1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7655-4.2:2000 ICS 29.0
2、35.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Insulating and sheathing materials for cables Part 4: PVC sheathing compounds Section 4.2: General application IMPORTANT NOTE This section of BS 7655 is to be read in conjunction with BS 7655-0.This Britis
3、h Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 2000 BSI 11-2000 First published April 1993 Second edition November 2000 The following BSI references relat
4、e to the work on this standard: Committee reference GEL/20/3 Draft for comment 99/240495 DC ISBN 0 580 33197 0 BS 7655-4.2:2000 Amendments issued since publication Amd. No. Date Comments Committees responsible for this British Standard The preparation of this British Standard was entrusted by Techni
5、cal Committee GEL/20, Electric cables, to Subcommittee GEL/20/3, Insulation and sheath, upon which the following bodies were represented: Association of Consulting Engineers British Approvals Service for Cables British Cables Association British Plastics Federation British Rubber Manufacturers Assoc
6、iation Ltd. Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association ERA Technology Ltd. GAMBICA (BEAMA Ltd.) Institute of Fire Prevention Officers London Underground Ltd. Ministry of Defence Queen Mary and Westfield College Railtrack Warrington Fire Research Cent
7、reBS 7655-4.2:2000 BSI 11-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Requirements 1 Bibliography 3ii BSI 11-2000 BS 7655-4.2:2000 Foreword This section of BS 7655 has been prepared by Subcommittee GEL/20/3. It super
8、sedes BS 7655-4.2:1993 which is withdrawn. This section specifies the requirements for general application PVC sheathing compounds Types 5, 6, 9 and 10. This revision brings this section of BS 7655 fully into line with BS 7655-0:1997, including amendment 1:2000 and introduces the new Type 10 compoun
9、d. Test methods are specified in this section of BS 7655 by reference to the latest edition of standards in which they appear. A dated reference to the most recent edition of the relevant standard for each test method is given in BS 7655-0, which is to be read in conjunction with this section. A Bri
10、tish 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 British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fro
11、nt cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 7655-4.2:2000 BSI 11-2000 1 1 Scope This section of BS 7655 specifies the requirements for the general application PVC sh
12、eathing compounds listed in Table 1. The relevant test methods are given in BS EN 60811 and BS 6469. This section is to be read in conjunction with BS 7655-0, which contains essential provisions for the application of this section of BS 7655. Table 1 Types of general application PVC sheathing compou
13、nds Type Maximum material operating temperature General application 8C 5 85 Hard 6 70 General purpose 9 For use over cable operating at a maximum temperature of 908C 10 70 For outdoor use at low temperatures 2 Normative references For the purposes of this section of BS 7655, the requirements of BS 7
14、655-0, 2.1 apply with regard to normative references. The latest editions of the standards giving test methods are listed in the most recent edition of BS 7655-0. 3 Definitions For the purposes of this section of BS 7655 the definitions given in BS 7655-0, clause 3 apply, together with the following
15、. 3.1 PVC combinations of materials, of which polyvinyl chloride is the characteristic constituent, suitably selected, proportioned and treated, which meet the requirements given in the particular specification 4 Requirements The requirements specified for the compounds listed in Table 2 shall be me
16、t when the compound is tested using the test methods listed against each particular requirement. NOTE For cross-references to the latest editions of the test method standards see BS 7655-0, Table 2.2 BSI 11-2000 BS 7655-4.2:2000 Table 2 Test requirements Test Test method in accordance with BS EN 608
17、11 unless otherwise stated Requirements for compound type Section Clause 5 6 9 10 Properties in the state as manufactured 1-1 9.2 Minimum tensile strength (N/mm 2 ) 12.5 6 12.5 10 Minimum elongation at break (%) 125 125 150 150 Properties after ageing in air oven 1-2 8.1.3.1 Temperature (8C) 135 2 1
18、00 28 0 2 Duration (h) 103 24 73 24 73 24 Minimum tensile strength (N/mm 2 ) 12.5 12.5 10 Maximum variation (%) 25 25 20 Minimum elongation at break (%) 125 150 150 Maximum variation (%) 25 25 20 Bending test at low temperature 1-4 8.2 Temperature (8C) 215 2 215 2 215 2 240 2 Requirement no cracks E
19、longation test at low temperature 1-4 8.4 Temperature (8C) 215 2 215 2 215 2 240 2 Minimum elongation without break (%) 20 20 20 20 Impact test at low temperature 1-4 8.5 Temperature (8C) 215 2 240 2 Requirement no cracks no cracks Pressure test at high temperature 3-1 8.2 Temperature (8C) 95 28 0 2
20、9 0 27 0 2 Maximum indentation (%) 50 50 50 50 Resistance to cracking 3-1 9.2 Temperature (8C) 150 2 150 2 150 2 150 2 Requirement no cracks Loss of mass test 3-2 8.2 Temperature (8C) 115 28 0 2 100 28 0 2 Duration (h) 103 24 73 24 73 24 73 24 Maximum loss of mass (mg/cm 2 ) 1.5 2 1.5 2 Hot deformat
21、ion test 1) BS 6469-99.1, clause 10 Maximum deformation (%) 30 65 40 Insulation resistance constant BS 6469-99.2, clause 8 Temperature (8C) 20 22 0 22 0 2 Minimum K value (MV km) 0.0035 0.0035 0.0035 1) Only for specified radial thicknesses less than 0.4 mm. BSI 11-2000 3 BS 7655-4.2:2000 Bibliograp
22、hy See BS 7655-0, 2.2.BS 7655-4.2:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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