BS 6387-2013 Test method for resistance to fire of cables required to maintain circui t integrity under fire conditions《在火灾情况下保持电路完好要求的电缆防火试验方法》.pdf

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1、BSI Standards PublicationBS 6387:2013Test method for resistanceto fire of cables required tomaintain circuit integrityunder fire conditionsPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institu

2、tion 2013Published by BSI Standards Limited 2013ISBN 978 0 580 81046 6ICS 13.220.99; 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/18Draft for comment 13/30273419 DCPublication historyFirst published September 1983Second edition January 1994Thir

3、d (present) edition December 2013Amendments issued since publicationDate Text affectedBS 6387:2013 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Categorization of cables 15 Test chamber 26 Protocol C for resistance to fire alone 27 Protocol W for resi

4、stance to fire with water 58 Protocol Z for resistance to fire with mechanical shock 10Bibliography 15List of figuresFigure 1 Cable supporting arrangement for test for fire resistance alone 3Figure 2 Circuit diagram 4Figure 3 Method of supporting cable for test of resistance to fire withwater 5Figur

5、e 4 Example of supporting frame for test for resistance to fire withwater 6Figure 5 End elevation of supporting frame for test for resistance to fire withwater 7Figure 6 Burner face for test 8Figure 7 Example of sprinkler head for test for resistance to fire with water 9Figure 8 Rig for test for res

6、istance to fire with mechanical shock 11Figure9Typical rubber bush for fastening board for test for resistance to firewith mechanical shock 12Figure 10 Cable mounting for test for resistance to fire with mechanicalshock 13Summary of pagesThis document comprises a front cover, an inside front cover,

7、pages i to iv,pages 1 to 16, an inside back cover and a back cover.BRITISH STANDARD BS 6387:2013 The British Standards Institution 2013 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effec

8、t on 31 December 2013. Itwas prepared by Subcommittee GEL/20/18, Fire testing, under the authority ofTechnical Committee GEL/20, Electric cables. A list of organizations representedon these committees can be obtained on request to their secretary.SupersessionThis British Standard supersedes BS 6387:

9、1994, which is withdrawn.Information about this documentThis is a full revision of the standard, which now gives only a test method forfire resistance characteristics of cables. Physical and electrical tests and theirrelevant requirements are now given in the appropriate product standards.Other test

10、 methods for the fire resistance of cables have been developed sincethe previous revision of BS 6387. These include BS 8434 and BS 8491, cateringfor specific applications, installations and end-user markets.The test method given in this British Standard consists of three componentprotocols, designat

11、ed C, W and Z. These are technically unchanged from theprevious edition. Previous editions of BS 6387 have included categories based onother protocols (A, B, S, X and Y). These are now regarded as obsolete.When separate test pieces from the same sample of cable are tested to each ofthese three proto

12、cols, these together comprise the full test. When therequirements of each one of the protocols are met, the cable may be designatedas “category CWZ”. In detail:a) Protocol C subjects the cable under test to a flame via direct impingementcorresponding to a temperature attack of 950 C 40 C.b) Protocol

13、 W subjects the cable under test to a flame via direct impingementcorresponding to a temperature attack of 650 C 40 C with directapplication of water simulating a sprinkler system.c) Protocol Z subjects the cable under test to a flame via direct impingementcorresponding to a temperature attack of 95

14、0 C 40 C with indirectapplication of mechanical shock.Product standards might refer to only one of the protocols C or W or Z in,respectively, Clauses 6, 7 or 8 but, in such cases, may not use the designation“Category CWZ”.It is emphasized that fire tests do not assess a fire hazard, nor can the resu

15、lts offire tests alone guarantee safety. They only provide information to assist in theassessment of the suitability of a cable for a given application.Hazard warningsWARNING. This British Standard calls for the use of substances and/orprocedures that can be injurious to health if adequate precautio

16、ns are nottaken. It refers only to technical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.The test methods given in this British Standard might involve the use ofdangerous voltages and temperatures. Suitable precautions should be takenaga

17、inst the risks of shock, burning, fire and explosion that might be involved,and against any noxious fumes that might be produced.BRITISH STANDARDBS 6387:2013ii The British Standards Institution 2013Use of this documentIt has been assumed in the preparation of this British Standard that theexecution

18、of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsmethods are expressed as a set of instructions, a description, or in sente

19、nces inwhich the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions

20、of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 6387:2013 The British Standards Institution 2013 iiiBRITISH STANDARDBS 6387:2013This page deliberately left blankiv The British Standard

21、s Institution 20131 ScopeThis British Standard gives a test method for resistance to fire of cables requiredto maintain circuit integrity under fire conditions. It is applicable to cables ofrated voltage not exceeding 600/1 000 V and of overall diameter less than orequal to 20 mm.The test given in t

22、his British Standard is applicable to cables having two or moreinsulated conductors, whether or not the cables incorporate other metallicelements such as armour, screen or circuit protective conductor. The test is alsoapplicable to cables having one insulated conductor provided that the cableincorpo

23、rates at least one other metallic element. The test is not applicable tocables having one insulated conductor but no other metallic element.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For da

24、ted references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS EN 60584-1, Thermocouples Part 1: Reference tables (IEC 60584-1)BS EN 60695-4, Fire hazard testing Part 4: Terminology concerning fire tests forel

25、ectrotechnical productsBS EN ISO 13943, Fire safety VocabularyIEC 60269-3:2010, Low-voltage fuses Part 3: Supplementary requirements forfuses for use by unskilled persons (fuses mainly for household and similarapplications) Examples of standardized systems of fuses A to F3 Terms and definitionsFor t

26、he purposes of this British Standard, the terms and definitions given inBS EN ISO 13943, BS EN 60695-4 and the following apply.3.1 rated voltage, U0nominal power-frequency voltage between conductor(s) and earth, for whichthe cable is suitable3.2 rated voltage, Unominal power-frequency voltage betwee

27、n phase conductors for which thecable is suitable4 Categorization of cablesCables shall be tested to each of the three protocols, namely: resistance to fire alone, Protocol C (Clause 6); resistance to fire with water, Protocol W (Clause 7); resistance to fire with mechanical shock, Protocol Z (Claus

28、e 8).Cables passing all three protocols shall be designated Category CWZ.NOTE 1 Product standards might refer to only one of the protocols in Clauses 6, 7or 8 but in such cases, they may not use the designation “Category CWZ”.NOTE 2 Previous editions of this British Standard have included categories

29、 based onother protocols (A, B, S, X and Y). These are now regarded as obsolete.BRITISH STANDARD BS 6387:2013 The British Standards Institution 2013 15 Test chamberEach test shall be carried out in a chamber with facilities for disposing of anynoxious gases resulting from burning. Sufficient ventila

30、tion shall be available tosustain the burner flame for the duration of the test.The locations of any air inlets and exhaust chimney shall be such that the burnerflame remains stable during each test protocol. For each test protocol, the sameventilation and shielding conditions as used for the verifi

31、cation of the source ofheat shall be used.The temperature in the chamber shall be between 10 C and 40 C at the startof each test.6 Protocol C for resistance to fire alone6.1 Apparatus6.1.1 Test rig, comprising a cable supporting system (6.1.2), a circuit continuitychecking and voltage withstand arra

32、ngement and fuses (6.1.3 and 6.1.4) and asource of heat (6.1.5).6.1.2 Cable supporting system, in which the cable sample under test is heldhorizontally by means of a suitable clamp at one end of the sheathed orprotected portion and a support at the other end. The middle portion of thecable is suppor

33、ted by two metal rings placed approximately 300 mm apart andthese as well as any other metal parts of the supporting apparatus are earthed.The cable supporting arrangement is shown in Figure 1. For unarmoured cablesless than 10 mm in diameter, or for other cables where significant movement ofthe cab

34、le could occur during the test, the cable is supported by three additionalmetal supporting rings, each placed approximately 150 mm from the other tworings.6.1.3 Circuit continuity checking and voltage withstand arrangement, comprisinga three-phase star-connected transformer or three single-phase tra

35、nsformers (orone single-phase transformer if testing a single-core cable) of sufficient capacityto maintain the test voltage up to the maximum leakage current allowable,i.e. up to 2 A, and at the opposite end of the cable one or more lamps (withballast resistor if necessary) connected to each core w

36、ith a power rating suchthat each core carries a current of approximately 0.25 A at the rated voltage ofthe cable.6.1.4 Fuses, IEC 60269-3:2010 Fuse system AD, Type DII, 2A (Pink) or circuitbreakers with equivalent characteristics. In case of dispute the use of fuses shallbe the reference method.6.1.

37、5 Source of heat, comprising a tube-type gas burner with a burner facelength of 610 mm 10 mm, which produces a line of closely spaced flames usingpropane with a forced air supply.The temperature of the flames from the burner shall be set using a 1.5 mmType K thermocouple conforming to BS EN 60584-1,

38、 using the followingprocedure. Insert the thermocouple into the flame position at the end of theburner closest to the gas inlet with the thermocouple parallel to the burner andsituated 75 mm above it.With the thermocouple in position, light the burner and adjust the gas and airsupplies until a flame

39、 temperature of 950 C 40 C is steadily registered for atleast 5 min. Record the values of gas and air flow and switch the burner off.BRITISH STANDARDBS 6387:20132 The British Standards Institution 2013Figure1CablesupportingarrangementfortestforfireresistancealoneKey 1Clamp4Support2Metalrings5Gasburn

40、er3CablesampleBRITISH STANDARD BS 6387:2013 The British Standards Institution 2013 36.2 Cable sampleThe sample to be tested shall be a piece of the completed cable not less than1 200 mm long, with approximately 100 mm of the sheath and outer coveringsremoved from each end. At the ends of the cable t

41、he conductors shall beprepared for electrical connections in accordance with the manufacturersrecommendations.6.3 ProcedureMount the cable sample in the clamp as described in 6.1.2 and adjust the metalsupporting rings. Firmly clamp the cable at one end only.Connect the transformer or transformers to

42、 the conductors at one end of thecable, excluding any conductor that is specifically identified as intended for useas a neutral or protective conductor, as shown in the circuit diagram in Figure 2.For single, twin or three conductor cables, connect each conductor to beconnected to a separate phase o

43、f the transformer output witha2Afuse orequivalent circuit breaker (6.1.4) in each phase. For cables with more than threeconductors to be connected divide the conductors into three groups, ensuringthat adjacent conductors are in different groups, as far as possible. Connect theconductors in each grou

44、p in parallel and connect each group to a separatephase of the transformer output, witha2Afuse or equivalent circuit breaker ineach phase.At the transformer end of the sample, earth the neutral conductor, theprotective conductor and any drain wire and metallic layer. At the other end ofthe cable con

45、nect one terminal of a lamp as described in 6.1.3 to each phaseconductor and the other terminal to earth.Place the cable into position, so that it is parallel with the burner and the lowersurface of the cable is 75 mm above the burner, as shown in Figure 1.Figure 2 Circuit diagramKey1 Transformer 6

46、Sample2 Fuse (2A) 7 Metal screen (if present)3 Cable supports L1, L2, L3 Phase conductors (L2, L3 if present)4 Test conductor or group N Neutral conductor (if present)5 Load and indicating device (e.g. lamp) PE Protective earth (if present)BRITISH STANDARDBS 6387:20134 The British Standards Institut

47、ion 2013Light the burner using the gas and air settings obtained in 6.1.5, switch on theelectricity supply and adjust the voltage between phases to the rated voltage U(or in the case of a single-core cable to the rated voltage to earth U0). Continuethe test for3horuntil the cable fails, whichever ha

48、ppens first.If necessary, periodically clean the burner surface throughout the test, to ensurethe removal of fallen debris. If, for safety reasons, the test supply voltage needsto be switched off during the cleaning, extend the test time accordingly.6.4 Assessment of test specimen performanceIf, whe

49、n the cable sample is tested, none of the fuses ruptures and none of thelamps is extinguished during the period of the test the cable shall be deemed tohave passed the test.If the sample fails to meet these criteria, two further samples shall be preparedand tested. If both these samples meet the criteria, the cable shall be deemed tohave passed the test. If one or both samples fail to meet the criteria, the cableshall be deemed to have failed.7 Protocol W for resistance to fire with water7.1 Apparatus7.1.1 Test rig,