Short-circuit temperature limits of electric cables with rated voltages of 1 kV (<i>U</i><sub>m</sub> = 1,2 kV) and 3 kV (<i>U</i><sub>m</sub> = 3,6 kV)

Gives guidance on the short-circuit maximum temperature limits of electric cables having rated voltages of 1kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV), with regard to the following: - insulating materials; - oversheath and bedding materials; - conductor and metallic sheath materials and methods of connection. The design and accessories and the influence of the installation conditions on the temperature limits are taken into consideration.

Limites de température de court-circuit des câbles électriques de tensions assignées de 1 kV (<i>U</i><sub>m</sub> = 1,2 kV) et 3 kV (<i>U</i><sub>m</sub> = 3,6 kV)

Donne des indications sur les limites de température maximales de court-circuit des câbles électriques de tension assignées de 1kV (Um = 1,3 kV) et 3 kV (Um = 3,6 kV), en ce qui concerne: - les matériaux d'isolation; - les matériaux de gainage et de bourrage; - les matériaux de l'âme et de la gaine métallique et les méthodes de raccordement. La conception des accessoires et l'influence des conditions d'installation sur les limites de température sont prises en compte.

General Information

Status
Published
Publication Date
08-Oct-2000
Technical Committee
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
30-Sep-2000
Completion Date
09-Oct-2000
Ref Project

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IEC 60724:2000 - Short-circuit temperature limits of electric cables with rated voltages of 1 kV (<i>U</i><sub>m</sub> = 1,2 kV) and 3 kV (<i>U</i><sub>m</sub> = 3,6 kV)
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IEC 60724:2000+AMD1:2008 CSV - Short-circuit temperature limits of electric cables with rated voltages of 1 kV (<em>U</em><sub>m</sub> = 1,2 kV) and 3 kV (<em>U</em><sub>m</sub> = 3,6 kV) Released:11/13/2008 Isbn:9782889102594
English and French language
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NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2000-10
Limites de température de court-circuit
des câbles électriques de tensions assignées
de 1 kV (U = 1,2 kV) et 3 kV (U = 3,6 kV)
m m
Short-circuit temperature limits of electric cables
with rated voltages of 1 kV (U = 1,2 kV)
m
and 3 kV (U = 3,6 kV)
m
Numéro de référence
Reference number
CEI/IEC 60724:2000
Numéros des publications Numbering
Depuis le 1er janvier 1997, les publications de la CEI As from 1 January 1997 all IEC publications are
sont numérotées à partir de 60000. issued with a designation in the 60000 series.
Publications consolidées Consolidated publications
Les versions consolidées de certaines publications de Consolidated versions of some IEC publications
la CEI incorporant les amendements sont disponibles. including amendments are available. For example,
Par exemple, les numéros d’édition 1.0, 1.1 et 1.2 edition numbers 1.0, 1.1 and 1.2 refer, respectively, to
indiquent respectivement la publication de base, la the base publication, the base publication incor-
publication de base incorporant l’amendement 1, et la porating amendment 1 and the base publication
publication de base incorporant les amendements 1 incorporating amendments 1 and 2.
et 2.
Validité de la présente publication Validity of this publication
Le contenu technique des publications de la CEI est The technical content of IEC publications is kept
constamment revu par la CEI afin qu'il reflète l'état under constant review by the IEC, thus ensuring that
actuel de la technique. the content reflects current technology.
Des renseignements relatifs à la date de reconfir- Information relating to the date of the reconfirmation
mation de la publication sont disponibles dans le of the publication is available in the IEC catalogue.
Catalogue de la CEI.
Les renseignements relatifs à des questions à l’étude et Information on the subjects under consideration and
des travaux en cours entrepris par le comité technique work in progress undertaken by the technical
qui a établi cette publication, ainsi que la liste des committee which has prepared this publication, as well
publications établies, se trouvent dans les documents ci- as the list of publications issued, is to be found at the
dessous: following IEC sources:
• « Site web» de la CEI* • IEC web site*
• Catalogue des publications de la CEI • Catalogue of IEC publications
Publié annuellement et mis à jour Published yearly with regular updates
régulièrement
(Catalogue en ligne)* (On-line catalogue)*
• Bulletin de la CEI • IEC Bulletin
Disponible à la fois au «site web» de la CEI* Available both at the IEC web site* and
et comme périodique imprimé as a printed periodical
Terminologie, symboles graphiques Terminology, graphical and letter
et littéraux symbols
En ce qui concerne la terminologie générale, le lecteur For general terminology, readers are referred to
se reportera à la CEI 60050: Vocabulaire Electro- IEC 60050: International Electrotechnical Vocabulary
technique International (VEI). (IEV).
Pour les symboles graphiques, les symboles littéraux For graphical symbols, and letter symbols and signs
et les signes d'usage général approuvés par la CEI, le approved by the IEC for general use, readers are
lecteur consultera la CEI 60027: Symboles littéraux à referred to publications IEC 60027: Letter symbols to
utiliser en électrotechnique, la CEI 60417: Symboles be used in electrical technology, IEC 60417: Graphical
graphiques utilisables sur le matériel. Index, relevé et symbols for use on equipment. Index, survey and
compilation des feuilles individuelles, et la CEI 60617: compilation of the single sheets and IEC 60617:
Symboles graphiques pour schémas. Graphical symbols for diagrams.
* Voir adresse «site web» sur la page de titre. * See web site address on title page.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2000-10
Limites de température de court-circuit
des câbles électriques de tensions assignées
de 1 kV (U = 1,2 kV) et 3 kV (U = 3,6 kV)
m m
Short-circuit temperature limits of electric cables
with rated voltages of 1 kV (U = 1,2 kV)
m
and 3 kV (U = 3,6 kV)
m
 IEC 2000 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
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CODE PRIX
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PRICE CODE
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 60724  CEI:2000
SOMMAIRE
Pages
AVANT-PROPOS . 4
INTRODUCTION .6
Articles
1 Domaine d'application . 8
2 Références normatives. 8
3 Facteurs gouvernant l'application des limites de température. 8
3.1 Généralités . 8
3.2 Câbles . 10
3.3 Accessoires . 10
3.4 Conditions d'installation. 12
4 Températures maximales de court-circuit admissibles pour les câbles de tensions
assignées de 1 kV (U = 1,2 kV) et 3 kV (U = 3,6 kV) . 12

m m
4.1 Matériaux de l’enveloppe isolante. 14
4.2 Matériaux de gainage et de bourrage, en l'absence de prescriptions électriques
ou autres . 14
4.3 Matériaux d’âme, d’écran ou de gaine métallique, d’armure, et méthodes de
raccordement. 16

60724  IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .7
Clause
1 Scope . 9
2 Normative references . 9
3 Factors governing the application of the temperature limits . 9
3.1 General. 9
3.2 Cables . 11
3.3 Accessories . 11
3.4 Installation conditions. 13
4 Maximum permissible short-circuit temperatures for cables with rated voltages of 1 kV
(U = 1,2 kV) and 3 kV (U = 3,6 kV) . 13

m m
4.1 Insulation materials . 15
4.2 Oversheath and bedding materials where there are no electrical or other
requirements. 15
4.3 Conductor/metallic sheath/screen/armour materials and methods of connection . 17

– 4 – 60724  CEI:2000
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
–––––––––––
LIMITES DE TEMPÉRATURE DE COURT-CIRCUIT
DES CÂBLES ÉLECTRIQUES DE TENSIONS ASSIGNÉES
DE 1 kV (U = 1,2 kV) ET 3 kV (U = 3,6 kV)

m m
AVANT-PROPOS
1) La CEI (Commission Electrotechnique Internationale) est une organisation mondiale de normalisation composée
de l’ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l’électricité et de l’électronique. A cet effet, la CEI, entre autres activités, publie des Normes Internationales.
Leur élaboration est confiée à des comités d’études, aux travaux desquels tout Comité national intéressé par le
sujet peut participer. Les organisations internationales, gouvernementales et non gouvernementales, en liaison
avec la CEI, participent également aux travaux. La CEI collabore étroitement avec l’Organisation Internationale
de Normalisation (ISO), selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques, représentent, dans la mesure
du possible un accord international sur les sujets étudiés, étant donné que les Comités nationaux intéressés
sont représentés dans chaque comité d’études.
3) Les documents produits se présentent sous la forme de recommandations internationales. Ils sont publiés
comme normes, spécifications techniques, rapports techniques ou guides et agréés comme tels par les Comités
nationaux.
4) Dans le but d'encourager l'unification internationale, les Comités nationaux de la CEI s’engagent à appliquer de
façon transparente, dans toute la mesure possible, les Normes Internationales de la CEI dans leurs normes
nationales et régionales. Toute divergence entre la norme de la CEI et la norme nationale ou régionale
correspondante doit être indiquée en termes clairs dans cette dernière.
5) La CEI n’a fixé aucune procédure concernant le marquage comme indication d’approbation et sa responsabilité
n’est pas engagée quand un matériel est déclaré conforme à l’une de ses normes.
6) L’attention est attirée sur le fait que certains des éléments de la présente Norme internationale peuvent faire
l’objet de droits de propriété intellectuelle ou de droits analogues. La CEI ne saurait être tenue pour
responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 60724 a été établie par le comité d'études 20 de la CEI: Câbles
électriques.
Cette troisième édition annule et remplace la deuxième édition, parue comme guide en 1984.
Elle a été révisée pour s’adapter aux tensions assignées et aux matériaux de la CEI 60502-1.
Le texte de cette norme est issu des documents suivants:
FDIS Rapport de vote
20/399/FDIS 20/418/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l’approbation de cette norme.
Cette publication a été rédigée selon les Directives ISO/CEI, Partie 3.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2007. A cette
date, la publication sera
 reconduite;
 supprimée;
 remplacée par une édition révisée, ou
 amendée.
60724  IEC:2000 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SHORT-CIRCUIT TEMPERATURE LIMITS
OF ELECTRIC CABLES WITH RATED VOLTAGES
OF 1 kV (U = 1,2 kV) AND 3 kV (U = 3,6 kV)

m m
FOREWORD
1) 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 co-operation 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.
2) The formal decisions or agreements of the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
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divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
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5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60724 has been prepared by IEC technical committee 20: Electric
cables.
This third edition cancels and replaces the second edition, published as a guide in 1984. It has
been revised to accommodate rated voltages and materials as covered
...


IEC 60724 ®
Edition 3.1 2008-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Short-circuit temperature limits of electric cables with rated voltages
of 1 kV (U = 1,2 kV) and 3 kV (U = 3,6 kV)
m m
Limites de température de court-circuit des câbles électriques de tensions
assignées de 1 kV (U = 1,2 kV) et 3 kV (U = 3,6 kV)
m m
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IEC 60724 ®
Edition 3.1 2008-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Short-circuit temperature limits of electric cables with rated voltages

of 1 kV (U = 1,2 kV) and 3 kV (U = 3,6 kV)
m m
Limites de température de court-circuit des câbles électriques de tensions

assignées de 1 kV (U = 1,2 kV) et 3 kV (U = 3,6 kV)
m m
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.20 ISBN 978-2-8891-0259-4

– 2 – 60724 © IEC:2000+A1:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references.6
3 Factors governing the application of the temperature limits .6
3.1 General .6
3.2 Cables.7
3.3 Accessories.7
3.4 Installation conditions .8
4 Maximum permissible short-circuit temperatures for cables with rated voltages
of 1 kV (U = 1,2 kV) and 3 kV (U = 3,6 kV) .8

m m
4.1 Insulation materials.8
4.2 Oversheath and bedding materials where there are no electrical
or other requirements .9
4.3 Conductor/metallic sheath/screen/armour materials and methods of connection .9

Table 1 – Temperature limits for insulation materials .9
Table 2 – Temperature limits for oversheath materials.9
Table 3 – Temperature limits for current-carrying components .10

60724 © IEC:2000+A1:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SHORT-CIRCUIT TEMPERATURE LIMITS
OF ELECTRIC CABLES WITH RATED VOLTAGES
OF 1 kV (U = 1,2 kV) AND 3 kV (U = 3,6 kV)

m m
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.
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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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60724 edition 3.1 contains the third edition (2000) [documents 20/399/FDIS and
20/418/RVD] and its amendment 1 (2008) [documents 20/951/FDIS and 20/974/RVD].
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
International Standard IEC 60724 has been prepared by IEC technical committee 20: Electric
cables.
– 4 – 60724 © IEC:2000+A1:2008
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date,
the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60724 © IEC:2000+A1:2008 – 5 –
INTRODUCTION
Editorially, this third edition of IEC 60724 is brought into line with IEC 60986, second edition,
and IEC 61443, first edition.
The following four aspects may be applicable when selecting the short-circuit rating of a cable
system:
a) the permissible maximum temperature limits for cable components (e.g. conductor,
insulation, screen or metallic sheath, bedding, armour and oversheath). For practical
purposes, the energy producing the temperature rise is usually expressed by an equivalent
(I t) value so that the permitted maximum duration for a given short-circuit current can be
calculated;
b) the maximum value of current which will not cause mechanical failure (such as bursting)
due to electromagnetic forces. Irrespective of any temperature limitations, this determines a
maximum current which should not be exceeded;
c) the thermal performance of joints and terminations at the limits of current and duration
specified for the associated cable. Accessories should also withstand the thermo-
mechanical and electromagnetic forces produced by the short-circuit current in the cable;
d) the influence of installation conditions on the above three aspects.
Aspect a) is dealt with in detail, and the limits given are based on a consideration of the cable
only. A single short-circuit application is not expected to produce any significant damage to the
cable, but repeated short-circuits may cause cumulative damage. Guidance is given, where
appropriate, on aspects c) and d) mainly as they concern thermo-mechanical
...

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