BS 7846-2015 Electric cables Thermosetting insulated armoured fire-resistant cables of rated voltage 600 1 000 V for fixed installations having low emission of smoke and corrosive .pdf

1、BSI Standards PublicationBS 7846:2015Electric cables Thermosetting insulated,armoured, fire-resistantcables of ratedvoltage 600/1 000 V forfixed installations, havinglow emission of smoke andcorrosive gases whenaffected by fire SpecificationPublishing and copyright informationThe BSI copyright notic

2、e displayed in this document indicates when the documentwas last issued. The British Standards Institution 2015Published by BSI Standards Limited 2015ISBN 978 0 580 86731 6ICS 13.220.99; 29.060.20The following BSI references relate to the work on this document:Committee reference GEL/20Draft for com

3、ment 15/30301742 DCPublication historyFirst published September 1996Second edition, October 2000Third edition, September 2009Fourth (current) edition, November 2015Amendments issued since publicationDate Text affectedBS 7846:2015 BRITISH STANDARDContents1 Scope 12 Normative references 13 Terms and d

4、efinitions 24 Voltage designation and fire resistance categories 35 Conductors 56 Insulation 57 Identification of cores 58 Laying-up 79 Bedding 710 Armour 811 Oversheath 912 Cable marking and additional information 913 End sealing 1214 Schedule of tests 1315 Test conditions 1416 Routine tests 1417 S

5、ample tests 1518 Type tests 17AnnexesAnnex A (informative) Guide to use and installation of cables 22Annex B (normative) Armour wire tests 28Annex C (normative) Compatibility test 30Annex D (normative) Abrasion resistance test 31Annex E (normative) Insulation resistance constant test on oversheath 3

6、1Annex F (normative) Resistance of armour 32Annex G (informative) Gross cross-sectional area of armour 33Annex H (normative) Test for shrinkage of oversheath 34Annex I (normative) Fire resistance test for category F2 Additional provisionsfor cables with a diameter over 20 mm 35Annex J (informative)

7、Guidance on type tests 37Bibliography 41List of figuresFigure1Anexample of the marking on the oversheath of the cable 11Figure I.1 Method of mounting a sample for test for resistance to fire withmechanical shock 36List of tablesTable 1 Maximum permitted voltages against rated voltage of cable 4Table

8、 2 Diameter of armour wire and mass of zinc coating 8Table 3 Schedule of tests 13Table4Twocore 600/1 000 V cables with copper conductors 18Table 5 Three core 600/1 000 V cables with copper conductors 19Table 6 Four core 600/1 000 V cables with copper conductors 20Table 7 Five core 600/1 000 V cables

9、 with copper conductors 21Table 8 Multicore auxiliary 600/1 000 V cables with copper conductors 21Table A.1 Selection of cables for a.c. systems 23Table A.2 Test voltages after installation 28Table B.1 Temperature correction multiplication factors 29Table C.1 Compatibility requirements 30Table D.1 V

10、ertical load requirements 31Table F.1 Maximum resistance of armour for two-, three-, four- and five-corecable 32BRITISH STANDARD BS 7846:2015 The British Standards Institution 2015 iTable F.2 Maximum resistance of armour for 600/1 000 V multicore auxiliarycables 32Table G.1 Gross cross-sectional are

11、a of armour wires for the two-, three-,four- and five-core 600/1 000 V cable 33Table G.2 Gross cross-sectional area of armour wires for 600/1 000 V multicoreauxiliary cable 33Table J.1 Test schedule for the smoke emission test 38Summary of pagesThis document comprises a front cover, an inside front

12、cover, pages i to iv,pages 1 to 42, an inside back cover and a back cover.BRITISH STANDARDBS 7846:2015ii The British Standards Institution 2015ForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into

13、 effect on 30 November 2015. Itwas prepared by Technical Committee GEL/20, Electric cables. A list oforganizations represented on this committee can be obtained on request to itssecretary.SupersessionThis British Standard supersedes BS 7846:2009, which will be withdrawnon 1 December 2016.Information

14、 about this documentThis is a full revision of the standard, and introduces the following principalchanges.a) Interlocked tape armour has been removed as it no longer has marketrelevance.b) 48 core auxiliary cables have been removed as they are no longer marketrelevant.c) The marking requirements ha

15、ve been updated and clarified.d) The guide to use given in Annex A has been updated to reflect moderninstallation practice and the recommendations in BS 8519:2010.e) Test methods have been updated in accordance with the latestBS EN standards.The new edition takes account of: BS EN 50363 (replacing c

16、ertain parts of BS 7655) on materials; BS EN 50395 (replacing Annex K of BS 7846:2009) on electrical tests; BS EN 50396 (replacing Annex D of BS 7846:2009) on thicknessmeasurement; BS EN 60332-1-2 (replacing BS EN 50265-2-1); BS EN 60332-3-24 (replacing BS EN 50266-2-4); BS EN 62230 (replacing BS EN

17、 50356 and BS 5099) on spark testing.Product certification/inspection/testingUsers of this British Standard are advised to consider the desirability ofthird-party certification/inspection/testing of product conformity to this BritishStandard. Users seeking assistance in identifying appropriate confo

18、rmityassessment bodies or schemes may ask BSI to forward their enquiries to therelevant association.Hazard warningsWARNING. This British Standard calls for the use of substances and/or proceduresthat can be injurious to health if adequate precautions are not taken. It refersonly to technical suitabi

19、lity and does not absolve the user from legal obligationsrelating to health and safety at any stage.BRITISH STANDARD BS 7846:2015 The British Standards Institution 2015 iiiUse of this documentIt has been assumed in the preparation of this British Standard that theexecution of its provisions will be

20、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. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary,

21、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 of acontract. Users are responsible for its correct application.C

22、ompliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 7846:2015iv The British Standards Institution 20151 ScopeThis British Standard specifies requirements for construction and performance ofthermosetting insulated, armoured, fire-resistant cables of rated

23、voltage 600/1 000 V having low emission of smoke and corrosive gases whenaffected by fire.This British Standard is applicable to cables for use in fixed installations inindustrial areas, buildings or similar applications, where maintenance of powersupply during a fire is required for a defined perio

24、d of time.This British Standard specifies requirements for the following types of cables:a) wire armoured and oversheathed cables with two-, three-, four- orfive-cores, and with stranded copper conductor;b) multicore auxiliary cables, wire armoured and oversheathed, with strandedcopper conductor.Thi

25、s British Standard specifies four categories of cables based on theirperformance in tests which assess separately resistance to fire, resistance to firewith water spray and resistance to fire with mechanical shock (Category F2) andwhich assess resistance to fire with direct mechanical impact and wat

26、er jet incombination (Categories F30, F60 and F120).This British Standard is applicable to cables that are designed for a maximumsustained conductor temperature of 90 C and for a maximum short-circuitconductor temperature of 250 C (for a maximum of 5 s).NOTE 1 Limitation on the temperature of the ca

27、bles might be imposed in situationswhere they may be touched or where they could touch other materials.NOTE 2 Annex A gives the guide to use, Annex B gives armour wire tests, Annex Cgives compatibility test, Annex D gives abrasion test, Annex E gives insulationresistance constant test on oversheath,

28、 Annex F gives resistance of conductor andarmour, Annex G gives gross cross-sectional area of armour, Annex H gives a test forshrinkage of oversheath, Annex I gives the fire resistance test for category F2 additional provisions for cables with a diameter over 20 mm, and Annex J givesnotes on type te

29、sts.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amend

30、ments) applies.BS 6387, Test method for resistance to fire of cables required to maintain circuitintegrity under fire conditionsBS 7655-1.2, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insulating compounds Section 2: General 90CapplicationBS 7655-

31、1.3, Specification for insulating and sheathing materials for cables Part 1: Elastomeric insulating compounds Section 3: XLPEBS 7655-6.1, Specification for insulating and sheathing materials for cables Part 6: Thermoplastic sheathing compounds having low emission of corrosivegases, and suitable for

32、use in cables having low emission of smoke whenaffected by fire Section 1: General application thermoplastic typesBS 7671, Requirements for electrical installations IET Wiring Regulations Seventeenth editionBRITISH STANDARD BS 7846:2015 The British Standards Institution 2015 1BS 8491, Method for ass

33、essment of fire integrity of large diameter power cablesfor use as components for smoke and heat control systems and certain otheractive fire safety systemsBS EN 10244-2:2009, Steel wire and wire products Non-ferrous metalliccoatings on steel wire Part 2: Zinc or zinc alloy coatingsBS EN 50363-5, In

34、sulating, 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 electric cablesBS EN 60228, Conductors of insulate

35、d cablesBS EN 60229, Electric cables Tests on extruded oversheaths with a specialprotective functionBS EN 60332-1-2:2004, Tests on electric and optical fibre cables under fireconditions Part 1: Test for vertical flame propagation for a single insulatedwire or cable Procedure for 1 kW pre-mixed flame

36、BS EN 60332-3-24:2009, Tests on electric and optical fibre cables under fireconditions Part 3: Test for vertical flame spread of vertically-mounted bunchedwires or cables Category CBS EN 60754-1, Test on gases evolved during combustion of materials fromcables Part 1: Determination of the halogen aci

37、d gas contentBS EN 60811-401, Electric and optical fibre cables Test methods fornon-metallic materials Part 401: Miscellaneous tests Thermal ageing methods Ageing in an air ovenBS EN 60811-501, Electric and optical fibre cables Test methods fornon-metallic materials Part 501: Mechanical tests Tests

38、for determining themechanical properties of insulating and sheathing compoundsBS EN 60811-502, Electric and optical fibre cables Test methods fornon-metallic materials Part 502: Mechanical tests Shrinkage test forinsulationsBS EN 61034-2, Measurement of smoke density of cables burning under definedc

39、onditions Part 2: 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 fo

40、llowing apply.3.1 cable manufacturerorganization that has the capability to both produce and control the conformityof cable made to this British StandardNOTE See 12.1a) for information on marking the cable with the cablemanufacturers name and identifier.3.2 length of layaxial length of one complete

41、turn of the helix formed by one cable component3.3 routine tests, Rtests made on all production cable lengths to demonstrate their integrityBRITISH STANDARDBS 7846:20152 The British Standards Institution 20153.4 sample tests, Stests made on samples of completed cable, or components taken from acompl

42、eted cable, adequate to verify that the product meets the designspecifications3.5 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 application

43、NOTE Type tests are of such a nature that after 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.3.6 values3.6.1 approximate valuevalue which is only indicativeNOTE

44、 Values described as “approximate” do not constitute requirements to bechecked by measurement.3.6.2 nominal valuevalue by which a quantity is designatedNOTE Nominal values usually give rise to values to be checked by measurementstaking into account specified tolerances.3.7 voltages3.7.1 maximum volt

45、age, Ummaximum sustained power-frequency voltage between phase conductors forwhich the cable is suitable3.7.2 rated voltage, U0nominal power-frequency voltage between conductor(s) and earth for which thecable is suitable3.7.3 rated voltage, Unominal power-frequency voltage between phase conductors f

46、or which thecable is suitable3.8 fire resistanceability of a cable to maintain circuit integrity under fire for a stated period oftime and under defined conditionsNOTE The designation 9fire resistant9 given to a cable implies that it fulfils therequirements of the relevant fire resistance test.4 Vol

47、tage designation 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 standard shallbe 600/1 000 V.NOTE 1 The maximum permitted operating voltages of the syste

48、m are stated inTable 1.BRITISH STANDARD BS 7846:2015 The British Standards Institution 2015 3In 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

49、 voltage designations forparticular systems is given in A.4.4.2 Fire resistance categoriesCables shall be designated by category according to their fire resistancecharacteristics as follows:a) Category F2. Resistance to fire, resistance to fire with water, resistance tofire with mechanical shock, assessed separately, when tested in accordancewith 17.6.2;b) Category F30. Resistance to fire with direct mechanical impact and water jetassessed in combination, when te