1、BRITISH STANDARD BS EN 50266-2-5:2001 Incorporating Corrigendum No. 1 Common test methods for cables under fire conditions Test for vertical flame spread of vertically-mounted bunched wires or cables Part 2-5: Procedures Small cables Category D The European Standard EN 50266-2-5:2001 has the status
2、of a British Standard ICS 13.220.40; 29.060.20 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - -BS EN 50266-2-5:2001 This British Standard, having been prepa
3、red under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 30 September 2002 ISBN 0 580 38034 3 National foreword This British Standard is the official English language version of EN 50266
4、-2-5:2001, including Corrigendum March 2002. Together with BS EN 50266-1, BS EN 50266-2-1, BS EN 50266-2-2; BS EN 50266-2-3 and BS EN 50266-2-4, it supersedes BS 4066-3:1994 which is withdrawn. BS 4066-3: 1994 had a number of test categories. All these test categories are retained in BS EN 50266, an
5、d can be found in the respective parts of the new publication as follows: The UK participation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/3, Insulation and sheath, which has the responsibility to: A list of organizations represented on thi
6、s subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by us
7、ing the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity
8、from legal obligations. Test category in BS 4066-3 Equivalent part of BS EN 50266 a A F/R BS EN 50266-2-1 A BS EN 50266-2-2 B BS EN 50266-2-3 C BS EN 50266-2-4 BS EN 50266-2-5 b a In all cases, the particular part is to be used in conjunction with BS EN 50266-1, which describes the test apparatus. b
9、 This part describes Category D, which did not form part of BS 4066-3. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European deve
10、lopments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, and inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments i
11、ssued since publication Amd. No. Date Comments 13850 Corrigendum No. 1 30 September 2002 Change to date of withdrawal in EN foreword Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted wit
12、hout license from IHS EUROPEAN STANDARD EN 50266-2-5 NORME EUROPENNE EUROPISCHE NORM February 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35,
13、 B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50266-2-5:2001 E ICS 13.220.40; 29.020; 29.060.20 Incorporating corrigendum March 2002 English version Common test methods for cables under fire conditions -
14、Test for vertical flame spread of vertically-mounted bunched wires or cables Part 2-5 Procedures - Small cables - Category D Mthodes dessai communes aux cbles soumis au feu - Essai de propagation verticale de la flamme des fils ou cbles en nappes en position verticale Partie 2-5: Procdures - Petits
15、cbles - Catgorie D Allgemeine Prfverfahren fr Kabel und isolierte Leitungen im Brandfall - Prfung der senkrechten Flammenausbreitung von senkrecht angeordneten Bndeln von Kabeln und isolierten Leitungen Teil 2-5: Prfverfahren - Dnne Kabel - Prfart D This European Standard was approved by CENELEC on
16、2000-08-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may
17、be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to t
18、he Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
19、land and United Kingdom. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - -EN 50266-2-5:2001 - 2 - Foreword This European Standard was prepared by Working Gro
20、up 10 of the Technical Committee CENELEC TC 20, Electric cables. All pre-existing categories of test from HD 405.3 S1 have been retained and updated in different parts 2. This part 2-5 introduces a new category (Category D) to cater for testing at very low non-metallic volumes. The description of th
21、e apparatus given in EN 50266-1 updates that in HD 405.3 S1. The text of the draft was submitted to the Unique Acceptance procedure and was approved by CENELEC as EN 50266-2-5 on 2000-08-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publ
22、ication of an identical national standard or by endorsement (dop) 2001-08-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2002-08-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given for inf
23、ormation only. In this standard, annex A is normative and annex B is informative. _ Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - - 3 - EN 50266-2-5:2001 C
24、ontents Page Introduction4 1 Scope5 2 Normative references .5 3 Definitions .5 3.1 Ignition source 5 3.2 Char5 3.3 Flame spread .5 4 Test apparatus6 4.1 General.6 4.2 Ignition source 6 5 Test procedure .6 5.1 Test sample6 5.2 Determination of number of test pieces .6 5.3 Mounting of the test sample
25、.7 5.4 Flame application time .7 6 Evaluation of test results.7 7 Performance requirements.7 8 Retest procedure 7 9 Test report 8 Annex A (normative) Guidance on cable selection for type approval testing 9 Annex B (informative) Recommended performance requirements.10 Copyright European Committee for
26、 Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS EN 50266-2-5:2001 - 4 - Introduction Methods of test for flame spread characteristics for a single vertical insulated wire or cable are given i
27、n EN 50265, but it cannot be assumed that, because a cable or wire meets the requirements of that standard, 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 volu
28、me 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
29、 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, e.g. armoured or unarmoured, multi or single core. All of the foregoing assume that the cables are able to be ignited whe
30、n involved in an external fire. EN 50266 gives details, in various parts, of a test where a number of cables are bunched together to form various test sample installations. For easier use and differentiation of the apparatus and the various test categories, the parts are designated as follows: Part
31、1 Apparatus Part 2-1 Category A F/R Part 2-2 Category A Part 2-3 Category B Part 2-4 Category C Part 2-5 Category D Parts from 2-1 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 sam
32、ple 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 configuration
33、. 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 2-1) i
34、s intended for special cable designs used in particular installations. Categories A, B, C and D (parts 2-2 to 2-5 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 closel
35、y bunched configurations, will be further considered when more data is available. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - - 5 - EN 50266-2-5:2001 1 S
36、cope EN 50266 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 use
37、d 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 cables abi
38、lity to limit flame spread. This Part 2-5 covers Category D and relates only to small cables of overall diameter 12 mm or smaller installed on the test ladder to achieve a nominal total volume of non-metallic material of 0,5 litres per metre of test sample. The flame application time is 20 min. The
39、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 performance requirement is given in annex B. 2 Normative references This
40、 European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publica
41、tions apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 50266-1 Common test methods for cables under fire conditions - Test for vertical flame spread of vertically-mounted bunche
42、d wires or cables - Part 1 : Apparatus EN 60695-4 Fire hazard testing - Part 4: Terminology concerning fire tests EN 60811-1-3 Insulating and sheathing materials of electric cables - Common test methods Part 1- 3: General application - Methods for determining the density - Water absorption tests - S
43、hrinkage test 3 Definitions For the purpose of this EN 50266-2-5, the following definitions apply. Definitions are taken from EN 60695-4. 3.1 ignition source a source of energy that initiates combustion 3.2 char carbonaceous residue resulting from pyrolysis or incomplete combustion 3.3 flame spread
44、propagation of a flame front Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - -EN 50266-2-5:2001 - 6 - 4 Test apparatus 4.1 General The apparatus specified in
45、 EN 50266-1 shall be used. 4.2 Ignition source The ignition source shall be one ribbon-type propane gas burner as specified in EN 50266-1. 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
46、 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 litres per metre of test sample. The test sample shall be chosen within the limitations given in annex A. The test pieces forming the test sample
47、 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-metalli
48、c material of one test piece. A length of cable which shall not be 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. The density of each non-metallic component (including cellular material) shall
49、 be measured in an appropriate way, e.g. clause 8 of EN 60811-1-3, in order to obtain values expressed to the second decimal place. Each non-metallic material C ishall be removed from the test piece and weighed. Any non-metallic material making up less than 5 % of the total non-metallic mass of the test piece shall be assumed to have a densit
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