SANS 60332-3-25-2009 Tests on electric and optical fibre cables under fire conditions Part 3-25 Test for vertical flame spread of vertically-mounted bunched wires or cables - Categ.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22810-1 SANS 60332-3-25:2009Edition 1.1 and nat. amdt 1IEC 60332-3-25:2009Edition 1.1SOUTH AFRICAN NATIONAL STANDARD Tests on electric and

4、 optical fibre cables under fire conditons Amdt 1 Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables Category D This national standard is the identical implementation of IEC 60332-3-25:2009 and is adopted with the permission of the International Electrotechnical

5、Commission. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 60332-3-25:2009 Edition 1.1 and nat. amdt 1 IEC 60332-3-25:2009 Edition 1.1 Table of changes Change No. Date Scope Nat. amdt

6、1 2007 Amended to change the designation from SABS to SANS, with no technical changes. IEC amdt 1 2008 Amended to include optical fibre cables in the standard, and to specify a precondition in the retest procedure. National foreword This South African standard was approved by National Committee SABS

7、 TC 66, Electric cables, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was approved in May 2009. This SANS document supersedes SANS 60332-3-25:2000 (edition 1 as modified by nat. amdt 1:2007). IEC 60332-3-25Editi

8、on 1.1 2009-02INTERNATIONAL STANDARD NORME INTERNATIONALETests on electric and optical fibre cables under fire conditions Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables Category D Essais des cbles lectriques et des cbles fibres optiques soumis au feu Partie 3

9、-25: Essai de propagation verticale de la flamme des fils ou cbles monts en nappes en position verticale Catgorie D INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE CBICS 29.060.20;13.220.40; 29.020 PRICE CODECODE PRIXISBN 2-8318-1029-7GROUP SAFETY PUBLICATION PUB

10、LICATION GROUPE DE SCURIT Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale SANS 60332-3-25:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 2 60332-3-25 IE

11、C:2000+A1:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references6 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

12、 time.9 6 Evaluation of test results.9 7 Performance requirements9 8 Retest procedure 9 9 Test report9 Annex A (normative) Guidance on cable selection for type approval testing.11 Annex B (informative) Recommended performance requirements .12 Figure 1 Touching cables mounted on the front side of the

13、 standard ladder (arrays of cables in contact) 10 Table A.1 Summary of test conditions.11 SANS 60332-3-25:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60332-3-25 IEC:2000+A1:2008 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TESTS ON E

14、LECTRIC AND OPTICAL FIBRE CABLES UNDER FIRE CONDITIONS Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables Category D FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotec

15、hnical 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 Specification

16、s, 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, g

17、overnmental 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 decisio

18、ns 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 internat

19、ional 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

20、 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 clear

21、ly 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

22、 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

23、 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 publi

24、cation. 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 60332-3-25 has been prepared by IEC technical committee

25、20: Electric cables. It has the status of a group safety publication in accordance with IEC Guide 104. IEC 60332-3-25 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 de

26、scribed 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. SANS 60332-3-25:2009This s tandard may only be used and printed by approved subscription and freemailing client

27、s of the SABS . 4 60332-3-25 IEC:2000+A1:2008 This consolidated version of IEC 60332-3-25 consists of the first edition (2000) documents 20/407/FDIS and 20/431/RVD and its amendment 1 (2008) documents 20/937/CDV and 20/986A/RVC. The technical content is therefore identical to the base edition and it

28、s 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 t

29、he 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 revi

30、sed edition, or amended. SANS 60332-3-25:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60332-3-25 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

31、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)

32、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

33、; 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 t

34、o 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: Appa

35、ratus 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 tes

36、t 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 are tested in a touching configur

37、ation. 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

38、-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. SANS 60332-3-25:2009This s tandard may only be used and printed by approved subscription an

39、d freemailing clients of the SABS . 6 60332-3-25 IEC:2000+A1:2008 TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES UNDER FIRE CONDITIONS Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables Category D 1 Scope The series of International standards covered by Parts 3-10, 3

40、-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 insula

41、ted 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 u

42、sed to demonstrate the cables ability to limit flame spread. This part of IEC 60332 covers category D and relates only to small cables of overall diameter 12 mm or smaller and cross-section of 35 mm2or smaller installed on the test ladder to achieve a nominal total volume of non-metallic material of

43、 0,5 l/m of test sample. The flame application time is 20 min. The method of mounting uses the front of the standard ladder in touching formation only. The category is intended for use with small cables where very low volumes of non-metallic material are required to be evaluated. A recommended perfo

44、rmance 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 amendme

45、nts) 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

46、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 SANS 60332-3-25:2009Thi

47、s s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60332-3-25 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 ener

48、gy 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 ribbon

49、-type propane gas burner as specified in IEC 60332-3-10. 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 0,5 l/m of test sample. The test sample shall be chosen within the limitations given in annex A. The test piec