1、Electric cables Single core PVC insulated flexible cables of rated voltage 600/1000 V for switchgear and controlgear wiringICS 29.060.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDBS 6231:2006IncorporatingCorrigendum No. 1Publishing and copyright information
2、The BSI copyright notice displayed in this document indicates when the document was last issued.ISBN 0 580 48589 7The following BSI references relate to the work on this standard:Committee reference GEL/20/17Draft for comment 05/30138592 DCPublication historyFirst published, as BS 1231, July 1945Sec
3、ond edition, November 1958Third edition, February 1963Fourth edition, as BS 6231, August 1969Fifth edition, May 1978Sixth edition, December 1981Seventh edition, October 1990Eighth edition, August 1998Ninth edition, July 2006BS 6231:2006Amendments issued since publicationAmd. no. Date Text affected16
4、677Corrigendum No. 1September 2006 Change reference to 8.1 in 10.4 and Table A.1, change temperature to 90 C in Table 2 BSI 2006 BSI 2006 iBS 6231:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Voltage designation 25 Conductors 26 Insulation 27 Identification 38 C
5、able marking 39 Routine tests for finished cables 410 Sample tests for finished cables 411 Type tests for finished cables 5AnnexesAnnex A (normative) Schedule of tests 8Annex B (normative) Measurement of insulation thickness 9Annex C (normative) Test conditions 9Annex D (normative) Method of test fo
6、r voltage withstand 9Bibliography 10List of tablesTable 1 PVC insulated flexible cable - Type BK 6Table 2 PVC insulated flexible cable - Type CK 7Table A.1 Schedule of tests 8Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back c
7、over and a back cover.ii BSI 2006BS 6231:2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 15 July 2006. It was prepared by Subcommittee GEL/20/17, Low voltage cables, under the authority of Technical Committee GEL/20, Electric cables.Supersession T
8、his British Standard supersedes BS 6231:1998, which is withdrawn.Information about this documentThis new edition of BS 6231 retains requirements in respect of cable types BK and CK only. Requirements for other types have been withdrawn as they are no longer considered to be market relevant.The other
9、 principal changes introduced in this edition are to call up CENELEC harmonized test methods in place of earlier national methods.Product certification/inspection/testing Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of produc
10、t conformity with this British Standard. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association.WARNING. This British Standard calls for the use of procedures that can be injurious to health if ad
11、equate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are present
12、ed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal obligationsThis publication does not purport to include all the necessary p
13、rovisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2006 1BS 6231:20061 ScopeThis British Standard specifies construction and performance requirements, and gives methods of test, for single c
14、ore, non-sheathed electric cables of rated voltage 600/1000 V that have PVC insulation. The types of cable specified in this standard are as follows:Type BK - for a maximum conductor temperature of 70 C (see Table 1);Type CK - for a maximum conductor temperature of 90 C (see Table 2).These cables ar
15、e intended for use in the wiring of switch, control, metering, relay and instrument panels of power switchgear, and for such purposes as internal connections in rectifier equipment and its motor starters and controllers. They are intended for use at alternating voltages not exceeding 600 V to earth,
16、 and direct voltages not exceeding 1000 V to earth. When installed in the equipment they are suitable for wiring circuits for which the prescribed alternating test voltage does not exceed 4 kV r.m.s. for 1 min. A summary of the tests applicable to the cables is given in Annex A.2 Normative reference
17、sThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 4727-2: Group 08, Glossary of electrotechnical
18、, power, telecommunication, electronics, lighting and colour terms Part 2: Terms particular to power engineering Group 08: Electric cables.BS 5099, Electric cables Voltage levels for spark testing.BS EN 50356, Method for spark testing of cables.BS EN 50363-3, Insulating, sheathing and covering mater
19、ials for low voltage energy cables Part 3: PVC insulating compoundsBS EN 50395:2005, Electrical test methods for low voltage energy cablesBS EN 50396:2005, Non-electrical test methods for low voltage energy cablesBS EN 60228, Conductors of insulated cablesBS EN 60332-1-2, Tests on electric and optic
20、al fibre cables under fire conditions Part 1-2: Test for vertical flame propagation for a single insulated wire or cable Procedure for 1 kW pre-mixed flameBS EN 60811-1-1, Insulating and sheathing materials of electric cables Common test methods Part 1-1: General application Measurement of thickness
21、 and overall dimensions Tests for determining the mechanical properties.3 Terms and definitionsFor the purposes of this British Standard the definitions given in BS 4727-2: Group 08 apply, together with the following.3.1 rated voltage Unominal power-frequency voltage between phase conductors for whi
22、ch the cable is suitableBS 6231:20062 BSI 20063.2 rated voltage U0nominal power-frequency voltage between conductor(s) and earth for which the cable is suitable 3.3 approximate valuevalue which is only indicativeNOTE In this standard, values described as “approximate” do not constitute requirements
23、to be checked by measurement. 3.4 nominal valuevalue by which a quantity is designatedNOTE Nominal values usually give rise to values to be checked by measurements taking into account specified tolerances.4 Voltage designationCables shall be designated by the rated voltages U0and U, expressed in the
24、 form U0/U.NOTE The rated voltage recognized for the purpose of this British Standard is 600/1000 V.5 ConductorsThe conductors shall conform to BS EN 60228, class 5. The insulated conductors shall be circular, plain annealed copper.6 Insulation6.1 TypesThe insulation shall be type TI 1 as specified
25、in BS EN 50363-3 for cable type BK, and type TI 3 as specified in BS EN 50363-3 for cable type CK.6.2 ApplicationThe insulation shall be applied closely to the conductor by the extrusion process.When the application is tested by removing the insulation from the conductor, there shall be no damage to
26、 the insulation itself or the conductor.6.3 Thickness The radial thickness of the insulation, when determined by taking the average of a number of measurements in accordance with Annex B, shall be not less than the appropriate value given in Table 1 or Table 2, and the smallest of the measured value
27、s shall not fall below the value given in Table 1 or Table 2 by more than 10 % + 0.1 mm. BSI 2006 3BS 6231:20066.4 Spark testWhen tested at the manufacturers works in accordance with BS EN 50356, using either the a.c. or the d.c. method and the test voltages specified in BS 5099, there shall be no b
28、reakdown of the insulation.7 IdentificationAll cables shall be identified by colour in accordance with Tables 1 and 2. The colour shall be either throughout the insulation or on its external surface.Where the bi-colour combination green-and-yellow is used, the distribution of these colours shall be
29、such that for every 15 mm length of core, one of these colours shall cover at least 30 % and not more than 70 % of the surface of the core, while the other colour covers the remainder of the surface. Conformity shall be checked by measurement.NOTE 1 In cases of dispute regarding the green-and-yellow
30、 combination and where appropriate to the method of colour marking of the insulation, a suitable test method for checking conformity is given in BS EN 50396:2005, clause 5.2.NOTE 2 Attention is drawn to the fact that, according to the use to which cables are put, they could be subject to core colour
31、 requirements specified in BS 7671, in other British Standards or in other standards, or in regulations or statutory instruments. NOTE 3 In accordance with BS EN 60446, the single colours green and yellow are only permitted where a confusion with the colouring of the protective conductor is not like
32、ly to occur.The colour used for core identification shall be clearly identifiable. When the core is lightly rubbed ten times with a piece of cotton wool soaked in water, there shall be no degradation of the colour.8 Cable markingThe cable shall be marked with the number of this British Standard, i.e
33、. BS 62311), on the outer surface by printing, indenting or embossing. Type CK cables shall additionally be marked with the legend:HEAT RESISTING 90NOTE This additional marking may be combined with the marking of the indication of origin.All cables shall be provided with an indication of origin cons
34、isting of a continuous marking of the manufacturers name or trademark. The marking of the manufacturers name or trademark shall be by printing, indenting or embossing on the sheath.1)Marking BS 6231 or BS 6231:2006 on or in relation to a product represents a manufacturers declaration of conformity,
35、i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity.BS 6231:20064 BSI 2006Any marking shall be
36、 legible and regarded as continuous if the gap between the end of one complete inscription and the beginning of the next does not exceed 275 mm.Any marking by printing shall be durable. Conformity shall be checked by rubbing the marking lightly ten times with a piece of cotton wool or cloth soaked i
37、n water.9 Routine tests for finished cables9.1 GeneralRoutine tests shall be performed as identified in Table A.1. NOTE 1 The schedule of tests given in Annex A shows the category of each test parameter, and gives cross-references to the appropriate requirements and test methods.NOTE 2 Routine tests
38、 for components are covered in Clauses 5 to 7 and are identified in Table A.1.10 Sample tests for finished cables10.1 GeneralSample tests shall be performed as identified in Table A.1. The tests specified in this clause shall be performed under the test conditions specified in Annex C unless otherwi
39、se specified in the details for the particular test. NOTE 1 The schedule of tests given in Annex A shows the category of each test parameter, and gives cross-references to the appropriate requirements and test methods.NOTE 2 Sample tests for components are covered in Clauses 5 to 7 and are identifie
40、d in Table A.1.10.2 Conductor resistanceWhen measured in accordance with BS EN 60228 and corrected to 20 C, on a sample of cable not less than 1 m in length, the d.c. resistance of each conductor shall conform to the requirements specified in BS EN 60228.10.3 Voltage withstand of completed cableWhen
41、 a sample of completed cable is tested in accordance with Annex D, no breakdown of the insulation shall occur.10.4 Insulation resistanceWhen the cable is tested in accordance with BS EN 50395:2005, 8.1, the insulation resistance shall be not less than the minimum value specified in the appropriate c
42、onstruction table. BSI 2006 5BS 6231:200610.5 Mean overall dimensionsThe mean overall diameter of the cable shall be within the limits specified in the appropriate construction table. Conformity shall be checked by the method described in BS EN 60811-1-1:1995, 8.3.One sample of cable shall be taken
43、from each of three places, separated by at least 1 m. For diameters not exceeding 25 mm, take the mean of six measurements as the mean overall diameter. For diameters exceeding 25 mm, take the mean of three measurements as the mean overall diameter.When embossing in accordance with Clause 8 is used,
44、 the points at which measurements are made shall not coincide with the embossing.10.6 Flame propagation on single cableCables shall be tested in accordance with BS EN 60332-1-2. The test shall be carried out on a sample of completed cable. After the test, the cable shall conform to the performance c
45、riteria recommended in BS EN 60332-1-2:2004, Annex A.11 Type tests for finished cables11.1 GeneralType tests shall be performed as identified in Table A.1. The tests specified in clauses shall be performed under the test conditions specified in Annex C unless otherwise specified in the details for t
46、he particular test. NOTE 1 The schedule of tests given in Annex A shows the category of each test parameter, and gives cross-references to the appropriate requirements and test methods.NOTE 2 Type tests for components are covered in Clauses 5 to 7 and are identified in Table A.1.11.2 Long-term resis
47、tance of PVC insulation to d.c.When the cable is tested in accordance with BS EN 50395:2005, Clause 9, the insulation shall meet the requirements given in that clause. BS 6231:20066 BSI 2006Table 1 PVC insulated flexible cable Type BKConstruction:Conductor: class 5 copper, plain annealedInsulation:
48、PVC type TI 1.Colours for identification:Single colours: Any colour is permitted subject to the notes in Clause 7Bi-colour: Green-and-yellow (for earthing or similar protection, see Clause 7, notes 2 and 3)Nominal cross-sectional area of conductor mm2Mean radial thickness of insulation Mean overall
49、diameter Minimum insulation resistance at 70 C MkmmmLower limit mmUpper limit mm0.5 0.8 2.4 3.0 0.01610.75 0.8 2.6 3.1 0.01411.0 0.8 2.7 3.3 0.01281.5 0.8 3.0 3.6 0.01112.5 0.8 3.4 4.1 0.00944 0.8 3.9 4.8 0.00776 0.8 4.4 5.3 0.005910 1.0 5.7 7.2 0.005816 1.0 6.7 9.0 0.004825 1.2 8.4 11.5 0.004735 1.2 9.7 12.5 0.004050 1.4 11.5 15.4 0.003970 1.4 13.2 17.5 0.003395 1.6 15.1 19.2 0.0032120 1.6 16.7 21.2 0.0029150 1.8 18.6 23.9 0.0029185 2.0 20.6 25.9 0.0029240 2.2 23.5 28.9 0.0028 BSI 2006 7BS 6231:2006Table 2 PVC insulated flexible
