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1、a Date: 31 October 2006 Origin: National Latest date for receipt of comments: 31 January 2007 Project no.: 2006/01778 Responsible committee: GEL/20/18 Fire testing Interested committees: FSH/25, FSH/25/3 Title: Draft BS BS 8491 Fire integrity of power cables - Test method Supersession information: I
2、f this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede NONE . If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR
3、USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 January 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copyin
4、g is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organizatio
5、n by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. British Standards on CD or Online are available from British Sta
6、ndards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement Internati
7、onal or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-. Direct tel: 0208 996 7281 Responsible Committee Secretary: Mr S Bounds (BSI) E-mail: simon.boundsbsi- Draft for Public Comment Head Office 389 Chiswick Hi
8、gh Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 6.1 DPC: 06/30152609 DC Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI b Introduction Your comments on this draft are
9、 welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, this draft may be implemented unchanged as a British Standard. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate at
10、tention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97
11、of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting
12、comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at:http:/www.bsi- Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figu
13、re/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connecti
14、on . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed
15、Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft. 2006-01778dpc 1 Method for assessment of fire integrity of large diameter power cables for use as components for smoke and heat control systems and certain
16、other active fire safety systems Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft. 2006-01778dpc 2 Foreword Publishing information This British Standard was published by BSI and came into effect on
17、 . It was prepared by Subcommittee GEL/20/18, Fire testing, under the authority of Technical Committee GEL/20, Electric cables. Relationship with other publications The test method given in this British Standard is technically identical with the test method given in BS 7346-6:2005, Annex B. It is in
18、tended that when BS 7346-6:2005 is amended Annex B will be taken out. Information about this document The test method given in this British Standard includes subjecting the cable under test to radiation via direct impingement corresponding to a constant temperature attack of 842 C, to direct mechani
19、cal impacts corresponding to a force of approximately 10 N, and to direct application of a water jet simulating a water fire fighting jet. NOTE 1 Although this test method has changes to accommodate the application of impacts and the water jet, it is based on the test method given in BS EN 50362, wh
20、ich has the constant temperature attack of 842 C. This is the same constant temperature attack as used in the test method given in BS EN 50200. BS 7346-6 specifies three fire survival times depending upon the application of the cables. Cables for fire fighting systems (FF) require a minimum of 120 m
21、in; cables for life safety systems (LS) require either 30 min or 60 min. The test method given in this British Standard includes three different test durations to allow testing of cables intended for these different applications. It is emphasized that fire tests do not assess a fire hazard, nor can
22、the results of fire tests alone guarantee safety. They only provide information to assist in the assessment of the suitability of a cable for a given application. Hazard warnings WARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adequ
23、ate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. The test given in this British Standard may involve the use of dangerous voltages and temperatures. Suitable precautions should be t
24、aken against the risk of shock, burning, fire and explosion that may be involved and against any noxious fumes that may be produced. Use of this document It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified
25、and experienced people, for whose use it has been produced. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft. 2006-01778dpc 3 Presentational conventions The provisions of this standard are presente
26、d in roman (i.e. upright) type. Its methods are expressed as a set of instructions, a description, or in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative eleme
27、nt. Contractual and legal considerations 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 cannot confer immunity from legal obligations. Licensed Copy: London South Bank Univ
28、ersity, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft. 2006-01778dpc 4 1 Scope This British Standard describes a method for assessment of the fire integrity of large diameter power cables for use as components for smoke and heat control sy
29、stems as given in BS 7346-6, and certain other active fire safety systems. It is applicable to cables of rated voltage not exceeding 600/1 000 V and of overall diameter greater than 20 mm. 2 Normative references The following referenced documents are indispensable for the application of this documen
30、t. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS EN 60529, Specification for degrees of protection provided by enclosures (IP code) BS EN 60584-1, Thermocouples Part 1: Reference tabl
31、es BS EN 60695-4, Fire hazard testing Terminology concerning fire tests BS EN ISO 13943, Fire safety Vocabulary IEC 60269-3-1:2004, Low-voltage fuses Part 3-1: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications) Sections I to IV: Ex
32、amples of types of standardized fuses 3 Terms and definitions For the purposes of this British Standard the terms and definitions given in BS EN ISO 13943 and BS EN 60695-4 apply. 4 Test chamber WARNING. The test method given in this British Standard may involve the use of dangerous voltages and tem
33、peratures. Suitable precautions should be taken against the risks of shock, burning, fire and explosion that may be involved, and against any noxious fumes that may be produced. The test shall be carried out in a suitable chamber of minimum volume 10 m3, with facilities for disposing of any noxious
34、gases resulting from burning. Sufficient ventilation shall be available to sustain the burner flame (see 5.3) for the duration of the test. The locations of any air inlets and exhaust chimney shall be such that the burner flame remains stable during the verification procedure and during the tests. T
35、he same ventilation and shielding conditions shall be used in the chamber during both the verification and the test procedures. NOTE Guidance on the choice of suitable chambers and on ventilation and shielding conditions is given in Annex A. The atmosphere in the chamber shall be between 10 C and 40
36、 C at the start of each test. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft. 2006-01778dpc 5 5 Apparatus NOTE The arrangement of the apparatus is shown in Figure 1, Figure 2 and Figure 3. 5.1 Te
37、st ladder, for mounting the test specimen, comprising a steel framework as shown in Figure 1. The two central vertical elements of the ladder shall be adjustable in order to accommodate test specimens of different sizes of cable. The test ladder shall be (1 200 100) mm long and (600 50) mm high, and
38、 the total mass of the test ladder shall be (18 1) kg. Ballast, if required, shall be placed on the test ladder. NOTE 1 Angle iron, (45 5) mm wide and (6 1) mm thick with slots cut to allow for movement of the vertical elements and the fixing of the bolts and clips (see 7.2), has been found to be a
39、suitable material for construction of the test ladder. The test ladder shall be fastened to a rigid support framework by four bonded rubber bushes of hardness 50 to 60 Shore A. To enable this to be done, each horizontal element of the test ladder shall be extended beyond the end vertical elements an
40、d shall have a mounting hole not more than 200 mm from each end vertical element, the exact position and diameter being determined by the particular bushes and supporting framework used. The bushes shall be fitted between the horizontal elements of the ladder and the support framework, as illustrate
41、d in Figure 1 and Figure 2 so as to allow movement of the test ladder under impact. NOTE 2 A typical rubber bush is illustrated in Figure 4 5.2 Circuit continuity checking and voltage withstand arrangement, comprising a three- phase star-connected transformer, or one or more single-phase transformer
42、s, of sufficient capacity to maintain the test voltage, up to the maximum leakage current allowable, together with a suitable load and an indicating device (e.g. a lamp). NOTE 1 Consideration should be given to the characteristics of the fuse or circuit breaker (see 5.9) when selecting the power rat
43、ing of the transformer. NOTE 2 A lamp would constitute both a load and an indicating device. If a load other than a lamp is used a separate indicating device would be needed, such as a bell or a buzzer. 5.3 Source of heat, comprising a horizontally mounted ribbon type propane gas burner with a ventu
44、ri mixer. The burner face length shall be 500 mm and the burner face width shall be 10 mm. The face of the burner shall have three staggered rows of holes 1.32 mm in diameter drilled at 3.2 mm centres, as shown in Figure 5. NOTE 1 A centre feed burner is recommended. NOTE 2 In addition to the three
45、rows of holes specified, a row of small holes milled on each side of the burner face is permitted, to serve as pilot holes for keeping the flame burning. The flow rates of propane gas and of air to the burner shall be monitored by flow meters. Mass flow meters should be used as a means of controllin
46、g accurately the input flow rates. Rotameter type flow meters may be used as an alternative but are not recommended. If rotameter type flow meters are used, correction factors shall be applied to the readings to take account of the temperature and pressure of the propane gas and the air supply. NOTE
47、 3 Guidance on the use of rotameter type flow meters, and the application of appropriate correction factors, is given in BS EN 50200:2006, Annex B. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:07:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8491 Draft.
48、 2006-01778dpc 6 The volume flow rate of propane gas to the burner shall be (10 0.4) l/min, which is equivalent to a mass flow rate of (319 13) mg/s. The volume flow rate of air to the burner shall be (160 8) l/min, which is equivalent to a mass flow of (3 267 163) mg/s. NOTE 4 The mass flow rates g
49、iven above have been calculated from the specified volume flow rates at reference conditions of 100 kPa (= 1 bar) and 20 C. NOTE 5 The purity of the propane gas is not specified. Use of an industrial grade of propane gas that contains impurities is permitted provided that the burner meets the performance requirements specified in 6.4. The performance of the burner and associated controls shall be verified using the procedure given in C