BS 7629-1-2015 Electric cables Specification for 300 500 V fire resistant screened fixed installation cables having low emission of smoke and corrosive gases when affected by fire .pdf

1、BSI Standards PublicationBS 7629-1:2015Electric cables Specificationfor 300/500 V fire resistant,screened, fixed installationcables having low emissionof smoke and corrosivegases when affected by firePart 1: Multicore cablesPublishing and copyright informationThe BSI copyright notice displayed in th

2、is document indicates when the documentwas last issued. The British Standards Institution 2015Published by BSI Standards Limited 2015ISBN 978 0 580 85384 5ICS 13.220.99; 29.060.20The following BSI references relate to the work on this document:Committee reference GEL/20/17Draft for comment 14/302952

3、04 DCPublication historyFirst published April 1997Second edition November 2008Third (current) edition August 2015Amendments issued since publicationDate Text affectedBS 7629-1:2015 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Voltage designation and

4、fire resistance categories 35 Conductors and drain wire 56 Insulation 57 Identification of cores 68 Laying-up 79 Screen 810 Sheath 811 Cable marking and additional information 912 Schedule of tests 1113 Test conditions 1314 Routine tests 1315 Sample tests 1416 Type tests 16AnnexesAnnex A (informativ

5、e) Guide to selection, installation and operation 17Annex B (normative) Method of test for continuity of tinned coatings ofwires 20Annex C (normative) Method of test for voltage withstand 20Annex D (normative) Method of test for bending characteristics 21Annex E (normative) Method of test for resist

6、ance to impact 21Annex F (normative) Method of test for shrinkage of sheath on cable duringheat treatment 22Annex G (informative) Notes on type tests 23Bibliography 26List of figuresFigure 1 Lay up diagram of multi-core auxiliary cables (7-core, 12-coreand 19-core) 7Figure 2 Example of the marking a

7、s used on the outer sheath of the cable 10Figure E.1 Chisel-edged intermediate piece for test for resistance to impact 22List of tablesTable 1 Maximum permitted voltages against rated voltage of cable 4Table 2 Dimensions of 2-core, 3-core and 4-core cables 4Table 3 Dimensions of multi-core auxiliary

8、 cables 5Table 4 Identification of cores in multicore cables 6Table 5 Schedule of tests 12Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 26, an inside back cover and a back cover.BRITISH STANDARD BS 7629-1:2015 The British Standards Institution

9、 2015 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 August 2015. It wasprepared by Subcommittee GEL/20/17, Low voltage cables, under the authorityof Technical Committee GEL/2

10、0, Electric cables. A list of organizationsrepresented on these committees can be obtained on request to their secretary.SupersessionThis British Standard supersedes BS 7629-1:2008, which will be withdrawnon 31 August 2016.Relationship with other publicationsThis new edition of BS 7629-1 takes accou

11、nt of the publication ofBS 5266-1:2011 and BS 5839-1:2013 and their increased fire testing requirements.Information about this documentThis is a full revision of the standard and introduces the following principalchanges.a) The marking arrangements are updated and clarified.b) Test methods are updat

12、ed to reflect the latest CENELEC harmonization.c) This new edition takes account of: BS EN 50395 (replacing Annex E of BS 7629-1:2008) on electrical tests; BS EN 50396 (replacing Annex B of BS 7629-1:2008) on thicknessmeasurement; BS EN 60332-1-2 (replacing BS EN 50265-2-1) on flame propagation of a

13、single cable; BS EN 62230 (replacing BS EN 50356 and BS 5099) on spark testing.Product certification/inspection/testing. Users of this British Standard are advisedto consider the desirability of third-party certification/inspection/testing ofproduct conformity with this British Standard. Users seeki

14、ng assistance inidentifying appropriate conformity assessment bodies or schemes may ask BSI toforward their enquiries to the relevant association.WARNING. This British Standard calls for the use of substances and/orprocedures that can be injurious to health if adequate precautions are nottaken. It r

15、efers only to technical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.Use of this documentIt has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately qualified ande

16、xperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative mater

17、ial is presented insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 7629-1:2015ii The British Standards Institution 2015Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible

18、 for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7629-1:2015 The British Standards Institution 2015 iiiBRITISH STANDARDBS 7629-1:2015This page deliberately left blankiv The British Standards Institution 20151 ScopeThis B

19、ritish Standard specifies requirements and test methods for theconstruction and performance of cables which: have thermosetting insulation and a rated voltage of 300/500 V; provide resistance to fire (circuit integrity), including with mechanical shockand with water, as measured by performance in a

20、standard test or tests; emit limited amounts of smoke and corrosive gases when burned asmeasured by a standard test; and are primarily intended for use in emergency lighting, fire detection and firealarm system circuits.The circuit integrity performance under fire conditions is assessed on the basis

21、 oftests which measure resistance to fire with mechanical impact and water spray(Categories: Standard 30, Standard 60 and Enhanced 120).NOTE 1 BS 5266-1 and BS 5839-1 give recommendations and guidance on thefactors to be taken into account in the planning, design, installation, commissioningand main

22、tenance of emergency lighting, fire detection and fire alarm systems forbuildings, respectively.It is applicable to 2-core, 3-core and 4-core circular cables with an uninsulatedfull size circuit protective conductor, and 7-core, 12-core and 19-core circularmulti-core auxiliary cables with an uninsul

23、ated drain wire of not less than0.5 mm2. All cables contain a metallic layer, which provides electrostaticscreening.The cables are suitable for operation at a maximum sustained conductortemperature of 70 C and for a maximum short-circuit conductor temperatureof 250 C (for a maximum period of 5 s).NO

24、TE 2 Annex A gives recommendations for the selection, installation andoperation of cables, Annex B gives the method of test for continuity of tinnedcoating of wires, Annex C gives the method of test for voltage withstand, Annex Dgives the method of test for bending characteristics, Annex E gives the

25、 method oftest for resistance to impact, Annex F gives the method of test for shrinkage ofsheath and Annex G gives notes on type tests.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated r

26、eferences, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 7655-1.2, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insulating compounds Section 1.2:General 90

27、C applicationBS 7655-6.1, Specification for insulating and sheathing materials for cables Part 6: Thermoplastic sheathing compounds having low emission of corrosivegases, and suitable for use in cables having low emission of smoke whenaffected by fire Section 6.1: General application thermoplastic t

28、ypesBS 7671, Requirements for electrical installations IET Wiring Regulations Seventeenth editionBS 8434-2, Methods of test for assessment of the fire integrity of electric cables Part 2: Test for unprotected small cable for use in emergency circuits BS EN 50200 with a 930 C flame and with water spr

29、ayBRITISH STANDARD BS 7629-1:2015 The British Standards Institution 2015 1BS EN 50200, Method of test for resistance to fire of unprotected small cablesfor use in emergency circuitsBS EN 50363-1, Insulating, sheathing and covering materials for low voltageenergy cables Part 1: Cross-linked elastomer

30、ic insulating compoundsBS EN 50363-5, Insulating, sheathing and covering materials for low voltageenergy cables Part 5: Halogen-free, cross-linked insulating compoundsBS EN 50395, Electrical test methods for low voltage energy cablesBS EN 50396, Non electrical test methods for low voltage energy cab

31、lesBS EN 60228, Conductors of insulated cablesBS EN 60332-1-2:2004, Tests on electric and optical fibre cables under fireconditions Part 1-2: Test for vertical flame propagation for a single insulatedwire or cable Procedure for 1 kW pre-mixed flameBS EN 60754-1, Test of gases evolved during combusti

32、on of materials fromcables Part 1: Determination of the halogen acid gas contentBS EN 60811-502, Electric and optical fibre cables Test methods fornon-metallic materials Part 502: Mechanical tests Shrinkage test forinsulationsBS EN 60811-506, Electric and optical fibre cables Test methods fornon-met

33、allic materials Part 506: Mechanical tests Impact test at lowtemperature for insulations and sheathsBS EN 61034-1, Measurement of smoke density of cables burning under definedconditions Part 1: Test apparatusBS EN 61034-2, Measurement of smoke density of cables burning under definedconditions Part 2

34、: Test procedure and requirementsBS EN 62230, Electric cables Spark-test methodIEC 60050-461, International electrotechnical vocabulary Part 461: Electriccables3 Terms and definitionsFor the purposes of this British Standard, the terms and definitions given inIEC 60050-461 and the following apply.3.

35、1 cable manufacturerorganization that has the capability to both produce and control the conformityof cable made to this British StandardNOTE See 11.1a) for information on marking the cable with the cablemanufacturers name and identifier.3.2 fire resistanceability of a cable to maintain circuit inte

36、grity under fire for a stated period oftime and under defined conditionsNOTE The designation “fire resistant” given to a cable implies that it fulfils therequirements of the relevant fire resistance test.3.3 length of layaxial length of one complete turn of the helix formed by one cable component3.4

37、 routine tests, Rtests made on all production cable lengths to demonstrate their integrityBRITISH STANDARDBS 7629-1:20152 The British Standards Institution 20153.5 sample tests, Stests made on samples of completed cable, or components taken from acompleted cable, adequate to verify that the product

38、meets the designspecifications3.6 type tests, Ttests made before supplying, on a general commercial basis, a type of cablecovered by this British Standard, in order to demonstrate satisfactoryperformance characteristics to meet the intended applicationNOTE Type tests are of such a nature that after

39、they have been made, they neednot be repeated unless changes are made in the cable materials, design or type ofmanufacturing process, which might change the performance characteristics.3.7 values3.7.1 approximate valuevalue which is only indicativeNOTE Values described as “approximate” do not consti

40、tute requirements to bechecked by measurement.3.7.2 nominal valuevalue by which a quantity is designatedNOTE Nominal values usually give rise to values to be checked by measurementstaking into account specified tolerances.3.8 voltages3.8.1 maximum voltage, Ummaximum sustained power-frequency voltage

41、 between phase conductors forwhich the cable is suitable3.8.2 rated voltage, U0nominal power-frequency voltage between conductor(s) and earth for which thecable is suitable3.8.3 rated voltage, Unominal power-frequency voltage between phase conductors for which thecable is suitable4 Voltage designati

42、on and fire resistance categories4.1 Voltage designationThe cables shall be designated by the rated voltages U0and U, expressed in theform U0/U. The rated voltage recognized for the purpose of this British Standardshall be 300/500 V.NOTE 1 The maximum permitted operating voltages of the system are s

43、tated inTable 1.In an alternating current system, the rated voltage of the cable shall be at leastequal to the nominal voltage of the system for which it is intended.NOTE 2 Guidance on the selection of cables of appropriate voltage designations forparticular systems is given in A.4.BRITISH STANDARD

44、BS 7629-1:2015 The British Standards Institution 2015 3Table 1 Maximum permitted voltages against rated voltage of cableRated voltageof cableMaximum permitted operating voltage of the systema.c. 3-phase a.c. d.c.U0/U Conductor-earth Conductor-conductorConductor-earth Conductor-conductorV U0max (V) U

45、 max (V) V V300/500 320 550 410 8204.2 Fire resistance categoryCables shall be designated by category according to their special fire resistancecharacteristics as follows: Category STANDARD 30: resistance to fire with mechanical impact and waterassessed in combination when tested in accordance with

46、15.6.2; Category STANDARD 60: resistance to fire with mechanical impact and waterassessed in combination when tested in accordance with 15.6.3; Category ENHANCED 120: resistance to fire with mechanical impact andwater assessed in combination when tested in accordance with 15.6.4.The 2-core, 3-core a

47、nd 4-core cables given in Table 2 and the multi-core auxiliarycables given in Table 3 (7-core, 12-core and 19-core) shall conform to one of thefollowing categories: STANDARD 30, STANDARD 60 or ENHANCED 120. Themanufacturer shall declare which category a cable meets.If a cable conforms to the require

48、ments for category STANDARD 60 it shall alsobe deemed to conform to the requirements for category STANDARD 30 and thetests stated in 15.6.2 shall not be required to be carried out.If a cable conforms to the requirements for category ENHANCED 120 it shall notbe required to conform to other categories

49、. If, in addition to ENHANCED 120,conformity to other categories is being claimed then the appropriate tests shallbe carried out.NOTE Attention is drawn to the fact that the level of performance achieved in aparticular installation can be influenced by the actual installation conditions.Conformity of a given cable to the requirements for a particular category in thisstandard refers only to the test condition stated.Table 2 Dimensions of 2-core, 3-core and 4-core cablesNumber ofcoresNominalcross-