1、BRITISH STANDARD BS EN 50266-1:2001 Common test methods for cables under fire conditions Test for vertical flame spread of vertically-mounted bunched wires or cables Part 1: Apparatus The European Standard EN 50266-1:2001 has the status of a British Standard ICS 13.220.40; 29.060.20 NO COPYING WITHO
2、UT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS - - -BS EN 50266-1:2001 This British Standard, having been prepared under the directio
3、n of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 08-2001 ISBN 0 580 37915 9 National foreword This British Standard is the official English language version of EN 50266-1:2001. Together with BS EN 502
4、66-2-1, BS EN 50266-2-2, BS EN 50266-2-3; BS EN 50266-2-4 and BS EN 50266-2-5, it supersedes BS 4066-3:1994 which is withdrawn.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, and can be found in the respective parts of the new publication as f
5、ollows: 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 this subcommittee can be obtained on request to its secretary. Cross-
6、references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic
7、Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Test category in BS 4066-3 Equ
8、ivalent 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 This part describes Category D, which did not form pa
9、rt 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 developments and promulgate them in the UK. Summary of pag
10、es This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Copyright British Standards In
11、stitution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS EUROPEAN STANDARD EN 50266-1 NORME EUROPENNE EUROPISCHE NORM February 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation E
12、lectrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50266-1:2001 E ICS 13.220.40; 29.020; 29.060.20 Super
13、sedes HD 405.3 S1:1993 English version Common test methods for cables under fire conditions - Test for vertical flame spread of vertically-mounted bunched wires or cables Part 1: Apparatus Mthodes dessai communes aux cbles soumis au feu - Essai de propagation verticale de la flamme des fils ou cbles
14、 en nappes en position verticale Partie 1: Appareillage Allgemeine Prfverfahren fr Kabel und isolierte Leitungen im Brandfall - Prfung der senkrechten Flammenausbreitung von senkrecht angeordneten Bndeln von Kabeln und isolierten Leitungen Teil 1: Prfvorrichtung This European Standard was approved b
15、y CENELEC on 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 s
16、tandards may 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
17、notified to the 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, Sw
18、eden, Switzerland and United Kingdom. Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS EN 50266-1:2001 - 2 - Foreword This European Standard was prepared by Working Group 10 of the Technical
19、 Committee CENELEC TC 20, Electric cables. When used in conjunction with the relevant parts 2 of EN 50266 this European Standard supersedes HD 405.3 S1. The description of the apparatus given in this part 1 updates that in HD 405.3 S1. All pre-existing categories of test from HD 405.3 S1 have been r
20、etained and updated in the different parts 2. A new category (category D) has been added to cater for testing at very low non-metallic volumes. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50266-1 on 2000-08-01. The following dates were fix
21、ed: latest date by which the EN has to be implemented at national level by publication 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 informative are giv
22、en for information only. In this standard, annexes A and B are informative. _ Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS - - - 3 - EN 50266-1:2001 Contents Page Introduction . 4 1 Scop
23、e. 5 2 Normative references. 5 3 Definition 5 3.1 Ignition source . 5 4 Test environment . 5 5 Test apparatus . 5 5.1 Test chamber. 5 5.2 Air supply . 6 5.3 Ladder types 6 5.4 Effluent cleaning attachment . 6 6 Ignition source 6 6.1 Type. 6 6.2 Positioning . 7 Annex A (informative) Details of recomm
24、ended burner 15 Annex B (informative) Flowmeter calibration correction factors . 16 Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS EN 50266-1:2001 - 4 - Introduction Methods of test for fl
25、ame spread characteristics for a single vertical insulated wire or cable are given in 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 al
26、ong 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 tem
27、perature 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, e.g. armoured or unarmoured, multi or
28、 single core. All of the foregoing assume that the cables are able to be ignited when 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 a
29、pparatus and the various test categories, the parts are designated as follows: Part 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
30、 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 condu
31、ctor cross-sectional area of 35 mm 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 occurrin
32、g in an actual fire. The method of mounting described as category A F/R (part 2-1) is 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 cate
33、gories, especially to cover the use of small diameter communication cables in closely bunched configurations, will be further considered when more data is available. Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted
34、without license from IHS - - - 5 - EN 50266-1:2001 1 Scope 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 c
35、able“ covers all insulated metallic conductor cables used for the conveyance of energy or signals. This part 1 details the apparatus and its arrangement and calibration. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. Thes
36、e 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 publications apply to this European Standard only when incorporated in it by amendment or revision. For undate
37、d references the latest edition of the publication referred to applies. EN 60695-4 Fire hazard testing - Part 4: Terminology concerning fire tests. 3 Definition For the purpose of EN 50266-1 the following definition applies. Definitions are taken from EN 60695-4. 3.1 ignition source a source of ener
38、gy that initiates combustion 4 Test environment The test shall not be carried out if the external wind speed measured by an anemometer fitted on the top of the test rig is greater than 8 m/s and shall not be carried out if the temperature of the inside walls is below 5 C or above 40 C measured at a
39、point approximately 1 500 mm above floor level, 50 mm from a side wall, and 1 000 mm from the door. The enclosure door shall be closed throughout the test. 5 Test apparatus The test apparatus consists of the following: 5.1 Test chamber The test rig (Figure 1) shall comprise a vertical test chamber h
40、aving a width of (1 000 100) mm, a depth of (2 000 100) mm and a height of (4 000 100) mm; the floor of the chamber shall be raised above ground level. The test chamber shall be nominally airtight along its sides, air being admitted at the base of the test chamber through an aperture of (800 20) mm
41、x (400 10) mm situated (150 10) mm from the front wall of the test chamber (see Figure 1). An outlet (300 30) mm x (1 000 100) mm shall be made at the rear edge of the top of the test chamber. The back and sides of the test chamber shall be thermally insulated to give a coefficient of heat transfer
42、of approximately 0,7 W.m -2 .K -1 . For example, a steel plate 1,5 mm to 2,0 mm thick covered with 65 mm of mineral wool with a suitable external cladding is satisfactory (see Figure 2). The distance between the ladder and the rear wall of the chamber is (150 10) mm, and between the bottom rung of t
43、he ladder and the floor (400 5) mm. The clearance between the lowest point of the test piece and the floor is approximately 100 mm (see Figure 3). Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license fro
44、m IHS - - -EN 50266-1:2001 - 6 - 5.2 Air supply A means of supplying a controlled air flow through the chamber shall be fitted. NOTE 1 It is recommended that the air should be blown into the test chamber, via the air inlet, using a suitable fan. Prior to burner ignition, the air flow shall be adjust
45、ed to a rate of (5 000 500) litre/min at a constant controlled temperature of (20 10)C and at atmospheric pressure and measured at the inlet side before the test commences. This air flow shall be maintained throughout the test until cable burning or glowing has ceased or for a maximum time of one ho
46、ur from completion of the test flame application period, after which period the flame or glowing shall be extinguished. NOTE 2 In order to remove noxious gases it is recommended to maintain the air flow for some minutes after the end of test, before entering the test chamber. 5.3 Ladder types There
47、are two types of tubular steel ladder: a standard ladder of (500 5) mm width and a wide ladder of (800 10) mm width. Details of the types of ladder are given in Figures 4a and 4b. 5.4 Effluent cleaning attachment Legal requirements may make it necessary for equipment for collecting and washing the e
48、ffluent to be fitted to the test chamber. This equipment shall not cause a change in the air flow rate through the test chamber. 6 Ignition source 6.1 Type As required by the test procedure the ignition source shall be one or two ribbon-type propane gas burners complete with venturi mixer, and their
49、 own set of flow meters. The propane gas shall be technical grade propane of nominal 95 % purity. The flame-producing surface of the burner(s) shall consist of a flat metal plate through which 242 holes of 1,32 mm in diameter are drilled on 3,2 mm centres in three staggered rows of 81, 80 and 81 holes each to form an array having the nominal dimensions 257 mm x 4,5 mm. As the burner plate may be drilled without
