IEC_60332_3_10_2000_pcZ5ZZq.pdf

NORMECEIINTERNATIONALEIECINTERNATIONAL60332-3-10STANDARDPremiere editionFirst edition2000-10PUBLICATION GROUPEE DE SECURITEGROUP SAFETY PUBLICATIONEssais des cables electriques soumis au feu-Partie 3-10:Essai de propagation verticale de la flamme desfils ou cables en nappes en position verticale-AppareillageTests on electric cables under fire conditions-Part 3-10:Test for vertical flame spread of vertically-mountedbunched wires or cables-Apparatus IEC 2000 Droits de reproduction reservs-Copyright-al rights reservedAucune partie de cette publication ne peut tre reproduite ni No part of this publication may be reproduced or utlized inutilise sous quelque forme que ce soit et par aucun procd.any form or by any means,electronic or mechanical.lectronique ou mcanique.y compris la photocopie et les including photocopying and microfilm.without permission inmicroilms.sans laccord ecrit de lediteurwriting from the publisherIntemational Electrotechnical Commission3,rue de Varembe Geneva,SwitzerlandTelefax:+41 22 919 0300e-mail:inmailiec.chIEC web site http:/www.iec.chCommission Electrotechnique InternationaleCODE PRIXPRICE CODERIECInternational Electrotechnical CommissionMemAyHapoAHaR neTpoTexHHecHaR HOMHCCHRPour prix voir catalogue en vigueurFor price.see current catalogue60332-3-10IEC:2000-3-CONTENTSPageFOREWORD.A5INTRODUCTION9Clause1 Scope.112 Normative references113 Definitions114 Test environment115 Test apparatus135.1 Test chamber135.2Air supply135.3 Ladder types.135.4 Effluent cleaning attachment136 Ignition source156.1 Type.156.2 Positioning17Annex A(informative)Details of recommended burner.33Annex B(informative)Flowmeter calibration correction factors.35Figure 1-Test chamber.19Figure 2-Thermal insulation of back and sides of the test chamber.21Figure 3-Positioning of burner and typical arrangement of test sample on lade.23Figure 4-Tubular steel ladders for cable test.25Figure 5-Burner configurations.27Figure 6-Arrangement of holes for burners.29Figure 7-Example of schematic diagram of burner control systems.3160332-3-10IEC:2000-5-INTERNATIONAL ELECTROTECHNICAL COMMISSIONTESTS ON ELECTRIC CABLES UNDER FIRE CONDITIONS-Part 3-10:Test for vertical flame spread of vertically-mountedbunched wires or cables-ApparatusFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the International Organizationfor Standardization(ISO)in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express,as nearly as possible,aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards,technical specifications,technical reports or guides and they are accepted by the NationalCommittees in that sense4)In order to promote international unification,IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards.Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights.The IEC shall not be held responsible for identifying any or all such patent rightsInternational Standard IEC 60332-3-10 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 60332-3-10 forms one of a series of publications dealing with tests on electric cables underfire conditions;the series supersedes IEC 60332-3 published in 1992.The parts of the seriesare described in the introduction.All pre-existing categories of test are retained and updated.A new category(category D)hasbeen added to cater for testing at very low non-metallic volumes.The text of this standard is based on the following documents:FDISReport on voting20/402/FDIS20/426/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives,Part 3.60332-3-101EC:2000-7-Annexes A and B are for information onlyThe committee has decided that the contents of this publication will remain unchanged until2008.At this date,the publication will be。reconfirmed;。withdrawn;replaced by a revised edition,or。amended60332-3-101EC:20009INTRODUCTIONParts 1 and 2 of IEC 60332 specify methods of test for flame spread characteristics for a singlevertical insulated wire or cable.It cannot be assumed that,because a wire or cable meets therequirements of parts 1 and 2,a vertical bunch of similar cables or wires will behave in asimilar manner.This is because flame spread along a vertical bunch of cables depends on anumber of features,such asa)the volume of combustible material exposed to the fire and to any flame which may beproduced 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-coreAll of the foregoing assume that the cables are able to be ignited when involved in an externalfire.Part 3 of IEC 60332 gives details of a test where a number of cables are bunched together toform various test sample installations.For easier use and differentiation of various testcategories,the parts are designated as follows:Part 3-10:ApparatusPart 3-21:Category A F/RPart 3-22:Category APart 3-23:Category BPart 3-24:Category CPart 3-25:Category DParts from 3-21 onwards define the various categories and the relevant procedures.Thecategories are distinguished by test duration,the volume of non-metallic material of the testsample and the method of mounting the sample for the test.In all categories,cables having atleast one conductor of cross-sectional area greater than 35 mm are tested in a spacedconfiguration,whereas cables of conductor cross-sectional area of 35 mm or smaller aretested 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 offlame spread occurring in an actual fire.The method of mounting described in category A F/R(part 3-21)is intended for special cabledesigns used in particular installationsCategories A,B,C and D(parts 3-22 to 3-25 respectively)are for general use where differentnon-metallic volumes are applicable.Additional categories,especially to cover the use of small diameter communication cables inclosely bunched configurations,will be further considered when more data are available.