IEC 60332-3-22:2000
(Main)Tests on electric cables under fire conditions - Part 3-22: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category A
Tests on electric cables under fire conditions - Part 3-22: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category A
IEC 60332-3-22:2000 Specifies method of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions. The test is intended for type approval testing. The requirements for the selection of cables for testing are given. The flame spread is measured as the extent of damage of the cable sample. This procedure may be used to demonstrate the cable's ability to limit flame spread. Covers category A and relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 7 l/m of test sample. The flame application time is 40 min. The method of mounting uses the front of the ladder, a standard or wide ladder being used for cables having a conductor cross-section greater than 35 mm2 according to the number of test pieces required, and a standard ladder for conductor cross-sections 35 mm2 and smaller. The category is intended for general use where high volumes of non-metallic material are required to be evaluated. A recommended performance requirement is also given. It has the status of a horizontal standard in accordance with IEC Guide 104.
Essais des câbles électriques soumis au feu - Partie 3-22: Essai de propagation verticale de la flamme des fils ou câbles en nappes en position verticale - Catégorie A
IEC 60332-3-22:2000 Spécifie méthode d'essai pour l'évaluation de la propagation verticale de la flamme des fils ou câbles électriques ou optiques, disposés en nappes en position verticale, dans des conditions définies. L'essai est prévu pour les essais d'acceptation de type. Les exigences pour la sélection des câbles pour l'acceptation de type sont données. 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. Couvre la catégorie A et concerne les câbles montés sur l'échelle d'essai afin d'obtenir un volume total nominal de matériau non métallique de 7 l/m d'échantillon d'essai. La durée d'application de la flamme est de 40 min. La méthode de montage utilise la face avant de l'échelle, celle-ci étant du type standard ou du type large pour les câbles dont au moins un conducteur est de section supérieure à 35 mm2 selon le nombre d'éprouvettes prescrit, et du type standard pour les câbles dont tous les conducteurs sont de sections inférieures ou égales à 35 mm2. Cette catégorie est prévue pour une utilisation générale lorsqu'il est prescrit d'évaluer le comportement de volumes élevés de matériau non métallique. Donne aussi une recommandation pour la prescription de performance. Elle a le statut de norme horizontale conformément au IEC Guide 104.
General Information
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Standards Content (Sample)
NORME CEI
INTERNATIONALE IEC
60332-3-22
INTERNATIONAL
Première édition
STANDARD
First edition
2000-10
PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Essais des câbles électriques soumis au feu –
Partie 3-22:
Essai de propagation verticale de la flamme des
fils ou câbles en nappes en position verticale –
Catégorie A
Tests on electric cables under fire conditions –
Part 3-22:
Test for vertical flame spread of vertically-mounted
bunched wires or cables – Category A
Numéro de référence
Reference number
CEI/IEC 60332-3-22:2000
Numérotation des publications Publication 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. Ainsi, la CEI 34-1 issued with a designation in the 60000 series. For
devient la CEI 60034-1. example, IEC 34-1 is now referred to as IEC 60034-1.
Editions consolidées Consolidated editions
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exemple, les numéros d’édition 1.0, 1.1 et 1.2 indiquent and 1.2 refer, respectively, to the base publication,
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NORME CEI
INTERNATIONALE IEC
60332-3-22
INTERNATIONAL
Première édition
STANDARD
First edition
2000-10
PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Essais des câbles électriques soumis au feu –
Partie 3-22:
Essai de propagation verticale de la flamme des
fils ou câbles en nappes en position verticale –
Catégorie A
Tests on electric cables under fire conditions –
Part 3-22:
Test for vertical flame spread of vertically-mounted
bunched wires or cables – Category A
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
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– 2 – 60332-3-22 © CEI:2000
SOMMAIRE
Pages
AVANT-PROPOS . 4
INTRODUCTION .8
Articles
1 Domaine d'application . 10
2 Références normatives. 10
3 Définitions. 12
4 Appareillage d'essai . 12
4.1 Généralités . 12
4.2 Source d'allumage . 12
5 Procédure d'essai . 12
5.1 Echantillon d’essai . 12
5.2 Détermination du nombre de tronçons de câble . 14
5.3 Montage de l’échantillon d’essai . 14
5.4 Durée d'application de la flamme. 16
6 Evaluation des résultats d'essai. 16
7 Prescriptions de performance. 18
8 Procédure de contre-essai. 18
9 Rapport d'essai . 18
Annexe A (normative) Lignes directrices pour la sélection des câbles pour l'essai
d'acception de type. 24
Annexe B (informative) Recommandation de prescriptions de performance . 26
Figure 1 – Câbles montés en disposition espacée sur la face avant de l'échelle standard . 20
Figure 2 – Câbles montés en disposition espacée sur la face avant de l'échelle large. 20
Figure 3 – Câbles montés en disposition jointive sur la face avant de l'échelle standard
(rangées de câbles en contact) . 22
Tableau A.1 – Résumé des conditions d'essai. 24
60332-3-22 © IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .9
Clause
1 Scope . 11
2 Normative references . 11
3 Definitions. 13
4 Test apparatus . 13
4.1 General. 13
4.2 Ignition source . 13
5 Test procedure. 13
5.1 Test sample . 13
5.2 Determination of the number of test pieces. 15
5.3 Mounting of the test sample . 15
5.4 Flame application time . 17
6 Evaluation of test results . 17
7 Performance requirements . 19
8 Retest procedure. 19
9 Test report . 19
Annex A (normative) Guidance on cable selection for type approval testing . 25
Annex B (informative) Recommended performance requirements. 27
Figure 1 – Spaced cables mounted on the front side of the standard ladder. 21
Figure 2 – Spaced cables mounted on the front side of the wide ladder . 21
Figure 3 – Touching cables mounted on front side of the standard ladder (arrays of
cables in contact) . 23
Table A.1 – Summary of test conditions . 25
– 4 – 60332-3-22 © CEI:2000
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
ESSAIS DES CÂBLES ÉLECTRIQUES SOUMIS AU FEU –
Partie 3-22: Essai de propagation verticale de la flamme des fils ou câbles
en nappes en position verticale – Catégorie A
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 traité 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
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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 60332-3-22 a été préparée par le comité d'études 20 de la CEI:
Câbles électriques.
Elle a le statut d’une publication groupée de sécurité conformément au Guide CEI 104.
La CEI 60332-3-22 fait partie d’une série de publications traitant des essais des câbles
électriques soumis au feu; la série remplace la CEI 60332-3, publiée en 1992. Les parties de la
série sont décrites dans l’introduction.
Toutes les catégories d'essais déjà existantes ont été retenues et mises à jour. Une nouvelle
catégorie (catégorie D) a été rajoutée afin de satisfaire aux besoins d’essai avec des volumes
de matériaux non métalliques très faibles.
Le texte de cette norme est issu des documents suivants:
FDIS Rapport de vote
20/404/FDIS 20/428/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.
60332-3-22 © IEC:2000 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS ON ELECTRIC CABLES UNDER FIRE CONDITIONS –
Part 3-22: Test for vertical flame spread of vertically-mounted
bunched wires or cables – Category A
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
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
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 60332-3-22 has been prepared by IEC technical committee 20:
Electric cables.
It has the status of a group safety publication in accordance with IEC Guide 104.
IEC 60332-3-22 forms one of a series of publications dealing with tests on electric cables
under fire conditions; the series supersedes IEC 60332-3 published in 1992. The parts of the
series are described in the introduction.
All pre-existing categories of test are retained and updated. A new category (category D) has
been added to cater for testing at very low non-metallic volumes.
The text of this standard is based on the following documents:
FDIS Report on voting
20/404/FDIS 20/428/RVD
Full information on the voting for the approval of this 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 3.
– 6 – 60332-3-22 © CEI:2000
L’annexe A fait partie intégrante de cette norme.
L’annexe B est donnée uniquement à titre d’information.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2008. A cette
date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
•
amendée.
60332-3-22 © IEC:2000 – 7 –
Annex A forms an integral part of this standard.
Annex B is for information only.
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
– 8 – 60332-3-22 © CEI:2000
INTRODUCTION
Les parties 1 et 2 de la CEI 60332 spécifient des méthodes d'essai pour caractériser la
propagation de la flamme sur un fil isolé ou un câble seul en position verticale. On ne peut pas
présumer que lorsqu'un fil ou câble satisfait aux prescriptions des parties 1 et 2, des fils ou
câbles similaires disposés en nappe en position verticale se comporteront de la même façon.
Cela est dû au fait que la propagation de la flamme le long d'une nappe de câbles en position
verticale dépend d'un certain nombre de paramètres, tels que
a) le volume des matériaux combustibles exposés au feu et aux flammes qui peuvent être
produites par la combustion des câbles;
b) la configuration géométrique des câbles et leur situation par rapport à leur environnement;
c) la température à laquelle il est possible d'enflammer les gaz émis par les câbles;
d) la quantité de gaz combustible émis par les câbles pour une élévation de température
donnée;
e) le volume d'air passant à travers l'installation des câbles;
f) la construction des câbles, par exemple armés ou non armés, mono ou multiconducteurs.
Tout ce qui précède présume que les câbles peuvent être enflammés lorsqu'ils sont impliqués
dans un incendie externe.
La partie 3 de la CEI 60332 donne les détails d'un essai où un certain nombre de câbles sont
disposés en nappes pour former différentes installations des échantillons. Pour être d’un usage
plus facile et pour différencier les différentes catégories d'essais, les parties sont désignées
comme suit:
Partie 3-10: Appareillage
Partie 3-21: Catégorie A F/R
Partie 3-22: Catégorie A
Partie 3-23: Catégorie B
Partie 3-24: Catégorie C
Partie 3-25: Catégorie D
Les parties 3-21 et au-delà définissent les différentes catégories et les procédures qui s'y
rapportent. Les catégories sont distinguées par la durée de l'essai, le volume de matériaux non
métalliques de l'échantillon d'essai et la méthode de montage de l'échantillon pour l'essai.
Dans toutes les catégories, les câbles dont au moins un conducteur est de section supérieure
à 35 mm sont essayés dans une configuration espacée, tandis que les câbles dont les
conducteurs sont d'une section inférieure ou égale à 35 mm sont essayés dans une
configuration jointive.
Les catégories ne sont pas nécessairement liées à différents niveaux de sécurité dans les
installations de câbles réelles. La configuration réelle des câbles installés peut être un élément
déterminant majeur dans le niveau de propagation de la flamme survenant dans un incendie
réel.
La méthode de montage décrite en catégorie A F/R (partie 3-21) est destinée aux câbles
spéciaux utilisés dans des installations particulières.
Les catégories A, B, C et D (parties 3-22 à 3-25 respectivement) sont pour un usage général là
où des volumes de matériaux non métalliques différents sont impliqués.
Des catégories additionnelles, en particulier destinées à couvrir l'utilisation des câbles de
communication de petit diamètre en configuration de faisceaux jointifs, seront étudiés
ultérieurement, lorsqu'un plus grand nombre de résultats chiffrés sera disponible.
60332-3-22 © IEC:2000 – 9 –
INTRODUCTION
Parts 1 and 2 of IEC 60332 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 parts 1 and 2, 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.
Part 3 of IEC 60332 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 mm² are tested in a spaced
configuration, whereas cables of conductor cross-sectional area of 35 mm² or smaller are
tested in a touching configuration.
The categories are not necessarily related to different safety levels in actual cable installations.
The actual installed configuration of the cables may be a major determinant in the level of
flame spread occurring in an actual fire.
The method of mounting described as category A F/R (part 3-21) is intended for special cable
designs used in particular installations.
Categories A, B, C and D (parts 3-22 to 3-25 respectively) are for general use where different
non-metallic volumes are applicable.
Additional categories, especially to cover the use of small diameter communication cables in
closely bunched configurations, will be further considered when more data are available.
– 10 – 60332-3-22 © CEI:2000
ESSAIS DES CÂBLES ÉLECTRIQUES SOUMIS AU FEU –
Partie 3-22: Essai de propagation verticale de la flamme des fils ou câbles
en nappes en position verticale – Catégorie A
1 Domaine d'application
La série de Normes internationales couvertes par les parties 3-10, 3-21, 3-22, 3-23, 3-24 et
3-25 de la CEI 60332 spécifie des méthodes d'essai pour l'évaluation de la propagation
verticale de la flamme des fils ou câbles électriques ou optiques, disposés en nappes en
position verticale, dans des conditions définies.
NOTE Pour les besoins de la présente norme, le terme « fils ou câbles électriques » couvre tous les câbles isolés
à conducteur métallique utilisés pour le transport d'énergie ou de signaux.
L'essai est prévu pour les 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.
La présente partie de la CEI 60332 couvre la catégorie A et concerne les câbles montés sur
l'échelle d'essai afin d’obtenir un volume total nominal de matériau non métallique de 7 l/m
d'échantillon d'essai. La durée d'application de la flamme est de 40 min. La méthode de
montage utilise la face avant de l'échelle, celle-ci étant du type standard ou du type large pour
les câbles dont au moins un conducteur est de section supérieure à 35 mm selon le nombre
d'éprouvettes prescrit, et du type standard pour les câbles dont tous les conducteurs sont de
sections inférieures ou égales à 35 mm . Cette catégorie est prévue pour une utilisation
générale lorsqu’il est prescrit d'évaluer le comportement de volumes élevés de matériau non
métallique.
L’annexe B donne une recommandation pour la prescription de performance.
2 Références normatives
Les documents normatifs suivants contiennent des dispositions qui, par suite de la référence
qui y est faite, constituent des dispositions valables pour la présente partie de la CEI 60332.
Pour les références datées, les amendements ultérieurs ou les révisions de ces publications ne
s’appliquent pas. Toutefois, les parties prenantes aux accords fondés sur la présente partie de
la CEI 60332 sont invitées à rechercher la possibilité d’appliquer les éditions les plus récentes
des documents normatifs indiqués ci-après. Pour les références non datées, la dernière édition
du document normatif en référence s’applique. Les membres de la CEI et de l’ISO possèdent
le registre des Normes internationales en
...
IEC 60332-3-22 ®
Edition 1.1 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Tests on electric and optical fibre cables under fire conditions –
Part 3-22: Test for vertical flame spread of vertically-mounted bunched wires or
cables – Category A
Essais des câbles électriques et des câbles à fibres optiques soumis au feu –
Partie 3-22: Essai de propagation verticale de la flamme des fils ou câbles
montés en nappes en position verticale – Catégorie A
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IEC 60332-3-22 ®
Edition 1.1 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Tests on electric and optical fibre cables under fire conditions –
Part 3-22: Test for vertical flame spread of vertically-mounted bunched wires or
cables – Category A
Essais des câbles électriques et des câbles à fibres optiques soumis au feu –
Partie 3-22: Essai de propagation verticale de la flamme des fils ou câbles
montés en nappes en position verticale – Catégorie A
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CE
CODE PRIX
ICS 13.220.40; 29.020; 29.060.20 ISBN 978-2-88910-132-0
– 2 – 60332-3-22 © IEC:2000+A1:2008
CONTENTS
CONTENTS .2
FOREWORD.3
1 Scope.6
2 Normative references.6
3 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 .7
5.3 Mounting of the test sample .8
5.4 Flame application time.9
6 Evaluation of test results.9
7 Performance requirements.10
8 Retest procedure.10
9 Test report.10
Annex A (normative) Guidance on cable selection for type approval testing.13
Annex B (informative) Recommended performance requirements .14
Figure 1 – Spaced cables mounted on the front side of the standard ladder .11
Figure 2 – Spaced cables mounted on the front side of the wide ladder.11
Figure 3 – Touching cables mounted on front side of the standard ladder (arrays of
cables in contact).12
Table A.1 – Summary of test conditions.13
60332-3-22 © IEC:2000+A1:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 3-22: Test for vertical flame spread of vertically-mounted bunched
wires or cables – Category A
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the 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 60332-3-22 has been prepared by IEC technical committee 20:
Electric cables.
It has the status of a group safety publication in accordance with IEC Guide 104.
IEC 60332-3-22 forms one of a series of publications dealing with tests on electric cables
under fire conditions; the series supersedes IEC 60332-3 published in 1992. The parts of the
series are described in the introduction.
All pre-existing categories of test are retained and updated. A new category (category D) has
been added to cater for testing at very low non-metallic volumes.
– 4 – 60332-3-22 © IEC:2000+A1:2008
This consolidated version of IEC 60332-3-22 consists of the first edition (2000) [documents
20/404/FDIS and 20/428/RVD] and its amendment 1 (2008) [documents 20/934/CDV and
20/983A/RVC].
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
It bears the edition number 1.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
Annex A forms an integral part of this standard.
Annex B is for information only.
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.
60332-3-22 © IEC:2000+A1:2008 – 5 –
INTRODUCTION
Parts 1 and 2 of IEC 60332 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 parts 1 and 2, 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.
Part 3 of IEC 60332 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 mm² are tested in a spaced
configuration, whereas cables of conductor cross-sectional area of 35 mm or smaller and
optical cables are tested in a touching configuration.
The categories are not necessarily related to different safety levels in actual cable installations.
The actual installed configuration of the cables may be a major determinant in the level of
flame spread occurring in an actual fire.
The method of mounting described as category A F/R (part 3-21) is intended for special cable
designs used in particular installations.
Categories A, B, C and D (parts 3-22 to 3-25 respectively) are for general use where different
non-metallic volumes are applicable.
– 6 – 60332-3-22 © IEC:2000+A1:2008
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 3-22: Test for vertical flame spread of vertically-mounted bunched
wires or cables – Category A
1 Scope
The series of International Standards covered by Parts 3-10, 3-21, 3-22, 3-23, 3-24 and 3-25 of
IEC 60332 specifies methods of test for the assessment of vertical flame spread of vertically-
mounted bunched wires or cables, electrical or optical, under defined conditions.
NOTE For the purpose of this standard the term "electric wire or cable" covers all insulated metallic conductor
cables used for the conveyance of energy or signals.
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 may be used to demonstrate the cable’s ability to limit flame
spread.
This part of IEC 60332 covers category A and relates to cables installed on the test ladder to
achieve a nominal total volume of non-metallic material of 7 l/m of test sample. The flame
application time is 40 min. The method of mounting uses the front of the ladder, a standard or
wide ladder being used for cables having a conductor cross-section greater than 35 mm²
according to the number of test pieces required, and a standard ladder for conductor cross-
sections 35 mm² and smaller. The category is intended for general use where high volumes of
non-metallic material are required to be evaluated.
A recommended performance requirement is given in annex B.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 60332-3-10,Tests on electric cables under fire conditions – Part 3-10: Test for vertical
flame spread of vertically-mounted bunched wires or cables – Apparatus
IEC 60695-4, Fire hazard testing – Part 4: Terminology concerning fire tests
IEC 60811-1-3, Insulating and sheathing materials of electric cables – Common test methods
Part 1: General application – Section 3: Methods for determining the density – Water
absorption tests – Shrinkage test
IEC Guide 104, The preparation of safety publications and the use of basic safety publications
and group safety publications
60332-3-22 © IEC:2000+A1:2008 – 7 –
3 Definitions
For the purpose of this part of IEC 60332 the following definitions apply. The definitions are
taken from IEC 60695-4.
3.1
ignition source
source of energy that initiates combustion
3.2
char
carbonaceous residue resulting from pyrolysis or incomplete combustion
3.3
flame spread
propagation of a flame front
4 Test apparatus
4.1 General
The apparatus specified in IEC 60332-3-10 shall be used.
4.2 Ignition source
The ignition source shall be one or two ribbon-type propane gas burners as specified in
IEC 60332-3-10.
A single burner shall be used with the standard ladder and two burners with the wide ladder.
5 Test procedure
5.1 Test sample
The test sample shall comprise a number of test pieces of cable from the same production
length, each having a minimum length of 3,5 m.
The total number of test pieces in the test sample shall be that number required to provide a
nominal total volume of non-metallic material of 7 l/m of test sample.
The test sample shall be chosen within the limitations given in annex A.
The test pieces forming the test sample shall be conditioned at a temperature of (20 ± 10) °C
for at least 16 h before commencing the test. The test pieces shall be dry.
5.2 Determination of the number of test pieces
In order to calculate the appropriate number of test pieces, it is necessary to determine the
volume per metre of non-metallic material of one test piece.
A length of cable which shall be not less than 0,3 m long is carefully cut to ensure that the
surfaces are at right angles to the cable axis, thus enabling precise measurements of its length.
– 8 – 60332-3-22 © IEC:2000+A1:2008
The density of each non-metallic component (including cellular material) shall be measured in
an appropriate way, for example clause 8 of IEC 60811-1-3, in order to obtain values
expressed to the second decimal place.
Each non-metallic material C shall be removed from the test piece and weighed. Any non-
i
metallic material making up less than 5 % of the total non-metallic mass of the test piece shall
be assumed to have a density of 1,0 kg/dm³.
Where semi-conducting screens cannot be removed from the insulating material, the
components may be considered as one for the purpose of measuring their mass and density.
The volume V (litres per metre of cable) of each non-metallic material C is calculated as follows:
i i
M
i
V =
i
ρ × l
i
where
M is the mass of the component C (kg);
i i
ρ is the density of the component C (kg/dm³);
i i
l is the length of the test piece of cable (m).
The total volume, V, of the non-metallic materials contained in 1 m of cable is equal to the sum
of the individual volumes V , V , etc.
1 2
The closest integer (0,5 and above corresponding to 1) of the number of test pieces to be
mounted is obtained by dividing the volume per metre specified in 5.1 by the total volume, V, of
non-metallic material per metre of cable.
5.3 Mounting of the test sample
5.3.1 Cables having at least one conductor above 35 mm²
For cables having at least one conductor with a cross-section exceeding 35 mm², each test
piece shall be attached individually to each rung of the ladder by means of metal wire (steel or
copper). For cables up to and including 50 mm diameter, use wire between 0,5 mm and
1,0 mm in diameter. For cables above 50 mm diameter, use wire between 1,0 mm and 1,5 mm
in diameter.
Test pieces shall be attached to the front of the ladder in a single layer with a space between
each test piece of 0,5 times the cable diameter but not exceeding 20 mm. The ladder may be
either standard or wide depending on whichever is necessary to ensure that there shall be a
minimum distance of 50 mm between the edge of the test sample and the inside of the ladder
uprights.
The maximum width of the test sample for the standard ladder shall be 300 mm and for the
wide ladder 600 mm (see figures 1 and 2).
When mounting the test pieces, the first test piece shall be positioned approximately in the
centre of the ladder and further test pieces added on either side so that the whole array of test
pieces is approximately centred on the ladder.
60332-3-22 © IEC:2000+A1:2008 – 9 –
5.3.2 Cables having conductors 35 mm and below and optical cables
For cables having all conductors with cross-sections of 35 mm or smaller and optical cables,
each test piece shall be attached, either individually or as part of an array, to each rung of the
ladder by means of metal wire (steel or copper) between 0,5 mm and 1,0 mm in diameter.
Test pieces shall be attached to the front of the standard ladder in touching formation in one or
more layers up to a maximum total width of 300 mm. There shall be a minimum distance of
50 mm between the edge of the test sample and the inside of the ladder uprights.
When mounting the test pieces, the first test piece or array of test pieces shall be positioned
approximately in the centre of the ladder and further test pieces or arrays added on either side
so that the test sample is approximately centred on the ladder.
If a second (or more) layer of test pieces is required after the full width of the ladder has been
utilized for the first (or following) layer, then the first test piece or array of test pieces in the
second (or following) layer shall be positioned approximately in the centre of the ladder and
further test pieces or arrays added on either side so that the second (or following) layer is
approximately centred on the ladder.
If a large number of test pieces is required to make up a test sample, the test pieces may be
attached to each rung of the ladder in flat arrays of cables of a maximum width of five test
pieces using the specified metal wire. For consistency, it is recommended that adjacent arrays
of cables are secured together at every rung to ensure that they are in touching formation (see
figure 3).
5.4 Flame application time
The test flame shall be applied for 40 min, after which it shall be extinguished. The air flow rate
through the test chamber shall be maintained until cable burning or glowing has ceased, or
until a maximum duration of 1 h, after which any remaining cable burning or glowing shall be
extinguished.
6 Evaluation of test results
After all cable burning or glowing has ceased or been extinguished, the test sample shall be
wiped clean.
All soot is to be ignored if, when wiped off, the original surface is undamaged. Softening or any
deformation of the non-metallic material is also to be ignored. The flame spread shall be
measured as the extent of the damage. It shall be measured in metres to two decimal places
from the bottom edge of the burner to the onset of char. The onset of char is determined as
follows:
press against the cable surface with a sharp object, for example a knife blade. Where the
surface changes from a resilient to a brittle (crumbling) surface, this indicates the onset
of char.
– 10 – 60332-3-22 © IEC:2000+A1:2008
7 Performance requirements
The performance requirements for a particular type or class of wire or cable should preferably
be given in the individual cable standard. In the absence of any given requirement, the
recommended performance requirements given in annex B should be used.
8 Retest procedure
In case of a disputed failure, two further tests shall be undertaken as detailed in clause 5. The
test shall be deemed as satisfactory if both tests meet the stated requirement.
9 Test report
The test report shall include the following information:
a) full description of the cable tested;
b) manufacturer of the cable tested;
c) the part of the standard against which the test was carried out;
d) the number of test pieces;
e) the total volume of non-metallic material, per metre of test sample, of the test pieces;
f) the method of mounting (i.e. spaced or touching);
g) the number of layers and number of test pieces in each layer;
h) flame application time (i.e. 40 min);
i) the number of burners (i.e. one or two);
j) the extent of damage;
k) the time to extinction of all burning or glowing.
60332-3-22 © IEC:2000+A1:2008 – 11 –
300 max.
IEC 1860/2000
Key
1 Spacing distance
Dimensions in millimetres
Figure 1 – Spaced cables mounted on the front side of the standard ladder
600 max.
IEC 1861/2000
Key
1 Spacing distance
Dimensions in millimetres
Figure 2 – Spaced cables mounted on the front side of the wide ladder
– 12 – 60332-3-22 © IEC:2000+A1:2008
300 max.
IEC 1862/2000
Key
1 Centre line of ladder
Dimensions in millimetres
Figure 3 – Touching cables mounted on front side of the standard ladder
(arrays of cables in contact)
60332-3-22 © IEC:2000+A1:2008 – 13 –
Annex A
(normative)
Guidance on cable selection for type approval testing
The choice of cable type and conductor cross-section for type approval testing shall be as
given in the cable specification, or as agreed between purchaser and manufacturer.
The limited capacity of the ladders requires consideration of the conductor cross-section
selected for testing to ensure that the volume of non-metallic material can be accommodated
within the prescribed method of mounting. Therefore, the selection of cables for this part of
IEC 60332 shall comply with the following:
• only the front face of the ladder shall be used;
• for cables having a conductor cross-section greater than 35 mm², there shall not be more
cables than the number necessary to form a single layer of 600 mm width, allowing for a
space between each cable equal to half the cable diameter but not exceeding 20 mm;
• for cables having a conductor cross-section of 35 mm or smaller and optical cables, there
is no restriction on cable selection;
• the minimum number of test pieces shall be two.
A summary of all conditions for type approval testing to this part of IEC 60332 is given in
table A.1.
Table A.1 – Summary of test conditions
Category and designation A
a
b
Range of conductor cross-sections (mm²) > 35
≤35
Non-metallic volume per metre of test sample (l) 7 7
Use of standard ladder, maximum width of test sample:
300 mm
– number of layers:
...
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