion protection can be
132 provided by other means, including the use of Zinc-aluminium alloy coatings.
133
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134 CONDUCTORS FOR OVERHEAD LINES - COATED OR CLADDED
135 METALLIC WIRE FOR CONCENTRIC LAY STRANDED CONDUCTORS
136
137
138
139 1 Scope
140 This document specifies the properties of wires in the diameter range of, but not limited to, 1,25
141 mm to 5,50 mm. This standard is applicable to coated or cladded metallic wires before stranding
142 used either as concentric lay overhead stranded conductors, or in the manufacture of cores for
143 concentric lay overhead stranded conductors, for power transmission purposes.
144 The various wire types and their designations are listed in Table A.1. For calculation purposes
145 the values listed in Table B.1 shall be used.
146 2 Normative references
147 The following documents are referred to in the text in such a way that some or all of their content
148 constitutes requirements of this document. For dated references, only the edition cited applies.
149 For undated references, the latest edition of the referenced document (including any
150 amendments) applies.
151 IEC 60050, International electro-technical vocabulary
152 IEC 60468, Method of measurement of resistivity of metallic materials.
153 ISO 752, Zinc ingots
154 ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room
155 temperature
156 ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
157 Tension/compression testing machines — Verification and calibration of the force-
158 measuring system
159 ISO 7800, Metallic materials — Wire — Simple torsion test
160 ISO 7801, Metallic materials — Wire — Reverse bend test
161 ISO 7802, Metallic materials — Wire — Wrapping test
162 ISO 7989-2, Steel wire and wire products — Non-ferrous metallic coatings on steel wire —
163 Part 2: Zinc or zinc-alloy coating
164 3 Terms and definitions
165 For the purposes of this document, the terms and definitions given in IEC 60050 and the
166 following terms and definitions apply.
167 ISO and IEC maintain terminological databases for use in standardization at the following
168 addresses:
169 • IEC Electropedia: available at http://www.electropedia.org/
170 • ISO Online browsing platform: available at http://www.iso.org/obp
171 3.1
172 cladded metallic wire
173 the result of a process by which a metal is bonded under high pressure by co-rolling, co-
174 extrusion, or others, onto a wire creating a metallic bond between them
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175 3.2
176 class
177 a number attributed to aluminium-clad wires for the purpose of providing an approximate
178 conductivity value
179 3.3
180 coated metallic wire
181 the result of a process by which a metal is deposited onto a wire by hot-dip or electrolytic
182 process, creating a chemical or metallic bond between them
183 3.4
184 equivalent diameter
185 the diameter of a round wire, which would have the same cross sectional area as a given formed
186 wire
187 3.5
188 formed wire
189 a drawn or rolled metal wire having a constant non-circular cross-section
190 3.6
191 group
192 a designation given to wire types that share a common coating or cladding, or property for a
193 similar purpose
194 3.7
195 FeNi36
196 a grade of steel-nickel alloy designed to have a very low coefficient of thermal expansion
197 3.8
198 lot
199 a group of production units of one type and size of wire, which was manufactured by the same
200 manufacturer during the same time period under similar conditions of production
201 Note: A lot can consist of part or all of a purchased quantity.
202 3.9
203 nominal
204 the value of a measurable property to which tolerance is applied. Nominal values are target
205 values
206 3.10
207 production unit
208 a coil, reel, spool, or other package of wire that represents a single usable length
209 3.11
210 sample
211 specimen or specimens removed from a production unit or units which is considered to have
212 properties representative of a lot
213 3.12
214 specimen
215 a length of wire removed for test purposes
216 3.13
217 zinc-aluminium alloy
218 a mixture of zinc and aluminium coating applied onto the wire for the purpose of protecting it
219 against corrosion.
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220 Note: Some of these alloys with particular mixture are called Mischmetal.
221 3.14
222 advanced zinc-aluminium alloy
223 a zinc-aluminium alloy reaching specific requirements as specified in ISO7989-2
224 Note: Examples of advanced zinc-aluminium alloys are Zn90% + 10% aluminium and Zn95% + 5 % aluminium with
225 0,2 to 0,5 % magnesium.
226 4 Material
227 4.1 Steel
228 The base metal shall be steel produced by the open hearth, electric furnace, or basic oxygen
229 process and shall be of such composition that the finished wire shall have the properties and
230 characteristics given in this standard.
231 4.2 Aluminium
232 The aluminium used for coating or cladding shall have a minimum purity of 99,5% and of
233 sufficient quality to meet thickness and electrical resistance requirements of this standard.
234 4.3 Zinc
235 The ingot of zinc used for coating shall meet the requirements of ZN-3 according ISO 752.
236 The zinc coating shall be applied by either the hot-dip or electroplating method. Unless agreed
237 between the purchaser and the manufacturer, the method of coating shall be at the discretion
238 of the manufacturer.
239 4.4 Zinc-aluminium alloy
240 The ingot of zinc-aluminium alloy used for coating shall be in accordance with Table A.3.
241 4.5 Advanced zinc-aluminium alloy
242 The ingot of advanced zinc-aluminium alloy used for coating shall be in accordance with Table
243 A.3.
244 5 Freedom from defects
245 The wires shall be smooth and free from all imperfections such as cracks, roughness, grooves,
246 inclusions and other defects which may compromise the performance of the final product.
247 6 Joints
248 No joints shall be made in the finished coated or cladded wire.
249 Joints may be made at any stage of processing prior to final cold drawing by the electric butt-
250 weld or flash-welding process.
251 Welding equipment and procedure shall be such that it can be demonstrated that the ultimate
252 tensile strength of a finished wire specimen containing the welded section shall be
253 not less than 96 % of the specified minimum stress at 1 % extension.
254 A welded section shall meet all other requirements, except the stress at 1 % extension,
255 elongation, torsion, bend, and wrap tests.
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256 No joints are allowed after heat treatment on wires, which will be used in single wire conductors.
257 7 Tests
258 7.1 General
259 Tests shall be made by the manufacturer on the wires to demonstrate their conformance to this
260 standard. Tests shall be made in accordance with Table A.2.
261 Tests shall be performed between 10°C and 30°C.
262 7.2 Place of testing
263 Unless otherwise agreed between the purchaser and the manufacturer at time of ordering, all
264 tests shall be carried out at the manufacturer’s works.
265 7.3 Sampling rate
266 Specimen for tests specified in clause 7.4 shall be taken by the manufacturer from samples of
267 at least 10% of each lot.
268 Alternatively, if a quality assessment procedure is in place and implemented, the sampling rate
269 shall be subject to agreement between the manufacturer and purchaser.
270 7.4 Test methods
271 7.4.1 Visual test
272 The surface of the wire shall be visually examined to ensure that it is smooth and free from all
273 imperfections including but not limited to cracks, unevenness, holes and inclusion of impurities.
274 7.4.2 Diameter
275 7.4.2.1 Unit for diameter
276 The nominal diameter of a wire shall be expressed in millimetres to two decimal places.
277 7.4.2.2 Diameter from direct measurements
278 The diameter of a round wire shall be the mean of two measurements at right angle taken at
279 the same cross-section. The measurement apparatus shall have an accuracy of at least 0,001
280 mm.
281 When tested in accordance with this sub clause the diameter shall not vary from its nominal
282 value by more than the appropriate value indicated in Table A.4, Table A.5, or Table A.6.
283 7.4.2.3 Diameter from weight measurements
284 The equivalent diameter of a formed wire shall be obtained from weight measurements made
285 on a sample not less than 1,0 m in length, and its density as defined in Table B.1.
286 The equivalent diameter, D of the formed wire shall be calculated by the Formula (1).
4𝐴𝐴
287 D = (1)
�
𝜋𝜋𝜋𝜋𝜋𝜋
288 Where:
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289 D is the equivalent diameter of the sample in mm
290 A is the weight of the sample with Length L in g
291 L is the length of the sample in m
292 𝜌𝜌 is the density of the sample in g/cm³
293 When tested in accordance with this sub clause the equivalent diameter shall not vary from its
294 nominal value by more than the tolerance value indicated in Table A.4, Table A.5, or Table A.6.
295 7.4.2.4 Diameter from volume measurement
296 Alternatively the equivalent diameter of a formed wire shall be obtained from volume and weight
297 measurements as described in the informative Annex C.
298 When tested in accordance with this sub clause the equivalent diameter shall not vary from its
299 nominal value by more than the tolerance value indicated in Table A.4, Table A.5, or Table A.6.
300 7.4.3 Stress at 1% extension, tensile strength and elongation
301 7.4.3.1 Sample preparation
302 The wire samples shall be free from bends or kinks other than the curvature resulting from the
303 usual coiling operation. It shall be straightened before inserting in the grips of the tensile testing
304 equipment with a roller type wire straightening arrangement or by any other means designed to
305 exert the minimum effect upon the mechanical properties of the sample. Samples for tests shall
306 not be less than 450 mm long and shall be fitted in the testing machine so as to leave a free
307 length of minimum 300 mm between the grips.
308 7.4.3.2 Stress at 1% extension and tensile strength
309 The test shall be performed in accordance with ISO 6892-1.
310 The force-measuring system of the testing machine shall be calibrated in accordance with ISO
311 7500-1, class 1,or better.
312 The rate of separation of the jaws of the testing machine shall be between 25 mm/min and 100
313 mm/min.
314 In order to obtain a straight test piece and ensure the alignment of the test piece and grip
315 arrangement, a preliminary load corresponding with the initial stress in accordance with Table
316 A.7 shall be applied.
317 This load shall be maintained while a 250 mm gauge is marked on the sample and a suitable
318 extensometer applied on a 250 mm gauge length (not necessarily corresponding with the
319 marked gauge length).
320 A correction of the extension, in accordance with Table A.7, should be carried out to take into
321 account the effect of the preliminary load.
322 This load shall then be increased uniformly until the extensometer indicates an extension of 2,5
323 mm in 250 mm (1% extension).
324 At this point the tensile testing equipment may be stopped if necessary, and the load read. The
325 value of stress at 1% extension is calculated by dividing this load by the area of the wire based
326 on wire diameter measurements as per clause 7.3.2. Following this operation, the extensometer
327 may be removed. The specimen shall then be loaded to rupture and its tensile strength
328 determined.
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329 When tested in accordance with this sub clause the wire shall conform to the requirements
330 prescribed in Table A.4, Table A.5, or Table A.6.
331 7.4.3.3 Elongation after break
332 The test shall be performed in accordance with ISO 6892-1.
333 The gauge length to be applied is 250 mm.
334 When tested in accordance with this sub clause the wire shall conform to the requirements
335 prescribed in Table A.4, Table A.5, or Table A.6.
336 7.4.3.4 Elongation at break
337 The test shall be performed in accordance with ISO 6892-1.
338 The gauge length to be applied is 250 mm.
339 When tested in accordance with this clause the wire shall conform to the requirements
340 prescribed in Table A.5, or Table A.6.
341 7.4.4 Ductility tests
342 7.4.4.1 Torsion test
343 The test shall be performed in accordance with ISO 7800.
344 The free length between the grips will be 100 times the nominal diameter.
345 The number of torsions obtained shall not be less than the value given in Table A.4, Table A.5
346 or Table A.6.
347 7.4.4.2 Wrapping test
348 The test shall be performed in accordance with ISO 7802.
349 The specimen shall be wrapped 8 turns in a close spiral around a mandrel, at a rate not
350 exceeding 15 turns per minute.
351 The mandrel diameter shall be in accordance with the value given in Table A.4, Table A.5, or
352 Table A.6.
353 When tested in accordance with this clause, the sample shall not completely break.
354 7.4.4.3 Reverse bend test
355 The test shall be performed in accordance with ISO 7801.
356 The minimum number of reverse bends to be achieved shall be agreed between purchaser and
357 manufacturer.
358 Note : to have a reference on the minimum achievable reverse bends one can refer to ISO 2232 Quality A.
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359 7.4.5 Coating or cladding tests
360 7.4.5.1 Coating mass or cladding thickness test
361 7.4.5.1.1 Zinc or zinc-aluminium alloy coating mass
362
...
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