IEC 60332-3-21:2018
(Main)Tests on electric and optical fibre cables under fire conditions - Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category A F/R
Tests on electric and optical fibre cables under fire conditions - Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category A F/R
IEC 60332-3-21:2018 covers category A F/R for methods of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, under defined conditions. This document relates only to power cables of conductor cross-sectional area greater than 35 mm2 installed on the test ladder in a spaced configuration on the front and rear to achieve a nominal total volume of non-metallic material of 7 l/m of test sample. The flame application time is 40 min. This method of mounting is intended for special cable designs used in particular installations when required in the cable specification. Category A F/R is not intended for general use. The test is intended for type approval testing. The requirements for the selection of cables for testing are given in Annex A. The flame spread is measured as the extent of damage of the cable sample. This procedure can be used to demonstrate the cable’s ability to limit flame spread. A recommended performance requirement is given in Annex B.^This second edition cancels and replaces the first edition published in 2000. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) adjustments have been made to the title, and elsewhere, to emphasise the standard is applicable to optical fibre cables as well as metallic conductor types;
b) details of the way in which cables are mounted on the ladder have been better defined in order to improve repeatability and reproducibility.
It has the status of a group safety publication in accordance with IEC Guide 104.
Essais des câbles électriques et des câbles à fibres optiques soumis au feu - Partie 3-21: Essai de propagation verticale de la flamme des fils ou câbles montés en nappes en position verticale - Catégorie A F/R
L’IEC 60332-3-21:2018 couvre la catégorie A F/R pour les méthodes d'essai pour l'évaluation de la propagation verticale de la flamme des fils ou câbles, disposés en nappes en position verticale, dans des conditions définies. Le présent document concerne uniquement les câbles d'énergie ayant au moins un conducteur de section supérieure à 35 mm2 installés sur l'échelle d'essai dans une configuration espacée sur la face avant et la face arrière afin d’obtenir un volume nominal total de matériau non métallique de 7 l/m d'échantillon d'essai. La durée d'application de la flamme est de 40 min. Cette méthode de montage est prévue pour les constructions de câbles spéciales utilisées dans des installations particulières lorsque cela est requis dans la spécification de câble. La catégorie A F/R n'est pas prévue pour une utilisation générale. L'essai est prévu pour des essais d'acceptation de type. Les exigences pour la sélection des câbles pour l'acceptation de type sont données à l'Annexe A. La propagation de la flamme est mesurée comme étant l'étendue de la partie endommagée de l'échantillon de câble. Cette procédure peut être utilisée pour démontrer l’aptitude du câble à limiter la propagation de la flamme. L’Annexe B donne une recommandation pour l'exigence de performance. Cette deuxième édition annule et remplace la première édition parue en 2000. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) des ajustements ont été apportés au titre, et ailleurs, afin de souligner que la Norme s’applique aux câbles à fibre optique, ainsi qu’aux types de conducteurs métalliques;
b) les détails sur la manière dont les câbles sont montés sur l'échelle ont été mieux définis afin d'améliorer la répétabilité et la reproductibilité.
Elle a le statut d’une publication groupée de sécurité conformément au Guide IEC 104.
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IEC 60332-3-21 ®
Edition 2.0 2018-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
GROUP SAFETY PUBLICATION
Tests on electric and optical fibre cables under fire conditions –
Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires
or cables – Category A F/R
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC 60332-3-21 ®
Edition 2.0 2018-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
GROUP SAFETY PUBLICATION
Tests on electric and optical fibre cables under fire conditions –
Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires
or cables – Category A F/R
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40; 29.060.20 ISBN 978-2-8322-5877-4
– 2 – IEC 60332-3-21:2018 RLV © IEC 2018
CONTENTS
FOREWORD .3
INTRODUCTION .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 Test apparatus .7
4.1 General .7
4.2 Ignition source .7
5 Test procedure .7
5.1 Test sample .7
5.2 Determination of the number of test pieces .8
5.3 Mounting of the test sample .8
5.4 Flame application time .9
6 Evaluation of test results .9
7 Performance requirements .9
8 Retest procedure .9
9 Test report .9
Annex A (normative) Guidance on cable selection for type approval testing . 11
Annex B (informative) Recommended performance requirements . 12
Bibliography . 13
Figure 1 – Typical arrangement and spacing of cables mounted on both sides of the
standard ladder (category A F/R) . 10
Table A.1 – Summary of test conditions . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 3-21: Test for vertical flame spread of
vertically-mounted bunched wires or cables – Category A F/R
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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60332-3-21:2018 RLV © IEC 2018
International Standard IEC 60332-3-21 has been prepared by IEC technical committee 20:
Electric cables.
This second edition cancels and replaces the first edition published in 2000. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) adjustments have been made to the title, and elsewhere, to emphasise the standard is
applicable to optical fibre cables as well as metallic conductor types;
b) details of the way in which cables are mounted on the ladder have been better defined in
order to improve repeatability and reproducibility.
It has the status of a group safety publication in accordance with IEC Guide 104.
The text of this International Standard is based on the following documents:
FDIS Report on voting
20/1798/FDIS 20/1815/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60332 series, published under the general title Tests on electric
and optical fibre cables under fire conditions, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of
existing standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this publication using a
colour printer.
INTRODUCTION
IEC 60332-3-21 is part of a series of publications dealing with tests on electric and optical
fibre cables under fire conditions.
The IEC 60332-1 and IEC 60332-2 series specify methods of test for flame spread
characteristics for a single vertical insulated wire or cable. It cannot be assumed that,
because a cable or wire meets the requirements of the IEC 60332-1 and IEC 60332-2 series,
a vertical bunch of similar cables or wires will behave in a similar manner. This is because
flame spread along a vertical bunch of cables depends on a number of features, such as
a) the volume of combustible material exposed to the fire and to any flame which may be
produced by the combustion of the cables;
b) the geometrical configuration of the cables and their relationship to an enclosure;
c) the temperature at which it is possible to ignite the gases emitted from the cables;
d) the quantity of combustible gas released from the cables for a given temperature rise;
e) the volume of air passing through the cable installation;
f) the construction of the cable, for example armoured or unarmoured, multi- or single-core.
All of the foregoing assume that the cables are able to be ignited when involved in an
external fire.
The IEC 60332-3 series gives details of a test where a number of cables are bunched
together to form various test sample installations. For easier use and differentiation of the
various test categories, the parts are designated as follows:
Part 3-10: Apparatus
Part 3-21: Category A F/R
Part 3-22: Category A
Part 3-23: Category B
Part 3-24: Category C
Part 3-25: Category D
Parts from 3-21 onwards define the various categories and the relevant procedures. The
categories are distinguished by test duration, the volume of non-metallic material of the test
sample and the method of mounting the sample for the test. In all categories, cables having
at least one conductor of cross-sectional area greater than 35 mm are tested in a spaced
configuration, whereas cables of conductor cross-sectional area of 35 mm or smaller and
optical fibre cables are
...
IEC 60332-3-21 ®
Edition 2.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Tests on electric and optical fibre cables under fire conditions –
Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires or
cables – Category A F/R
Essais des câbles électriques et des câbles à fibres optiques soumis au feu –
Partie 3-21: Essai de propagation verticale de la flamme des fils ou câbles
montés en nappes en position verticale – Catégorie A F/R
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60332-3-21 ®
Edition 2.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Tests on electric and optical fibre cables under fire conditions –
Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires or
cables – Category A F/R
Essais des câbles électriques et des câbles à fibres optiques soumis au feu –
Partie 3-21: Essai de propagation verticale de la flamme des fils ou câbles
montés en nappes en position verticale – Catégorie A F/R
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.060.20 ISBN 978-2-8322-5796-8
– 2 – IEC 60332-3-21:2018 © IEC 2018
CONTENTS
FOREWORD .3
INTRODUCTION .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .6
4 Test apparatus .7
4.1 General .7
4.2 Ignition source .7
5 Test procedure .7
5.1 Test sample .7
5.2 Determination of the number of test pieces .7
5.3 Mounting of the test sample .8
5.4 Flame application time .9
6 Evaluation of test results .9
7 Performance requirements .9
8 Retest procedure .9
9 Test report .9
Annex A (normative) Guidance on cable selection for type approval testing . 11
Annex B (informative) Recommended performance requirements . 12
Bibliography . 13
Figure 1 – Typical arrangement and spacing of cables mounted on both sides of the
standard ladder (category A F/R) . 10
Table A.1 – Summary of test conditions . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 3-21: Test for vertical flame spread of
vertically-mounted bunched wires or cables – Category A F/R
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.
International Standard IEC 60332-3-21 has been prepared by IEC technical committee 20:
Electric cables.
This second edition cancels and replaces the first edition published in 2000. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) adjustments have been made to the title, and elsewhere, to emphasise the standard is
applicable to optical fibre cables as well as metallic conductor types;
b) details of the way in which cables are mounted on the ladder have been better defined in
order to improve repeatability and reproducibility.
– 4 – IEC 60332-3-21:2018 © IEC 2018
It has the status of a group safety publication in accordance with IEC Guide 104.
The text of this International Standard is based on the following documents:
FDIS Report on voting
20/1798/FDIS 20/1815/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60332 series, published under the general title Tests on electric
and optical fibre cables u
...
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