1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7889:2012Electric cables Thermosetting insulated,non-armoured cables with avoltage of 600/1 000 V, forfixed installationsPublishing and copyright informationThe BSI copyright
2、notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 74987 2ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/17Draft for commen
3、t 12/30244369 DCPublication historyFirst published, October 1997Second (present) edition, October 2012Amendments issued since publicationDate Text affectedBS 7889:2012 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Rated voltage 35 Conductors 36 Insula
4、tion 37 Identification of cores 48 Laying up 59 Extruded optional inner covering 510 Sheath 611 Cable marking and additional information 612 Schedule of tests 813 Test conditions 914 Routine tests 1015 Sample tests 1016 Type tests 11AnnexesAnnex A (informative) Guide to use 16Annex B (normative) Com
5、patibility test 19Annex C (normative) Abrasion test 20Annex D (informative) Notes on type tests 21Annex E (normative) Green-and-yellow measurement for shaped conductors 22Bibliography 24List of figuresFigure1Anexample of the marking as used on the outer sheath of thecable 7Figure E.1 Measurement of
6、green-and-yellow for shaped conductors 23List of tablesTable 1 Schedule of tests 9Table 2 Single-core 600/1 000 V cables with circular stranded copperconductor 12Table3Two-core 600/1 000 V cables with stranded copper conductors 13Table 4 Three-core 600/1 000 V cables with stranded copper conductors
7、14Table 5 Four-core 600/1 000 V cables with stranded copper conductors 15Table 6 Five-core 600/1 000 V cables with stranded copper conductors 15Table A.1 Minimum installation radius 18Table B.1 Compatibility requirements 20Table C.1 Vertical load requirements 20Summary of pagesThis document comprise
8、s a front cover, an inside front cover, pages i to iv,pages 1 to 24, an inside back cover and a back cover.BRITISH STANDARD BS 7889:2012 The British Standards Institution 2012 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British St
9、andards Institution, and came into effect on 31 October 2012. Itwas prepared by Subcommittee GEL/20/17, Low voltage cables, under theauthority of Technical Committee GEL/20, Electric cables. A list of organizationsrepresented on these committees can be obtained on request to their secretary.Superses
10、sionThis British Standard supersedes BS 7889:1997, which is withdrawn.Relationship with other publicationsBS 7889 is related to but not equivalent to IEC 60502-1.Information about this documentThis is a full revision of the standard, and introduces the following principalchanges.a) The range of cabl
11、es specified is extended to include cables with two to fivecores.b) The marking arrangements are updated and clarified.c) Test methods are updated to reflect the latest CENELEC harmonization.The new edition takes account of: BS EN 60228 (replacing BS 6360) on conductors; BS EN 50363 (replacing certa
12、in parts of BS 7655) on materials; BS EN 50395 (replacing Annex E of BS 7889:1997) on electrical tests; BS EN 50396 (replacing Annex D of BS 7889:1997) on thicknessmeasurement; BS EN 60332-1-2 (replacing BS EN 50265-2-1); BS EN 62230 (replacing BS EN 50356) on spark testing; IEC 60050-461 (replacing
13、 BS 4727-2-08).In the preparation of BS 7889, GEL/20/17 has requested that references to otherstandards for which the committee is responsible are undated, even if referringto a specific clause. It is the committees intention not to amend thefundamentals (e.g. clause numbers, material type designati
14、on) in any of thesestandards and so the latest edition applies.Product certification/inspection/testing. Users of this British Standard are advisedto consider the desirability of third-party certification/inspection/ testing ofproduct conformity with this British Standard. Users seeking assistance i
15、nidentifying appropriate conformity assessment bodies or schemes may ask BSI toforward their enquiries to the relevant association.WARNING. 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 t
16、echnical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.BRITISH STANDARDBS 7889:2012ii The British Standards Institution 2012Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequiremen
17、ts 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
18、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 7889:2012 The British Standards Institution 2012 iiiBRITISH STANDARDBS 7889:2012This page deliberately left bla
19、nkiv The British Standards Institution 20121 ScopeThis British Standard specifies requirements and test methods for theconstruction and performance of non-armoured cables with thermosettinginsulation of rated voltages 600/1 000 V. Cables specified in this British Standardare intended for use in fixe
20、d installations in industrial areas, buildings andsimilar applications but not for burial in the ground, either directly or in ducts.The cables specified in the standard are all stranded copper conductor,thermosetting insulated, PVC sheathed types. There are single-core types, andmulti-core types (2
21、-, 3-, 4- and 5-core).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 periodof 5 s).NOTE 1 Limitation on the temperature of the cables m
22、ay be imposed in situationswhere they could be touched, or where they could touch other materials.NOTE 2 In installations that include wiring accessories, junction boxes andconsumer units, etc., the performance of these accessories should be taken intoaccount in deciding the maximum operating temper
23、ature of the cable.NOTE 3 Annex A gives guidance on the use of these cables, Annex B gives thecompatibility test, Annex C gives the abrasion test, Annex D gives notes on type testsand Annex E gives green-and-yellow measurement for shaped conductors.2 Normative referencesThe following documents, in w
24、hole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 5099, Electric cables Voltage levels
25、for spark testingBS 7655-1.2, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insulating compounds Section 1.2: General90 C applicationBS 7655-1.3, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insula
26、ting compounds Section 1.3: XLPEBS 7655-4.2, Specification for insulating and sheathing materials for cables Part 4: PVC sheathing compounds Section 4.2: General applicationBS EN 50363-5, Insulating, sheathing and covering materials for low voltageenergy cables Part 5: Halogen-free, cross-linked ins
27、ulating compoundsBS EN 50395, Electrical test methods for low voltage energy cablesBS EN 50396, Non electrical test methods for low voltage energy cablesBS EN 60228, Conductors of insulated cablesBS EN 60229, Electric cables Tests on extruded oversheaths with a specialprotective functionBS EN 60332-
28、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 1kW pre-mixed flameBS EN 60811-401, Electric and optical fibre cables Test methods fornon-metallic materials Part 401: Miscellaneo
29、us tests Thermal ageingmethods Ageing in an air ovenBRITISH STANDARD BS 7889:2012 The British Standards Institution 2012 1BS EN 60811-501, Electric and optical fibre cables Test methods fornon-metallic materials Part 501: Mechanical tests Tests for determining themechanical properties of insulating
30、and sheathing compoundsBS EN 60811-502, Electric and optical fibre cables Test methods fornon-metallic materials Part 502: Mechanical tests Shrinkage test forinsulationBS EN 62230, Electric cables Spark-test methodIEC 60050-461, International Electrotechnical Vocabulary Part 461: Electriccables3 Ter
31、ms and definitionsFor 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 British StandardNOTE See 11.1a) for informat
32、ion on marking the cable with the cablemanufacturers name and identifier.3.2 length of layaxial length of one complete turn of the helix formed by one cable component3.3 routine tests, Rtests made on all production cable lengths to demonstrate their integrity3.4 sample tests, Stests made on samples
33、of completed cable, or components taken from acompleted cable, adequate to verify that the product meets the designspecifications3.5 type tests, Ttests made before supplying, on a general commercial basis, a type of cablecovered by this British Standard, in order to demonstrate satisfactoryperforman
34、ce characteristics 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 materials, design or type ofmanufacturing process, which might change the performance characteristics.3.6 values3.6.1
35、 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 measurementstaking into account
36、 specified tolerances.BRITISH STANDARDBS 7889:20122 The British Standards Institution 20123.7 voltages3.7.1 maximum voltage, Ummaximum sustained power-frequency voltage between phase conductors forwhich the cable is suitable3.7.2 rated voltage, U0nominal power-frequency voltage between conductor(s)
37、and earth for which thecable is suitable3.7.3 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 recognized for the purposes of
38、 this standard shall be600/1 000 V.The maximum designated voltage (Um) for the purposes of this standard for600/1 000 V cable shall be 1 200 V.In an alternating current system, the rated voltage of the cable shall be at leastequal to the nominal voltage of the system for which it is intended.NOTE Gu
39、idance on the selection of cables of appropriate voltage designations forparticular systems is given in A.4.5 ConductorsThe conductors shall be annealed copper as given in Table 2 to Table 6 inclusive,and shall conform to the requirements of BS EN 60228, Class 2.NOTE The category of test for this re
40、quirement, and for all others in this standard,is shown in Table 1, “Schedule of tests”.6 Insulation6.1 Type of insulationThe insulation shall be type GP 8 conforming to BS 7655-1.3, or type GP 6conforming to BS 7655-1.2, or type EI 5 conforming to BS EN 50363-5.6.2 ApplicationThe insulation shall b
41、e applied by an extrusion process and cross-linked to forma compact and homogeneous layer.NOTE 1 The insulation can be applied in a single layer, or in a number of cohesivelayers.Where more than one layer is used, the complete insulation shall be tested asthough it were a single layer.NOTE 2 Insulat
42、ion applied in more than one layer does not conform to thedefinition of double insulation given, for instance, in BS 7671.The manufacturer shall have the option to apply a tape or tapes over theconductor or insulation. These tapes shall not be included as part of theinsulation.BRITISH STANDARD BS 78
43、89:2012 The British Standards Institution 2012 3It shall be possible to remove the insulation easily without damage to theinsulation itself or to the conductor.6.3 Thickness of insulationThe mean value of the radial thickness of the insulation, when measured inaccordance with BS EN 50396, 4.1, shall
44、 be not less than the value given inTable 2 to Table 6. The smallest value measured, tm, shall not fall below 90% ofthe value given in Table 2 to Table 6 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 millimetr
45、es (mm).7 Identification of cores7.1 GeneralThe cores of all cables shall be identified by colour. Colour coding shall be inaccordance with the following sequence.Number of cores IdentificationSingle-core Brown or blueTwo-core Brown, blueThree-core Brown, black, greyAlternatively, green-and-yellow,
46、blue, brownFour-core Blue, brown, black, greyAlternatively, green-and-yellow, brown, black, greyFive-core Green-and-yellow, blue, brown, black, greyNOTE Depending on their intended use, the cables might be subject to the corecolour requirements specified in BS 7671 or other standards, or in statutor
47、yrequirements.The colour shall be applied throughout either the insulation or the outercohesive layer, and shall be applied as part of the extrusion process.The insulation of the coloured cores, irrespective of the method of colouring,shall be tested as a complete single layer (see 6.2).Conformity s
48、hall be checked by visual examination.7.2 Bi-colour combinationOn the core marked with the bi-colour combination green-and-yellow, thedistribution of the colours shall be such that for every 15 mm length of core,one of these colours shall cover not less than 30% and at most 70% of thesurface of the
49、core, while the other colour shall cover the remainder of thesurface. Conformity shall be checked by measurement.NOTE 1 In the case of shaped cores one colour might be applied as one or morestripes, provided that both colours remain readily visible.NOTE 2 In cases of dispute, and where appropriate to the method of colourmarking of the insulation, a suitable test for checking conformity is given inBS EN 50396, 5.2 for circular cores, and in Annex E of this standard for shaped cores.BRITIS
