BS 7870-3 22-2011 LV and MV polymeric insulated cables for use by distribution and generation utilities Specification for distribution cables of rated voltage 0 6 1 kV XLPE insulat.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7870-3.22:2011Incorporating Corrigendum No. 1LV and MV polymericinsulated cables for use bydistribution and generationutilitiesPart 3: Specification for distributioncables of

2、rated voltage 0.6/1 kVSection 3.22: XLPE insulated splitconcentric cables with copper oraluminium conductors, having lowemission of smoke and corrosivegases when affected by fire(Implementation of HD 603)Publishing and copyright informationThe BSI copyright notice displayed in this document indicate

3、s when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 78837 6ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 11/30214065 DCPublication historyFirst p

4、ublished December 2011Amendments issued since publicationDate Text affectedAugust 2012 See forewordBS 7870-3.22:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Voltage designation 24 Phase conductors 25 Insulation 26 Assembly of cores 27 Bedding for 3-phase cables 28 Conce

5、ntric layer 29 Binder tapes 310 Oversheath 311 Marking 412 End sealing 513 Dimensions 514 Tests 815 Routine tests 916 Sample tests 917 Type tests 11AnnexesAnnex A (informative) Guide to selection and use of cables 13Annex B (normative) Test for shrinkage of oversheath on cable 14Bibliography 15List

6、of tablesTable 1 Cables with single phase copper conductor and split concentric copperneutral/earth conductors 6Table 2 Cables with single phase aluminium conductor and split concentriccopper neutral/earth conductors 6Table 3 Cables with 3-phase copper conductors and split concentric copperneutral/e

7、arth conductors 7Table 4 Cables with 3-phase aluminium conductors and split concentric copperneutral/earth conductors 7Table 5 Schedule of tests 8Table 6 Requirements for compatibility of insulation and oversheath 12Table A.1 Guide to use 13Summary of pagesThis document comprises a front cover, an i

8、nside front cover, pages i to iv,pages 1 to 16, an inside back cover and a back cover.BRITISH STANDARD BS 7870-3.22:2011 The British Standards Institution 2012 iForewordPublishing informationThis section of BS 7870 is published by BSI Standards Limited, under licence fromThe British Standards Instit

9、ution, and came into effect on 31 December 2011. Itwas prepared by Subcommittee GEL/20/16, Medium/High voltage cables, underthe authority of Technical Committee GEL/20, Electric cables. A list oforganizations represented on these committees can be obtained on request totheir secretary.Relationship w

10、ith other publicationsBS 7870 implements the nationally applicable parts of Harmonization DocumentsHD 603, 605, 620, 626 and 627 published by the European Committee forElectrotechnical Standardization (CENELEC) in accordance with the decision ofthe CENELEC Technical Board.BS 7870 applies to cables f

11、or fixed installations having a rated voltage U0/U upto and including 19/33 kV, and is published as a series of separate parts andsections, as listed in the table in the foreword of BS 7870-1.This new section of the standard, BS 7870-3.22, specifies a range of XLPEinsulated split concentric service

12、cables having low emission of smoke andcorrosive gases when affected by fire; it implements Part 5S of HD 603 S1 A2,and is to be read in conjunction with BS 7870-1 and BS 7870-2.Information about this documentThe start and finish of text introduced or altered by Corrigendum No. 1 isindicated in the

13、text by tagsand.A general guide to use for the types of cable specified in BS 7870 is given inBS 7870-1 and specific details for the types of cable specified in this section ofBS 7870 are given in Annex A.Hazard warningsWARNING. This British Standard calls for the use of substances and/orprocedures

14、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 stage.Use of this documentIt has been assumed in the preparation of this British Standard that theexe

15、cution 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. Itsrequirements are expressed in sentences in which the principal auxi

16、liary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 7870-3.22:2011ii The British Standards Institution 2012Contractual and legal considerationsThis publication does not purpor

17、t to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7870-3.22:2011 The British Standards Institution 2012 iiiBRITISH STANDARDBS 7870-3.22:2011This

18、 page deliberately left blankiv The British Standards Institution 20121 ScopeThis section of BS 7870 specifies requirements for the construction, dimensionsand mechanical and electrical properties of split concentric service cables havinga rated voltage of 0.6/1(1.2) kV. It is applicable to cables t

19、hat, when assessed bythe specified tests, produce lower levels of smoke and corrosive gases underexposure to fire than cables conforming to BS 7870-3.21.It specifies requirements for the following types of cable:a) single phase or 3-phase;b) stranded copper or solid aluminium conductors;c) XLPE insu

20、lation and PVC oversheath.This section of BS 7870 is applicable to cables that are designed for a maximumcontinuous conductor operating temperature of 90 C and for a maximum shortcircuit conductor temperature of 250 C.2 Normative referencesThe following referenced documents are indispensable for the

21、 application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 3988:1970+A3:1989, Specification for wrought aluminium for electricalpurposes Solid conductors for insulated c

22、ablesBS 7870-1, LV and MV polymeric insulated cables for use by distribution andgeneration utilities Part 1: GeneralBS 7870-2, LV and MV polymeric insulated cables for use by distribution andgeneration utilities Part 2: Methods of testBS EN 50267-2-1, Common test methods for cables under fire condit

23、ions Testson gases evolved during combustion of materials from cables Part 2-1: Procedures Determination of the amount of halogen acid gasBS EN 60228, Specification for conductors in insulated cables and cordsBS EN 60332-1-2:2004, Tests on electric and optical fibre cables under fireconditions Part

24、1-2: Test for vertical flame propagation for a single insulatedwire or cable Procedure for 1 kW pre-mixed flameBS EN 60332-3-24:2009, Tests on electric and optical fibre cables under fireconditions Part 3-24: Test for vertical flame spread of vertically-mountedbunched wires or cables Category CBS EN

25、 60811-1-1, Insulating and sheathing materials of electric and opticalcables Common test methods Part 1-1: General application Measurement ofthickness and overall dimensions Tests for determining the mechanicalpropertiesBS EN 60811-1-2, Insulating and sheathing materials of electric cables Commontes

26、t methods Part 1-2: General application Thermal ageing methodsBS EN 60811-1-3, Insulating and sheathing materials of electric cables Commontest methods Part 1-3: General application Methods for determining thedensity Water absorption tests Shrinkage testBS EN 61034-1, Measurement of smoke density of

27、 cables burning under definedconditions Part 1: ApparatusBS EN 61034-2, Measurement of smoke density of cables burning under definedconditions Part 2: Test procedure and requirementsBRITISH STANDARD BS 7870-3.22:2011 The British Standards Institution 2012 13 Voltage designationCables shall be design

28、ated by the voltages U0, U and Um, expressed in the formU0/U (Um).The voltage designation of cables in this standard shall be 0.6/1(1.2) kV.The rated voltage of the cable shall be at least equal to the nominal voltage ofthe system for which it is intended.4 Phase conductorsThe phase conductors shall

29、 be either stranded (class 2) plain annealed copper orsolid (class 1) aluminium conductors in accordance with BS EN 60228. Class 1conductors shall also conform to the dimensional requirements specified inBS 3988:1970+A3, 2.4.1.Conformity shall be checked by visual examination and, in the case of cla

30、ss 1conductors, by measurement, as specified in 16.2.The d.c. resistance shall conform to the relevant value given in Table 1 toTable 4, as applicable.Conformity shall be checked by the test method specified in 15.2.5 InsulationThe insulation shall be XLPE compound type DIX 3, conforming to therequi

31、rements given in BS 7870-1, Annex B.The insulation shall be applied by extrusion and shall form a compact andhomogeneous layer.The thickness of the insulation shall be in accordance with the relevant valuesspecified in Table 1 to Table 4, as applicable.Conformity shall be checked by the test methods

32、 specified in 16.4.The cores of all cables shall be identified by colours, as follows:a) single-core: brown;b) 3-core: brown, black and grey.6 Assembly of coresThe cores of 3-phase cables shall be laid up with a right-hand direction of layand a minimum lay length of 550 mm.NOTE Where necessary, fill

33、ers of suitable synthetic material may be used.7 Bedding for 3-phase cablesA synthetic tape bedding, having an approximate total thickness of 0.5 mm,shall be applied over the laid-up cores of 3-phase cables.8 Concentric layer8.1 Neutral conductorThe neutral conductor shall be manufactured from plain

34、 annealed copper wires.BRITISH STANDARDBS 7870-3.22:20112 The British Standards Institution 2012The d.c. resistance shall conform to the relevant value given in Table 1 toTable 4, as applicable.Conformity shall be checked by the test method specified in 15.2.To distinguish the neutral conductor from

35、 the earth continuity conductor, eachwire shall be covered by extrusion with a blue polymeric compound, conformingto the requirements of 17.4, to a diameter approximately the same as that ofthe individual wires in the earth continuity conductor.The lay length shall not exceed the relevant value give

36、n in Table 1 to Table 4, asapplicable, by more than 50%.Conformity shall be checked by visual examination and measurement asspecified in 16.3.NOTE The covering should not be regarded as insulation.8.2 Earth continuity conductorThe earth continuity conductor shall be manufactured from bare plain anne

37、aledcopper wires.Conformity shall be checked by visual examination as specified in 16.3.The d.c. resistance shall conform to the relevant value given in Table 1 toTable 4, as applicable.Conformity shall be checked by the test method specified in 15.2.8.3 Non-hygroscopic string separatorsThe non-hygr

38、oscopic string separators shall be approximately the same diameteras the individual bare wires forming the earth continuity conductor.Conformity shall be checked by visual examination as specified in 16.3.8.4 Application of concentric layerThe concentric layer shall be applied with a right-hand dire

39、ction of lay. Thewires forming the neutral conductor and the earth continuity conductor shall beapplied in individual groups over the insulation with non-hygroscopic stringseparators.Either one or two non-hygroscopic string separator(s) shall be located on eitherside of the group of bare copper wire

40、s to separate it from the group of coveredwires.The length of lay and number of strings shall be such that coverage ofapproximately 90% is achieved.Conformity shall be checked by visual examination as specified in 16.3.NOTE Examples of concentric conductor construction are given in Table 1 toTable 4

41、.9 Binder tapesOne or more overlapped synthetic binder tape(s) shall be applied immediatelyover the concentric layer.10 OversheathThe oversheath shall be an extruded layer of compound type DMZ 4,conforming to the requirements given in BS 7870-1, Annex B.BRITISH STANDARD BS 7870-3.22:2011 The British

42、 Standards Institution 2012 3NOTE Oversheaths are normally orange but colours other than orange may beprovided by agreement between the manufacturer and the purchaser, subject totheir suitability for the particular conditions under which the cables are to be used.The thickness of the oversheath shal

43、l conform to the relevant value specified inTable 1 to Table 4, as applicable.Conformity shall be checked by the test methods specified in 16.5.11 Marking11.1 External markingThe external surface of the cable shall be legibly marked with the followingelements:Element Example of markinga) Cable manuf

44、acturer Manufacturers name and their uniquefactory identifierNOTE 1 A simplified version of the manufacturers name, or trading name of themanufacturer, may be used in place of the full name.NOTE 2 Any suitable method may be used to unambiguously identify themanufacturers factory.NOTE 3 The manufactu

45、rers own trademark or equivalent may be added but thiscannot be used instead of the manufacturers name and identifier.b) Electric cable ELECTRIC CABLEc) Voltage designation 600/1 000 Vd) British Standard number BS 7870-3.221)e) Number of cores, type and nominalarea of phase conductors, e.g.:3-core c

46、able with 25 mm2aluminium phase conductors325ALsingle-core cable with a 25 mm2copper phase conductor125f) Year of manufacture YYYYNOTE 4 The year of manufacture may take the form of the actual year (e.g. 2011)or a coded year identifier assigned by the manufacturer.The marking of elements a) to f) sh

47、all be by embossing or by indenting on theoversheath.For cables with overall diameters greater than 15 mm, as given in Table 1 toTable 4, elements b), c) and d) shall appear, in any sequence that is deemedneither to confuse nor to conflict, on two or more primary lines along the axisof the cable, ap

48、proximately equally spaced around the circumference of thecable. Elements a), e) and f) shall appear, together or separately, in anysequence that is deemed neither to confuse nor to conflict, either on one of theprimary lines, or on a secondary line or lines.1)Marking BS 7870-3.22 on or in relation

49、to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on behalf of the manufacturer that theproduct meets the requirements of the standard. The accuracy of the claim is solelythe claimants responsibility. Such a declaration is not to be confused with third-partycertification of conformity.BRITISH STANDARDBS 7870-3.22:20114 The British Standards Institution 2012For cables with overall diameters of 15 mm or less, as given in Table 1 toTable 4, the elements shall