BS-6746-1990.pdf
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1、BRITISH STANDARD BS 6746:1990 Incorporating Amendment No. 1 Specification for PVC insulation and sheath of electric cables BS 6746:1990 This British Standard, having been prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Bo
2、ard of BSI and comes into effect on 31 August 1990 BSI 12-1998 First published August 1969 Second edition May 1976 Third edition December 1989 Fourth edition August 1990 The following BSI references relate to the work on this standard: Committee reference CIL/20 Draft for comment 89/24508 DC ISBN 0
3、580 18517 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cables and Insulation Standards Policy Committee (CIL/-) to Technical Committee CIL/20, upon which the following bodies were represented: Aluminium Federation Association of Con
4、sulting Engineers Association of Manufacturers of Domestic Electrical Appliances British Approvals Service for Electric Cables British Cable Makers Confederation British Plastics Federation British Railways Board British Steel Industry British Telecommunications plc Department of the Environment (Pr
5、operty Services Agency) Department of Trade and Industry (Consumer Safety Unit, CA Division) ERA Technology Ltd. Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institution of Electrical Engineers London Regional Transport The following bodies w
6、ere also represented in the drafting of the standard, through subcommittees and panels: Association of Supervisory and Executive Engineers British Rubber Manufacturers Association GAMBICA (BEAMA Ltd.) Queen Mary College Industrial Research Amendments issued since publication Amd. No.DateComments 693
7、8February 1992Indicated by a sideline in the margin BS 6746:1990 BSI 12-1998i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Composition1 4Colours1 5Test requirements for physical and electrical properties1 Appendix A Method of test for insulation resistance
8、 constant (K value)5 Appendix B Method of test for colour fastness to daylight5 Appendix C Method of test for bleeding and blooming of colour5 Table 1 Types of insulation and sheath1 Table 2 Test requirements for compounds designated according to HD 212 Table 3 Test requirements for compounds design
9、ated according to this standard3 Publications referred toInside back cover BS 6746:1990 ii BSI 12-1998 Foreword This new edition of BS 6746 has been prepared under the direction of the Cables and Insulation Standards Policy Committee and it supersedes BS 6746:1984, which is withdrawn. This edition i
10、ntroduces technical changes but it does not reflect a full review or revision of the standard, which will be undertaken in due course. This standard should be read in conjunction with BS 6469 which describes the test methods common to various electric cable materials and is referred to in British St
11、andards for those materials. The second edition of this standard was prepared to take account of CENELEC1) Harmonization Document HD 21. The third edition agreed with HD 21.S2 dated October 1982. This edition incorporates amendments 1 and 2 (published September 1986 and February 1990) to BS 6746:198
12、4 and introduces compound TI 4 which appears in amendment No. 4 (dated January 1989) to HD 21.1 S2. Differences in the text between this edition and BS 6746:1984 are indicated by a line in the margin. Amendment No. 1 incorporates PVC type TI 3 compound to align with Amendment No. 2 to HD 21.1 S2. Th
13、e requirements for the various types of compound have been drafted such that compliance with them can be checked by testing samples taken from finished cables. Attention is drawn to the certification services of the British Approvals Service for Electric Cables (BASEC)2). These services include lice
14、nsing manufacturers to use BASEC certification trade marks as independent assurance that cables or cords have been designed and manufactured to appropriate British Standards. BASEC is a subscriber to an agreement in CENELEC whereby cables or cords coming within Harmonized Code Designations and manuf
15、actured under a BASEC licence can carry marks acceptable to other signatory countries (CENELEC “Common marking”). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Bri
16、tish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments
17、 incorporated. This will be indicated in the amendment table on the inside front cover. 1) European Committee for Electrotechnical Standardization. 2) British Approvals Service for Electric Cables, Silbury Court, 360 Silbury Boulevard, Milton Keynes, Buckinghamshire MK9 2AF. BS 6746:1990 BSI 12-1998
18、1 1 Scope This British Standard specifies the physical and electrical requirements for the types of PVC insulation and sheath of electric cables given in Table 1. The relevant test methods for verification of compliance are given either in BS 6469 or in the appendices of this standard. NOTEThe title
19、s of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 median value when several test results have been obtained and ordered in an increasing or decreasing succession, the me
20、dian value is the middle value if the number of available values is odd, and is the mean of the two middle values if the number is even 2.2 variation the difference between the median value after ageing and the median value without ageing, expressed as a percentage of the latter 3 Composition The in
21、sulation or sheath shall consist of a compound based on one of the following materials, suitably compounded and processed to comply with this standard: a) polyvinyl chloride (PVC); or b) a copolymer of vinyl chloride; or c) a mixture of materials a) and b). 4 Colours Opaque insulation and sheath sha
22、ll be of a colour that reasonably matches one of the colours given in BS 6746C. NOTEThere is no requirement for the colour of transparent insulation and sheath. 5 Test requirements for physical and electrical properties 5.1 When tested by the methods specified in 5.2 and 5.3, the properties of the i
23、nsulation or sheath shall be in accordance with the requirements given in Table 2 or Table 3 for the particular type of material. Table 1 Types of insulation and sheath TypeMaximum operating temperature General application InsulationSheath C TI 170General purpose TM 170For use over cables operating
24、at a maximum conductor temperature of 80 C TI 270Flexible (including transparent) TM 270General purpose flexible TI 390Heat resistant TI 470For installation at low temperatures 270Hard 485FlexibleFlexible 585Hard 670General purpose 770Low temperature non-migratory for radio-frequency cables complyin
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