BS 8436-2011 Electric cables Specification for 300 500 V screened electric cables having low emission of smoke and corrosive gases when affected by fire for use in walls partitions.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 8436:2011Electric cables Specificationfor 300/500 V screenedelectric cables having lowemission of smoke andcorrosive gases whenaffected by fire, for use inwalls, partitions an

2、dbuilding voids MulticorecablesPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. BSI 2011ISBN 978 0 580 71709 3ICS 13.220.99; 29.060.20The following BSI references relate to the work on this standard:Committee referenc

3、e GEL/20/17Draft for comment 10/30228489 DCPublication historyFirst published April 2004Second (present) edition April 2011Amendments issued since publicationDate Text affectedBS 8436:2011 BRITISH STANDARDContents1 Scope 12 Normative references 13 Terms and definitions 24 Voltage designation 35 Cond

4、uctors 36 Insulation 37 Identification of cores 58 Laying up 59 Screen 510 Sheath 611 Cable marking and additional information 612 Requirements for safe selection of protective devices and maximumcurrent rating of cables 813 Schedule of tests 814 Routine test for complete cables 815 Sample tests for

5、 completed cables 1016 Type tests for completed cables 10AnnexesAnnex A (informative) Recommendations for the selection, operation andinstallation of cables 12Annex B (normative) Measurement of insulation and sheath thickness 13Annex C (normative) Test conditions 13Annex D (normative) Method of test

6、 for insulation faults 14Annex E (normative) Method of test for voltage withstand 14Annex F (normative) Method of test for bending characteristics 14Annex G (normative) Method of test for resistance to impact 15Annex H (normative) Method of test for nail penetration 16Bibliography 19List of figuresF

7、igure1Anexample of the marking as used on the outer sheath of thecable 7Figure G.1 Chisel-edged intermediate piece for test for resistance to impact 15List of tablesTable 1 Dimensions of cables 4Table 2 Identification of cores 5Table 3 Schedule of tests 9Table H.1 Minimum test current for nail penet

8、ration test 17Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 20, an inside back cover and a back cover.BRITISH STANDARD BS 8436:2011 BSI 2011 iForewordPublishing informationThis British Standard is published by BSI and came into effect on 30 Ap

9、ril 2011. Itwas prepared by Subcommittee GEL/20/17, Low voltage cables, under theauthority of Technical Committee GEL/20, Electric cables. A list of organizationsrepresented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 8436:2004, which

10、 is withdrawn.Relationship with other publicationsThe new edition takes account of: BS EN 60228 (replacing BS 6360) on conductors; BS EN 50363 (replacing certain parts of BS 7655) on materials; BS EN 60332-1-2 (replacing BS EN 50265-2-1) and BS EN 61034 (replacingBS EN 50268) on reaction to fire per

11、formance tests; BS EN 62230 (replacing BS EN 50356) on spark testing.Information about this documentThis is a full revision of the standard, and introduces the following principalchanges:a) the range of cables specified is extended;b) the marking arrangements are clarified;c) the fundamental safety

12、test relating to nail penetration is improved;d) the relationship between the sizes and types of protective devices (circuitbreakers) is clarified.Product certification/inspection/testing. Users of this British Standard are advisedto consider the desirability of third-party certification/inspection/

13、 testing ofproduct conformity with this British Standard. Users seeking assistance inidentifying appropriate conformity assessment bodies or schemes may ask BSI toforward their enquiries to the relevant association.Hazard warningsWARNING. This British Standard calls for the use of substances and/orp

14、rocedures that can be injurious to health if adequate precautions are nottaken. It refers only to technical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stagePresentational conventionsThe provisions in this standard are presented in roman (i.e.

15、 upright) type. Itsrequirements are expressed in sentences in which 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 doe

16、s not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.BRITISH STANDARDBS 8436:2011ii BSI 2011Compliance with a British Standard cannot confer immunity from legalobligations.Attention is drawn to the following regulations:The Electricity

17、 Safety, Quality and Continuity Regulations 2002 1BRITISH STANDARD BS 8436:2011 BSI 2011 iiiBRITISH STANDARDBS 8436:2011This page deliberately left blankiv BSI 20111 Scope This British Standard specifies requirements and test methods for theconstruction and performance of cables that: have a thermos

18、etting insulation of rated voltage 300/500 V; emit limited amounts of smoke (see 15.5) and corrosive gases whensubjected to relevant tests; are primarily intended for use in walls, partitions and building voids; have a screen that can carry the fault current required for a selected sizeand type of p

19、rotective device, that operates within a given time if the cableis penetrated by a nail or similar fixing (see 16.4).To achieve a satisfactory safety performance of the cable when installed, boththe selection of protective device and the maximum current rating is critical.NOTE 1 See Clause 12 for th

20、e requirements of the safe selection of protectivedevices and maximum current rating of cables.It is applicable to 2-core, 3-core and 4-core cables with an uninsulated, full-sizecircuit protective conductor and metallic screening.NOTE 2 A guide to the use of the cables specified in this British Stan

21、dard is given inAnnex A.2 Normative referencesThe following referenced documents are indispensable for the application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 5099

22、, Electric cables Voltage levels for spark testingBS 7655-1.2, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insulating compounds Section 1.2: General 90C applicationBS 7655-1.3, Specification for insulating and sheathing materials for cables Part 1

23、: Cross-linked elastomeric insulating compounds Section 1.3: 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 use in cables having low emission of smoke whenaffected by f

24、ire Section 6.1: General application thermoplastic typesBS 7671:2008, Requirements for electrical installations IEE Wiring Regulations Seventeenth editionBS EN 10230-1:2000, Steel wire nails Part 1: Loose nails for general applicationsBS EN 13603:2002, Copper and copper alloys Test methods for asses

25、singprotective tin coatings on drawn round copper wire for electrical purposesBS EN 50267-2-1, Common test methods for cables under fire conditions Testson gases evolved during combustion of materials from cables Part 2-1:Procedures Determination of the amount of halogen acid gasBS EN 50363-5, Insul

26、ating, sheathing and covering materials for low voltageenergy cables Part 5: Halogen-free, cross-linked insulating compoundsBS EN 60228, Conductors of insulated cablesBRITISH STANDARD BS 8436:2011 BSI 2011 1BS EN 60332-1-2:2004, Tests on electric and optical fibre cables under fireconditions Part 1-

27、2: Test for vertical flame propagation for a single insulatedwire or cable Procedure for 1 kW pre-mixed flameBS EN 60811-1-1, Insulating and sheathing materials of electric and optical cables Common test methods Part 1-1: General application Measurement ofthickness and overall dimensions Tests for d

28、etermining the mechanicalpropertiesBS EN 60811-1-3, Insulating and sheathing materials of electric and optical cables Common test methods Part 1-3: General application Methods fordetermining the density Water absorption tests Shrinkage testBS EN 60898, Electrical accessories Circuit-breakers for ove

29、rcurrent protectionfor household and similar installationsBS EN 61009-1, Residual current operated circuit-breakers with integralovercurrent protection for household and similar uses (RCBOs) Part 1: GeneralrulesBS EN 61034-1, Measurement of smoke density of cables burning under definedconditions Par

30、t 1: Test ApparatusBS EN 61034-2:2005, Measurement of smoke density of cables burning underdefined conditions Part 2: Test procedure and requirementsBS EN 62230, Electric cables Spark-test methodIEC 60050-461, International Electrotechnical Vocabulary Part 461: Electriccables3 Terms and definitionsF

31、or 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 to this standardNOTE See Clause 11.1, a) for information on marking the

32、cable with the cablemanufacturers name and identifier.3.2 let-through energy, I2tenergy let-through value of a device, measured in amperes squared seconds(A2s)3.3 routine tests, Rtests made on all production cable lengths to demonstrate their integrity3.4 sample tests, Stests made on samples of comp

33、leted cable, or components taken from acompleted cable, adequate to verify that the product meets the designrequirements3.5 type tests, Ttests made before supplying, on a general commercial basis, a type of cablecovered by this standard, in order to demonstrate satisfactory performancecharacteristic

34、s to meet the intended applicationNOTE These tests are of such a nature that after they have been made, they neednot be repeated unless changes are made in the cable material, design or type ofmanufacturing process, which might change the performance characteristics.BRITISH STANDARDBS 8436:20112 BSI

35、 20113.6 values3.6.1 approximate valuevalue which is only indicativeNOTE 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 measurement

36、staking into account specified tolerances.3.7 voltages3.7.1 maximum voltage, Ummaximum sustained power-frequency voltage between phase conductors forwhich the cable is suitable3.7.2 rated voltage, Unominal power-frequency voltage between phase conductors for which thecable is suitable3.7.3 rated vol

37、tage, Uonominal power-frequency voltage between conductor(s) and earth for which thecable is suitable4 Voltage designationThe cables shall be designated by the rated voltages Uoand U, expressed in theform Uo/U. The rated voltage recognized for the purpose of this British Standardshall be 300/500 V.5

38、 ConductorsThe conductors shall conform to BS EN 60228, class 1, 2 or 5. The insulatedconductors shall be plain or tinned annealed copper. The uninsulated circuitprotective conductors shall be tinned annealed copper and shall be of the samenominal cross-sectional area as the insulated conductors.Tin

39、ned coated wires shall conform to BS EN 13603:2002, Clause 5.The class of conductor shall be the same for all conductors in any single cable.The uninsulated circuit protective conductor shall be of the same class as theinsulated conductors.6 Insulation6.1 TypeThe insulation shall be one of the follo

40、wing types: EI 5, as specified in BS EN 50363-5; GP 4 or GP 6, as specified in BS 7655-1.2; GP 8, as specified in BS 7655-1.3.BRITISH STANDARD BS 8436:2011 BSI 2011 3NOTE 1 BS EN 50363-5 specifies various requirements for assessing the insulationscorrosive and acid gas emission. To conform to this B

41、ritish Standard, it is onlynecessary to assess corrosive and acid gas emission in accordance with 6.5, regardlessof insulation types.NOTE 2 A tape or tapes can be applied over either the conductor or the insulation.6.2 ApplicationThe insulation shall be applied closely to the conductor or conductor

42、taping bythe extrusion process and cross-linked to form a compact and homogeneouslayer.NOTE 1 The insulation can be applied in a single layer or in a number of cohesivelayers.Where more than one layer is used, all testing specified in this British Standardshall be carried out on the complete insulat

43、ion as though it were a single layerof the declared insulation type (see 6.1).NOTE 2 Insulation applied in more than one layer does not conform to thedefinition of “double insulation” given, for instance, in BS 7671.When the application is tested by removing the insulation from the conductor,there s

44、hall be no damage to the insulation itself, the conductor or the tincoating (if any).6.3 ThicknessThe thickness of the insulation, when determined by taking the average of anumber of measurements in accordance with Annex B, shall be not less than thevalue specified in Table 1, and the smallest of th

45、e measured values shall not fallbelow the value given in Table 1 by more than 0.1 mm + 10%.The thickness of any tape(s) over either the conductor or the insulation shall notbe included in the measurement of thickness of insulation.6.4 Spark testWhen tested in accordance with BS EN 62230, using the t

46、est voltages specified inBS 5099, there shall be no breakdown of the insulation.Table 1 Dimensions of cablesNumber of cores Nominalcross-sectionalarea of conductormm2Radial thicknessof insulationmmRadial thicknessof sheathmmApproximateoverall diametermm2 1.0 0.6 0.9 8.01.5 0.7 0.9 8.52.5 0.7 1.0 10.

47、54.0 0.7 1.1 12.53 1.0 0.6 0.9 8.51.5 0.7 0.9 9.52.5 0.7 1.0 11.54.0 0.7 1.1 13.54 1.0 0.6 1.0 9.01.5 0.7 1.0 10.52.5 0.7 1.1 12.04.0 0.7 1.2 15.0BRITISH STANDARDBS 8436:20114 BSI 20116.5 Corrosive and acid gas emission from insulation and tapesduring combustionWhen tested in accordance with BS EN 5

48、0267-2-1, the level of HCl shall be notgreater than 0.5%.7 Identification of cores7.1 Colour codingThe cores of all cables shall be identified by colours in accordance with Table 2.The colour shall be applied either throughout the insulation or on its externalsurface.Where surface colouring is appli

49、ed, the surface colour shall be of essentially thesame material as the underlying material and shall be applied as part of theextrusion process. The surface colour shall be inseparable from the underlyingmaterial.7.2 Clarity and durabilityThe colours used for core identification shall be clearly identifiable. When thecore is lightly rubbed ten times with a piece of cotton wool soaked in water,there shall be no degradation of the colour.8 Laying up8.1 Multicore cablesThe cores