1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7870-3.50:2011Incorporating Corrigendum No. 1LV and MV polymericinsulated cables for use bydistribution and generationutilitiesPart 3: Specification for distributioncables of
2、rated voltage 0.6/1 kVSection 3.50: XLPE insulated, copperwire waveform or helical concentriccables with solid aluminiumconductors, having low emission ofsmoke and corrosive gases whenaffected by fire(Implementation of HD 603)Publishing and copyright informationThe BSI copyright notice displayed in
3、this document indicates when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 78839 0ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 11/30214071 DCPubl
4、ication historyFirst published October 2005Second (present) edition, December 2011Amendments issued since publicationDate Text affectedAugust 2012 See forewordBS 7870-3.50:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Voltage designation 24 Core conductors 25 Insulation
5、26 Assembly of cores 27 Concentric conductor 28 Oversheath 39 Marking 410 End sealing 511 Dimensions 512 Tests 713 Routine tests 814 Sample tests 815 Type tests 10AnnexesAnnex A (informative) Guide to selection and use of cables 12Annex B (normative) Test for shrinkage of oversheath on cable 13Bibli
6、ography 14List of tablesTable 1 3-core, 3-phase cables 6Table 2 4-core, 3-phase cables 6Table 3 Schedule of tests 7Table 4 Requirements for compatibility of insulation, oversheath and beddinglayer 10Table A.1 Guide to use 12Summary of pagesThis document comprises a front cover, an inside front cover
7、, pages i to iv,pages 1 to 14, an inside back cover and a back cover.BRITISH STANDARD BS 7870-3.50:2011 The British Standards Institution 2012 iForewordPublishing informationThis section of BS 7970 is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came i
8、nto 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.SupersessionThis section of BS
9、7870 supersedes BS 7870-3.50:2005, which is withdrawn.Relationship with other publicationsBS 7870 implements the nationally applicable parts of Harmonization DocumentsHD 603, 605, 620, 626 and 627 published by the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 th
10、e decision ofthe CENELEC Technical Board.BS 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 7870-3.50 specifies a range of XLPE in
11、sulated, copper wire waveform orhelical concentric cables with solid aluminium conductors having low emission ofsmoke and corrosive gases when affected by fire. It implements Part 5R ofHD 603 S1 A2 and is to be read in conjunction with BS 7870-1 and BS 7870-2.Information about this documentThis is a
12、 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 general guide to use for the types of cable specified in BS 7870 is given
13、 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 injurious to health if adequate precautions are nottaken. It refers only to tec
14、hnical 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 qualified andexperienced people
15、, 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 informative material is presented
16、insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 7870-3.50:2011ii The British Standards Institution 2012Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its corre
17、ct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7870-3.50:2011 The British Standards Institution 2012 iiiBRITISH STANDARDBS 7870-3.50:2011This page deliberately left blankiv The British Standards Institution 20121 ScopeThis section o
18、f BS 7870 specifies requirements for the construction, dimensionsand mechanical and electrical properties of XLPE insulated, concentric copperwire screened waveform or helical cables with solid aluminium core conductorshaving a rated voltage of 0.6/1(1.2) kV. It is applicable to cables that, whenass
19、essed by the specified tests, produce lower levels of smoke and corrosivegases under exposure to fire than cables conforming to BS 7870-3.11 or toBS 7870-3.40.It specifies requirements for the following types of cable: 3-core, 3-phase, with XLPE insulation, a concentric neutral/earth conductorof cop
20、per wires on a synthetic bedding and a thermoplastic oversheath; 4-core, 3-phase and a separate neutral, with XLPE insulation, a concentricearth conductor of copper wires on a synthetic bedding, and athermoplastic oversheath.This section of BS 7870 is applicable to cables that are designed for a max
21、imumcontinuous conductor operating temperature of 80 C and for a maximum 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 undatedrefere
22、nces, 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 cablesBS 7870-1, LV and MV polymeric insulated cables for use by distribution andgeneration utilities
23、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 conditions Testson gases evolved during combustion of materials from cables Part 2-1: Procedures Determinat
24、ion 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 1-2: Test for vertical flame propagation for a single insulatedwire or cable Procedure for 1 kW pre-m
25、ixed 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 60811-1-2, Common test methods for insulating and sheathing materialsof electric and optical cables
26、Part 1-2: General application Thermal ageingmethodsBS EN 60811-1-3, Insulating and sheathing materials of electric and opticalcables. Common test methods Part 1-3: General application Methods fordetermining the density Water absorption tests Shrinkage testBS EN 61034-1, Measurement of smoke density
27、of 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 7870-3.50:2011 The British Standards Institution 2012 13 Voltage designationCables shall be desi
28、gnated 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 Core conductorsThe core conductors shal
29、l be shaped solid aluminium in accordance with Table 1or Table 2, as applicable, and shall conform to the requirements for solidconductors (class 1) as specified in BS EN 60228. The conductors shall alsoconform to the dimensional requirements specified in BS 3988:1970+A3, 2.4.2.Conformity shall be c
30、hecked by visual examination and measurement asspecified in 14.2.The d.c. resistance shall conform to the relevant value given in Table 1 orTable 2, as applicable.Conformity shall be checked by the test method specified in 13.2.5 InsulationThe insulation of the core conductors specified in Clause 4
31、shall be XLPE typeDIX 3 conforming to the requirements 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 or Table 2, as applicable.
32、Conformity shall be checked by the test methods specified in 14.3.The cores of all cables shall be identified by colours as follows:a) 3-core: brown, black, grey;b) 4-core: brown, black, grey, blue.6 Assembly of coresThe cores shall be laid up with a right-hand direction of lay, in the sequencespeci
33、fied in Clause 5.The minimum lay length of the cores shall be as specified in Table 1 or Table 2,as applicable.NOTE Suitable binder tapes may be applied to form a compact assembly.7 Concentric conductor7.1 MaterialThe concentric conductor shall consist of plain annealed copper wires.NOTE In order to
34、 maintain the waveform during manufacture, the copper wirestypically need to be annealed to a level to achieve greater than 18% elongation atbreak.BRITISH STANDARDBS 7870-3.50:20112 The British Standards Institution 20127.2 ApplicationThe wires shall be applied concentrically with either a helical o
35、r a waveform lay.In the case of a waveform lay, the lay length shall be as specified in Table 1 orTable 2, as applicable.In the case of a helical lay, the wires shall be applied with a left-hand directionof lay. The lay length shall be approximately 15 times the pitch circle diameterformed by the wi
36、res.The mean gap between adjacent wires shall not exceed 4 mm and at any pointthe gap shall not exceed 8 mm.Where the wires are applied in a waveform lay the developed length of eachwire in the waveform wavelength shall be at least 106%.Conformity shall be checked by visual examination and measureme
37、nt asspecified in 14.5.The d.c. resistance of the concentric conductor shall conform to the relevantvalue given in Table 1 or Table 2, as applicable.Conformity shall be checked by the test method specified in 13.2.NOTE 1 Examples of waveform concentric conductor construction are given inTable 1 and
38、Table 2.NOTE 2 One or more overlapped synthetic binder tapes may be appliedimmediately over the concentric layer.7.3 Bedding layerThe copper wires shall be bedded on an extruded or taped layer of syntheticmaterial.Conformity shall be checked as specified in 14.4.1.The bedding layer shall be compatib
39、le with the insulation and the oversheath.Conformity shall be checked by the test method specified in 15.8.The material shall be easily removable.If the bedding layer is extruded, conformity shall be checked as specifiedin 14.4.2.8 OversheathThe oversheath shall be an extruded layer of compound type
40、 DMZ 4,conforming to the requirements given in BS 7870-1, Annex B. Unless otherwiseagreed between the manufacturer and the purchaser, the oversheath shall becoloured orange.NOTE Colours other than orange may be provided by agreement between themanufacturer and the purchaser, subject to their suitabi
41、lity for the particularconditions under which the cables are to be used.The thickness of the oversheath shall conform to the relevant values specified inTable 1 or Table 2, as applicable.Conformity shall be checked by the test methods specified in 14.6.BRITISH STANDARD BS 7870-3.50:2011 The British
42、Standards Institution 2012 39 Marking9.1 External markingThe external 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
43、 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 manufacturers own trademark or equivalent may be added but thiscannot be used instead of the manufacturers name and identifier.
44、b) Electric cable ELECTRIC CABLEc) Voltage designation 600/1000 Vd) British Standard number BS 7870-3.501)e) Number of cores, type andnominal area of core conductors, andform of concentric conductor e.g.:3-core cable with 95 mm2aluminium core conductorshaving a copper waveformconcentric neutral/eart
45、hconductor3 95 AL(W)4-core cable with 185 mm2aluminium core conductorshaving a copper helicalconcentric earth conductor4 185 AL(H)f) 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 mark
46、ing of elements a) to f) shall be by embossing or by indenting on theoversheath.Elements b), c) and d) shall appear, in any sequence that is deemed neither toconfuse nor to conflict, on two or more primary lines along the axis of thecable, approximately equally spaced around the circumference of the
47、 cable.Elements a), e) and f) shall appear, together or separately, in any sequence thatis deemed neither to confuse nor to conflict, either on one of the primary lines,or on a secondary line or lines.The letters and figures shall consist of upright block characters. The charactersshall have a minim
48、um height of 3 mm.1)Marking BS 7870-3.50 on or in relation 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
49、a declaration is not to be confused with third-partycertification of conformity.BRITISH STANDARDBS 7870-3.50:20114 The British Standards Institution 2012The distance between 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 13.5.9.2 Mark of an approval organizationIf the mark of
