1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7870-3.11:2011Incorporating Corrigendum No. 1LV and MV polymericinsulated cables for use bydistribution and generationutilitiesPart 3: Specification for distributioncables of
2、rated voltage 0.6/1 kVSection 3.11: XLPE insulatedcombined neutral and earth copperwire concentric cables with copperor aluminium conductors(Implementation of HD 603)Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. Th
3、e British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 78834 5ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 11/30214059 DCPublication historyFirst published August 2001Second (present) e
4、dition, December 2011Amendments issued since publicationDate Text affectedAugust 2012 See forewordBS 7870-3.11:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Voltage designation 14 Phase conductors 15 Insulation 26 Assembly of cores 27 Bedding for 3-phase cables 28 Concen
5、tric neutral/earth conductor 29 Oversheath 310 Marking 311 End sealing 412 Dimensions 413 Tests 714 Routine tests 815 Sample tests 816 Type tests 9AnnexesAnnex A (informative) Guide to selection and use of cables 11Bibliography 12List of tablesTable 1 Cables with single phase copper conductor and he
6、lical concentriccopper neutral/earth conductor 5Table 2 Cables with single phase aluminium conductor and helical concentriccopper neutral/earth conductor 5Table 3 Cables with 3-phase copper conductors and helical concentric copperneutral/earth conductor 6Table 4 Cables with 3-phase aluminium conduct
7、ors and helical concentriccopper neutral/earth conductor 6Table 5 Schedule of tests 7Table 6 Requirements for compatibility of insulation and oversheath 10Table A.1 Guide to use 11Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 12, an inside bac
8、k cover and a back cover.BRITISH STANDARD BS 7870-3.11:2011 The British Standards Institution 2012 iForewordPublishing informationThis section of BS 7870 is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 December 2011. Itwas prepar
9、ed 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.SupersessionThis section of BS 7870 supersedes BS 7870-3.11:2001, which is
10、withdrawn.Relationship with 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
11、7870 applies to cables for 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.BS 7870-3.11 specifies a range of XLPE insulated combined neutral/earth (CNE)service
12、 cables; it implements Part 5S of HD 603 S1 A3, and is to be read inconjunction with BS 7870-1 and BS 7870-2.BS 7870-3.10 specifies a similar range of CNE cables having PVC insulation.BS 7870-3.12 specifies a similar range of CNE cables which have XLPE insulationand low emission of smoke and corrosi
13、ve gases when affected by fire.Information about this documentThis is a full revision of the standard, and brings the standard up to date inaccordance with current practice in the industry.The start and finish of text introduced or altered by Corrigendum No. 1 isindicated in the text by tagsand.A ge
14、neral 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 that can be injuriou
15、s 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 theexecution of its provis
16、ions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.BRITISH STANDARDBS 7870-3.11:2011ii The British Standards Institution 2012Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements
17、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 does not purport to include all the
18、 necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7870-3.11:2011 The British Standards Institution 2012 iiiBRITISH STANDARDBS 7870-3.11:2011This page deliberately l
19、eft blankiv The British Standards Institution 20121 ScopeThis section of BS 7870 specifies requirements for the construction, dimensionsand mechanical and electrical properties of concentric copper wire combinedneutral/earth (CNE) service cables having a rated voltage of 0.6/1(1.2) kV.It specifies r
20、equirements for the following types of cable:a) single phase or 3-phase;b) stranded copper or solid aluminium conductors;c) XLPE insulation 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 m
21、aximum shortcircuit conductor temperature of 250 C.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 any
22、amendments) applies.BS 3988:1970+A3:1989, Specification for wrought aluminium for electricalpurposes Solid conductors for insulated cablesBS 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
23、 use by distribution andgeneration utilities Part 2: Methods of testBS 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 1-2: Test for vertical flame propagation for a single insulatedwire or
24、 cable Procedure for 1 kW pre-mixed flameBS EN 60811-1-2, Common test methods for insulating and sheathing materialsof electric and optical cables Part 1-2: General application Thermal ageingmethodsBS EN 60811-1-3, Insulating and sheathing materials of electric and opticalcables Common test methods
25、Part 1-3: General application Methods fordetermining the density Water absorption tests Shrinkage test3 Voltage designationCables shall be designated 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 volta
26、ge 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 be either stranded (class 2) plain annealed copper orsolid (class 1) aluminium conductors in accordance with BS EN 60228. Class 1conductors shall also con
27、form to the dimensional requirements specified inBS 3988:1970+A3, 2.4.1.BRITISH STANDARD BS 7870-3.11:2011 The British Standards Institution 2012 1Conformity shall be checked by visual examination and, in the case of class 1conductors, by measurement, as specified in 15.2.The d.c. resistance shall c
28、onform to the relevant value given in Table 1 toTable 4, as applicable.Conformity shall be checked by the test method specified in 14.2.5 InsulationThe insulation shall be XLPE compound type DIX 3, conforming to therequirements given in BS 7870-1, Annex B.The insulation shall be applied by extrusion
29、 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 method specified in 15.4.The cores of all cables shall be identified by colours, as fol
30、lows: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, fillers of suitable synthetic material may be used.7 Bedding for 3-phase cablesA PVC
31、or synthetic tape bedding, having an approximate total thickness of0.5 mm, shall be applied over the laid-up cores of 3-phase cables.NOTE At the discretion of the manufacturer a polyester separation tape may beapplied between the laid-up cores and the PVC tape as part of the bedding.8 Concentric neu
32、tral/earth conductorThe neutral/earth conductor shall consist of a single layer of plain annealedcopper wires applied with either a right- or left-hand direction of lay or analternating right- and left-hand direction of lay.The gap between adjacent wires shall not exceed 4 mm.The lay length shall no
33、t exceed the relevant value given in Table 1 to Table 4, asapplicable, by more than 50%.Conformity shall be checked by visual examination and measurement asspecified in 15.3.The d.c. resistance shall conform to the relevant value given in Table 1 toTable 4, as applicable.Conformity shall be checked
34、by the test method specified in 14.2.NOTE 1 Examples of concentric conductor construction are given in Table 1 toTable 4.NOTE 2 One or more overlapped synthetic binder tapes may be appliedimmediately over the concentric conductor layer.BRITISH STANDARDBS 7870-3.11:20112 The British Standards Institu
35、tion 20129 OversheathThe oversheath shall be an extruded layer of PVC compound type DMV 23conforming to the requirements given in BS 7870-1, Annex B.NOTE Oversheaths are normally black but colours other than black may beprovided by agreement between the manufacturer and the purchaser, subject tothei
36、r suitability for the particular conditions under which the cables are to be used.The thickness of the oversheath shall conform to the relevant values specified inTable 1 to Table 4, as applicable.Conformity shall be checked by the test method specified in 15.5.10 Marking10.1 External markingThe ext
37、ernal surface of the cable shall be legibly marked with the followingelements.Element Example of markinga) Cable manufacturer 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 fu
38、ll name.NOTE 2 Any suitable method may be used to unambiguously identify themanufacturers factory.NOTE 3 The manufacturers 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
39、 Vd) British Standard number BS 7870-3.111)e) Number of cores, type and nominalarea of phase conductors, e.g.:3-core cable with 25 mm2aluminium phase conductors325ALsingle-core cable with a 25 mmcopper phase conductor125f) Year of manufacture YYYYNOTE 4 The year of manufacture may take the form of t
40、he actual year (e.g. 2011)or a coded year identifier assigned by the manufacturer.The marking of elements a) to f) shall be by embossing or by indenting on theoversheath.1)Marking BS 7870-3.11 on or in relation to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on b
41、ehalf 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 STANDARD BS 7870-3.11:2011 The British Standards Institution
42、 2012 3For 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, approximately equally spaced around the circumfe
43、rence 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.For cables with overall diameters of 15 mm or less, as given in Table 1 toTable 4, the
44、elements shall be arranged as for cables of greater than 15 mmdiameter, except that the marking of elements b), c) and d) shall appear on oneor more primary lines.The letters and figures shall consist of upright block characters. The charactersshall have a minimum height of 3 mm.The distance between
45、 the end of one element of marking and the beginning ofthe next identical element shall be not greater than 550 mm for elements b), c)and d), and not greater than 1 100 mm for elements a), e) and f).Conformity shall be checked by visual examination and measurement asspecified in 14.5.10.2 Mark of an
46、 approval organizationIf the mark of an approval organization is used, it shall be provided throughoutthe length of the cable, either as an identification thread or by marking on theexternal surface of the cable, as specified by the approval organization.If the mark is on the external surface of the
47、 cable, it shall be in the form of thesymbol(s) specified by the approval organization, and the distance between theend of one element of marking and the beginning of the next identical elementshall be not greater than 1 100 mm.Conformity shall be checked by visual examination and measurement asspec
48、ified in 14.5.10.3 Additional markingWhere additional marking is made, it shall be throughout the length of thecable, and on the external surface of the cable, or by means of a tape or threadwithin the cable, or by a combination of these methods. If the additionalmarking is applied to the surface of
49、 the cable it shall not render illegible themarking specified in 10.1 and 10.2.The additional marking, however made, shall be repeated at intervals notexceeding 1 100 mm.Conformity shall be checked by visual examination and measurement asspecified in 14.5.11 End sealingBefore dispatch, the manufacturer shall cap the ends of all cables in order toform a seal to prevent the ingress of water during transportation and storage.12 DimensionsThe thickness of each component layer shall be as specified in Table 1 to Table 4,a
