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1、BRITISH STANDARD BS 7655-2.1: 1997 Specification for Insulating and sheathing materials for cables Part 2: Cross-linked elastomeric sheathing compounds Section 2.1 Harmonized types IMPORTANT NOTE. This Section of BS 7655 is to be read in conjunction with BS 7655-0. ICS 29.035.20 Licensed Copy: Londo
2、n South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and co
3、mes into effect on 15 October 1997 BSI 10-1999 First published April 1993 Second edition October 1997 The following BSI references relate to the work on this standard: Committee reference GEL/20/3 Draft for comment 96/213358 DC ISBN 0 580 28361 1 Committees responsible for this British Standard The
4、preparation of this British Standard was entrusted by Technical 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 Cable Makers Confeder
5、ation British Plastics Federation British Railways Board British Rubber Manufacturers Association Ltd. British Telecommunications plc Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association ERA Technology Ltd. GAMBICA (BEAMA Ltd.) London Underground Ltd. Ministry
6、 of Defence Queen Mary and Westfield College Telecommunications Cables Group of BCMC Warrington Fire Research Centre Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Co
7、py, (c) BSI BS 7655-2.1:1997 BSI 10-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Definitions1 4Requirements1 Table 1 Types of harmonized elastomeric sheath1 Table 2 Test requirements2 Licensed Copy: London South Bank University, London South Bank Univ
8、ersity, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 ii BSI 10-1999 Foreword This Section of BS 7655 has been prepared by Subcommittee GEL/20/3. It supersedes BS 7655-2.1:1993 which is withdrawn. It specifies harmonized types of cross-linked elastomeric sheathing c
9、ompounds in accordance with HD 22.1. The revision introduces compound types EM 6 and EM 7, in accordance with A20 of HD 22.1 S2. 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
10、 the relevant standard for each test method is given in Part 0, which is to be read in conjunction with this Section. 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
11、 British 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 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
12、s will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 BSI 10-19991 1 Scope This Section of BS 7655 specifies the requirements for
13、 the cross-linked elastomeric sheathing 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 harmoniz
14、ed elastomeric sheath 2 References 2.1 Normative references For the purposes of this Section of BS 7655, the requirements of 2.1 of BS 7655-0 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. 2.2 In
15、formative references For the purposes of this Section of BS 7655, the requirements of 2.2 of BS 7655-0 apply with regard to informative references. 3 Definitions For the purposes of this Section of BS 7655 the definitions given in clause 3 of BS 7655-0 apply. 4 Requirements The requirements specifie
16、d for each compound listed in Table 2 shall be met when the compound is tested using the test methods listed against each particular requirement. NOTEFor cross-references to the latest editions of the test method standards see Table 2 of BS 7655-0. Type Maximum cable operating temperature C General
17、application EM 160Ordinary duty EM 260Ordinary duty oil-resisting and flame retardant EM 360Ordinary duty EM 4110Ordinary duty vulcanized EVA or equivalent synthetic elastomer EM 690Ordinary duty EPR or equivalent synthetic elastomer EM 790Ordinary duty CSP or equivalent synthetic elastomer Licensed
18、 Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 2 BSI 10-1999 Table 2 Test requirements Test Test method in accordance with BS EN 60811 unless otherwise stated Requirements for compound type SectionCla
19、useEM 1EM 2EM 3EM 4EM 6EM 7 Properties in the state as manufactured Minimum tensile strength (N/mm2) Minimum elongation at break (%) 1-19.2 7 300 10 300 7 250 6.5 200 7 250 10 250 Properties after ageing in air oven Temperature (C) Duration (h) Minimum tensile strength (N/mm2) Maximum variation (%)
20、Minimum elongation at break (%) Maximum variation (%) Continued ageing conditions Temperature (C) Total duration of treatment (h) Maximum variation for tensile strength (%) Maximum variation for elongation at break (%) 1-28.1 70 2 10 24 20 250 30 70 2 10 24 15a 250 25a 80 2 10 24 30 30 150 2 10 24 3
21、0 30 120 2 3 24 7 200 120 2 10 24 20b 30b 120 2 7 24 30 40 Properties after ageing in air bomb Temperature (C) Duration (h) Minimum tensile strength (N/mm2) Maximum variation (%) Maximum variation for elongation at break (%) 1-28.2 150 2 7 24 6 30a Bending test at low temperature Temperature (C) 1-4
22、8.2 35 2 35 2 15 2 35 2 30 2 Requirementno cracks Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 BSI 10-19993 Table 2 Test requirements Test Test method in accordance with BS EN 60811 unless o
23、therwise stated Requirements for compound type SectionClauseEM 1EM 2EM 3EM 4EM 6EM 7 Elongation test at low temperature Temperature (C) Minimum elongation without break (%) 1-48.4 35 2 30 35 2 30 15 2 30 35 2 30 30 2 30 Ozone resistance test Temperature (C) Duration (h) Ozone concentration (ppm) 2-1
24、8.1 25 2 24 250 to 300 25 2 24 250 to 300 25 2 24 250 to 300 Requirementno cracks no cracks Alternative ozone resistance test (low concentration) Temperature (C) Duration (h) Ozone concentration (pphm) BS 6469- 99.113 40 2 72 200 50 40 2 72 200 50 40 2 72 200 50 Requirementno cracks no cracks Hot se
25、t test Temperature (C) Duration (min) Mechanical stress (N/mm2) Requirements Maximum elongation under load (%) Maximum elongation after unloading (%) 2-19 200 3 15 0.2 100 25 200 3 15 0.2 100 25 200 3 15 0.2 100 25 250 3 15 0.2 100 25 250 3 15 0.2 100 25 200 3 15 0.2 100 25 Mineral oil immersion tes
26、t Temperature (C) Duration (h) Maximum variation from unaged sample for the tensile strength (%) Maximum variation from unaged sample for the elongation at break (%) 2-110 100 2 24 40 40 100 2 24 40 40 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT
27、+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.1:1997 4 BSI 10-1999 Table 2 Test requirements Test Test method in accordance with BS EN 60811 unless otherwise stated Requirements for compound type SectionClauseEM 1EM 2EM 3EM 4EM 6EM 7 Pressure test at high temperature Temperature (C) Duration (h)
28、 k value Requirement Maximum penetration (%) 3-18.2 150 2 0.5 1.0 50 Carbon black contentc (min %) 4-111 22 a Only a reduction in values is subject to verification. b Variation in this case is the difference between the median value after ageing for ten days and the median value after ageing for thr
29、ee days expressed as a percentage of the latter. c Only applicable when called up in the relevant cable standard. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank Universit
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