BS 8592-2016 Electric cables Thermosetting insulated non-armoured fire-resistant single core non-sheathed cables of rated voltage 450 750 V having low emission of smoke and corrosi.pdf

1、BSI Standards PublicationBS 8592:2016Electric cables Thermosetting insulated,non-armoured, fire-resistant,single core non-sheathedcables of ratedvoltage 450/750 V, havinglow emission of smoke andcorrosive gases whenaffected by fire SpecificationPublishing and copyright informationThe BSI copyright n

2、otice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2016Published by BSI Standards Limited 2016ISBN 978 0 580 90556 8ICS 29.060.20The following BSI references relate to the work on this document:Committee reference GEL/20/17Draft for comment

3、 15/30325295 DCPublication historyFirst published March 2016Amendments issued since publicationDate Text affectedBS 8592:2016 BRITISH STANDARDContentsForeword ii0 Introduction 11 Scope 12 Normative references 13 Terms and definitions 24 Rated voltage 35 Conductors 36 Insulation 37 Identification of

4、cable 58 Cable marking and additional information 59 Schedule of tests 710 Test conditions 811 Routine tests 812 Sample tests 913 Type tests 10AnnexesAnnex A (informative) Guide to use and installation of cables 11Annex B (informative) Notes on type tests 13Bibliography 15List of figuresFigure1Anexa

5、mple of the marking as used on the outer surface of thecable 6List of tablesTable 1 Maximum permitted voltages against rated voltage of cable 3Table 2 Thermosetting insulated, fire resistant, single-core cables, 450/750 V 4Table 3 Schedule of tests 8Table A.1 Constructional details, methods of insta

6、llation and temperature 12Table A.2 Guide to use 12Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 16, an inside back cover and a back cover.BRITISH STANDARD BS 8592:2016 The British Standards Institution 2016 iForewordPublishing informationThis

7、 British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 March 2016. It wasprepared by Subcommittee GEL/20/17, Low voltage cables, under the authorityof Technical Committee GEL/20, Electric cables. A list of organization

8、srepresented on these committees can be obtained on request to their secretary.Product certification/inspection/testingUsers of this British Standard are advised to consider the desirability ofthird-party certification/inspection/testing of product conformity with this BritishStandard. Users seeking

9、 assistance in identifying appropriate conformityassessment 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/orprocedures that can be injurious to health if adequate precautions are n

10、ottaken. It refers 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 q

11、ualified 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, explanation and general info

12、rmative 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.Compliance with a British Sta

13、ndard cannot confer immunity from legalobligations.BRITISH STANDARDBS 8592:2016ii The British Standards Institution 20160 IntroductionThis British Standard addresses a market need to standardize non-armoured,single core non-sheathed cables as a result of the proliferation of designs andrequirements

14、in the market.Performance under fire conditions is assessed on the basis of tests whichmeasure, under defined conditions, fire resistance, flame propagation andemission of smoke and corrosive gases.1 ScopeThis British Standard specifies requirements and test methods for theconstruction and performan

15、ce of non-armoured, single core non-sheathed cableswhich:a) have a thermosetting insulation of rated voltage 450/750 V;b) provide resistance to fire (circuit integrity), including mechanical shock, asmeasured by performance in a standard test;c) emit limited amounts of smoke and corrosive gases when

16、 burned asmeasured by a standard test;d) are flame retardant; ande) are primarily, but not exclusively, intended for use inside metal enclosuressuch as steel conduit.This British Standard is applicable to cables for use in fixed installations inindustrial areas, buildings and similar applications, w

17、here maintenance of powersupply during a fire is required for a defined period of time.NOTE 1 Attention is drawn to the fact that the ability of a given cable to meet thetest in this standard refers only to the test conditions stated, and the level ofperformance achieved in a particular installation

18、 can be influenced by actualinstallation conditions.The insulation and other components are suitable to permit operation of thecables at a maximum sustained conductor temperature of 90 C and for amaximum short-circuit conductor temperature of 250 C (for a maximum of 5 s).NOTE 2 Annex A gives recomme

19、ndations for the selection, installation andoperation of cables. Annex B 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 references, onlythe edition cited app

20、lies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 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 v

21、oltage energy cablesBS EN 50396, Non electrical test methods for low voltage energy cablesBS EN 60228, Conductors of insulated cablesBS EN 60332-1-2:2004+A1:2015, Tests on electric and optical fibre cables underfire conditions Part 1-2: Test for vertical flame propagation for a singleinsulated wire

22、or cable Procedure for 1 kW pre-mixed flameBRITISH STANDARD BS 8592:2016 The British Standards Institution 2016 1BS EN 60754-1, Test on gases evolved during combustion of materials fromcables Part 1: Determination of the halogen acid gas contentBS EN 60811-502, Electric and optical fibre cables Test

23、 methods fornon-metallic materials Part 502: Mechanical tests Shrinkage test forinsulationsBS EN 61034-2, Measurement of smoke density of cables burning under definedconditions Part 2: Test procedure and requirementsBS EN 62230, Electric cables Spark-test methodIEC 60050-461, International Electrote

24、chnical Vocabulary Part 461: ElectriccablesIEC 60331-3, Tests for electric cables under fire conditions Circuit integrity Part 3: Test method for fire with shock at a temperature of at least 830 C forcables of rated voltage up to and including 0,6/1,0 kV tested in a metalenclosure3 Terms and definit

25、ionsFor the purposes of this British Standard the terms and definitions given inIEC 60050-461 and the following apply.3.1 cable manufacturerorganization that has the capability to both produce and control the conformityof cable made in accordance with this British StandardNOTE See 8.1 a) for informa

26、tion on marking the cable with the cablemanufacturers name and identifier.3.2 fire resistanceability of a cable to maintain circuit integrity under fire for a stated period oftime and under defined conditionsNOTE The designation “fire resistant” given to a cable implies that it fulfils therequiremen

27、ts of the relevant fire resistance test.3.3 routine tests (R)tests made on all production lengths of cable to demonstrate their integrity3.4 sample tests (S)tests made on samples of completed cable, or components taken from acompleted cable adequate to verify that the product meets the designspecifi

28、cations3.5 type tests (T)tests made before supplying, on a general commercial basis, a type of cableconforming to this British Standard, in order to demonstrate satisfactoryperformance characteristics to meet the intended applicationNOTE Type tests are of such a nature that after they have been made

29、, 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 Values described as “approximate” do not constitute requirements t

30、o bechecked by measurement.BRITISH STANDARDBS 8592:20162 The British Standards Institution 20163.6.2 nominal valueNOTE Nominal values usually give rise to values to be checked by measurementstaking into account specified tolerances.3.7 voltages3.7.1 rated voltage, U0nominal power-frequency voltage b

31、etween conductor(s) and earth for which thecable is suitable3.7.2 rated voltage, Unominal power-frequency voltage between phase conductors for which thecable is suitable4 Rated voltageThe cables shall be designated by the rated voltages, U0and U, expressed in theform U0/U. The rated voltage recogniz

32、ed for the purpose of this BritishStandard shall be 450/750 V.NOTE The maximum permitted operating voltages of the system are stated inTable 1.In an alternating system, the rated voltage of the cable shall be at least equal tothe nominal voltage of the system for which it is intended.Table 1 Maximum

33、 permitted voltages against rated voltage of cableRated voltage of cable Maximum permitted operating voltage of the systema.c. 3-phase a.c. d.c.U0/U Conductor-earth,U0maxConductor-conductor,U maxConductor-earthConductor-conductorVVVVV450/750 480 825 620 1 2405 ConductorsThe conductors shall be annea

34、led copper, circular or circular compacted stranded(class 2), conforming to BS EN 60228.The manufacturer shall have the option to apply a tape or tapes over theconductor. These tapes shall not be considered as part of the insulation thicknessfor the purposes of testing or measurement.6 Insulation6.1

35、 Type of insulationThe insulation shall be type EI 5, as specified in BS EN 50363-5, and as modifiedbelow.a) Where the size of the cable is such that only tubular test pieces can be usedfor this test, the minimum requirements before ageing for tensile strengthand elongation at break shall be reduced

36、 to 8 N/mm2and 100%respectively.b) Corrosive and acid gas emission shall be assessed in accordance with 13.2.BRITISH STANDARD BS 8592:2016 The British Standards Institution 2016 36.2 ApplicationThe insulation shall be applied by an extrusion process and cross-linked. Theinsulation shall be applied e

37、ither in a single layer, or in a number of layers. Eachindividual layer shall be compact and homogeneous.Where more than one layer is used, the complete insulation shall be tested asthough it were a single layer.NOTE Insulation applied in more than one layer does not conform to the definitionof doub

38、le insulation given, for instance, in BS 7671.The manufacturer shall have the option to apply a tape or tapes under and/orover the insulation. These tapes shall not be considered as part of the insulationfor the purposes of testing or measurement.It shall be possible to remove the insulation without

39、 damage to the insulationitself or to the conductor. This shall be checked by visual examination.6.3 ThicknessThe mean value of the radial thickness of the insulation, when measured inaccordance with BS EN 50396, 4.1, shall be not less than the value given inTable 2. The smallest value measured, tm,

40、 shall not fall below 90% of the valuegiven in Table 2 by more than 0.1 mm, i.e.:tm0.9tn 0.1where:tmis the smallest value measured, in millimetres (mm);tnis the tabulated radial thickness, in millimetres (mm).The thickness of any tape(s) over the conductor shall not be included in themeasurement of

41、the thickness of the insulation.Table 2 Thermosetting insulated, fire resistant, single-core cables, 450/750 VNominal cross-sectionalarea of conductormm2Radial thickness ofinsulationmmApproximate overalldiametermmMinimum insulationresistance at 90CM.km1.5 0.7 3.5 0.01002.5 0.8 4.1 0.00904.0 0.8 4.6

42、0.00776.0 0.8 5.1 0.006510 1.0 6.7 0.006516 1.0 7.6 0.005025 1.2 9.4 0.005035 1.2 11.0 0.004350 1.4 12.4 0.004370 1.4 14.8 0.0035BRITISH STANDARDBS 8592:20164 The British Standards Institution 20166.4 Spark testing of insulationWhen tested in accordance with the a.c. or d.c. test methods and the tes

43、tvoltages specified in BS EN 62230, there shall be no breakdown of theinsulation.7 Identification of cable7.1 GeneralThe cables in this British Standard shall be identified by colour.7.2 Cable coloursThe cable colour shall be green-and-yellow, or any mono-colour.The colour shall be applied:a) throug

44、hout the insulation; orb) throughout the outermost layer of insulations that comprise more than onelayer; orc) via a dedicated colouring layer.Conformity shall be checked by visual examination.On the green-and-yellow cable, the distribution of these colours shall be suchthat on any 15 mm length of c

45、able, one of the colours shall cover at least 30%and not more than 70% of the surface of the cable, while the other colourcovers the remainder of the surface.Conformity shall be checked by measurement.NOTE 1 In cases of dispute regarding the green-and-yellow combination and whereappropriate to the m

46、ethod of colour marking of the insulation, a test method forchecking conformity is given in BS EN 50396, 5.2.NOTE 2 It is understood that the colours green and yellow when they arecombined as specified, are recognized as identifying exclusively the cable intendedfor use as an earth connection or sim

47、ilar protection. The colour blue is for theidentification of the cables intended to be connected to neutral but, if there is noneutral, blue can be used to identify any cable except for the earth or protectiveconductor.NOTE 3 According to the use to which the cables are put, they could be subject to

48、the colour requirements specified in BS 7671, in other British Standards, or inregulations or statutory requirements.7.3 Clarity and durabilityThe colour used for cable identification shall be clearly identifiable and durablesuch that it cannot be removed, when tested in accordance withBS EN 50396,

49、5.1.8 Cable marking and additional information8.1 External markingThe external surface of all cables within the scope of this British Standard shallbe legibly marked with the following elements.BRITISH STANDARD BS 8592:2016 The British Standards Institution 2016 5Element Example of markinga) Cable manufacturer Manufacturers name and their uniquefactory identifierNOTE 1 A simplified version of the manufacturers name, or a trading name ofthe manufacturer, can be used in place of the full name.NOTE 2 Any suitable method ca