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1、BRITISH STANDARD BS 7655-2.3: 1993 Specification for Insulating and sheathing materials for cables Part 2: Elastomeric sheathing compounds Section 2.3 General application Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy,
2、 (c) BSI BS 7655-2.3:1993 This British Standard, having been prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1993 BSI 01-1999 The following BSI references relate to the wo
3、rk on this standard: Committee reference CIL/20 Draft for comment 92/25662 DC ISBN 0 580 22029 X 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
4、 which the following bodies were represented: Aluminium Federation Association of Consulting Engineers Association of Manufacturers of Domestic Electrical Appliances British Approvals Service for Cables British Cable Makers Confederation British Plastics Federation British Steel Industry Department
5、of the Environment (Property Services Agency) Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association Engineering Equipment and Materials Users Association Institution of Electrical Engineers London Regional Transport The following bodies were also represented in
6、 the drafting of the standard, through subcommittees and panels: British Railways Board British Rubber Manufacturers Association Ltd. British Telecommunications plc ERA Technology Ltd. GAMBICA (BEAMA Ltd.) Institution of Incorporated Executive Engineers London Underground Ltd. Queen Mary and Westfie
7、ld 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 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.3:1993 BSI 0
8、1-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Definitions1 4Test requirements for physical properties1 Table 1 Types of elastomeric sheathing compounds for general application 1 Table 2 Test methods 1 Table 3 Test requirements 2 Table 4 Tol
9、erances on temperature values2 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.3:1993 ii BSI 01-1999 Foreword This Section of BS 7655 has been prepared under the di
10、rection of the Cables and Insulation Standards Policy Committee. This Section specifies the physical properties of general application elastomeric sheathing compounds. For a general introduction to the BS 7655 series and a list of Parts and Sections, Part 0 should be consulted. A British Standard do
11、es 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 front cover, an ins
12、ide front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, L
13、ondon South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.3:1993 BSI 01-19991 1 Scope This Section of BS 7655 specifies the physical properties of general application elastomeric sheathing compounds given in Table 1. The relevant test methods for verificat
14、ion of conformity are given in BS 6469. This Section is to be used in conjunction with BS 7655-0. Table 1 Types of elastomeric sheathing compounds for general application 2 Normative references This Section of BS 7655 incorporates by dated or undated reference, provisions from other publications. Th
15、ese normative references are cited at the appropriate places in the text and the publications are listed on the inside back page. For a dated reference, only the edition cited applies; any subsequent amendments to or revisions of the publication apply to this British Standard only when incorporated
16、in the reference by amendment or revision. For undated references, any amendment to, or the latest edition of, the cited publication applies. 3 Definitions For the purposes of this Section of BS 7655, the definitions given in BS 1755-1, BS 1755-2, BS 3558, BS 4727-2:Group 08 and BS 7655-0 apply, tog
17、ether with the following. 3.1 variation the difference between the median value after ageing and the median value without ageing expressed as a percentage of the latter 3.2 median value when several test results have been obtained and ordered in an increasing or decreasing succession, the median is
18、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 4 Test requirements for physical properties 4.1 General 4.1.1 The test methods shall be as specified in Table 2 and the method of pre-conditioning shall be as described in 4.2. Th
19、e temperatures used for the test methods shall conform to the conditions specified in 4.3. Table 2 Test methods (in accordance with BS 6469 unless otherwise stated) 4.1.2 When tested by the methods specified in 4.1.1 the properties shall be in accordance with the requirements given in Table 3 for th
20、e particular type of material. 4.2 Pre-conditioning The tests shall be carried out not less than 16 h after extrusion and cross-linking. 4.3 Temperatures for test methods 4.3.1 Ambient temperature Tests shall be made at an ambient temperature within the range 5 C to 35 C unless otherwise specified i
21、n the details for the particular test. TypeMaximum material operating temperature C General application RS I RS 2 RS 3 RS 4 RS 6 60 60 85 85 60 Heavy duty Heavy duty oil-resisting and flame retardant Ordinary duty oil-resisting and flame retardant Heavy duty oil-resistant and flame retardant Heavy d
22、uty oil-resistant and flame retardant with increased tear resistance TestMethod SectionClause Properties in the state as delivered Tensile strength and elongation at break 1.1:19929 Properties after ageing in air oven Tensile strength and elongation at break 1.2:19928.1 Properties after ageing in ai
23、r bomb Tensile strength and elongation at break 1.2:19928.2 Hot set test Mineral oil immersion test Test for tear resistance 2.1:1992 2.1:1992 99.1:1992 9 10 9 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
24、 7655-2.3:1993 2 BSI 01-1999 Table 3 Test requirements 4.3.2 Tolerances on temperature values Unless otherwise stated in the particular specification the tolerances on temperature values quoted in the test methods shall be as given in Table 4. Table 4 Tolerances on temperature values TestRequirement
25、s for sheath type RS 1RS 2RS 3RS 4RS 6 Properties in the state as delivered Minimum tensile strength Minimum elongation at break N/mm2 % 12 300 11 250 8 250 11 250 11 250 Test for tear resistance Minimum valueN/mm2557.5 Properties after ageing in air oven Temperature Duration Maximum variation for t
26、ensile strength Minimum elongation at break Maximum variation for elongation at break C h % % % 70 10 24 20 250 20 70 10 24 15a 200 25a 120 7 24 30 40 120 7 24 30 40 70 10 24 15a 250 25a Properties after ageing in air bomb Temperature Duration Maximum variation for tensile strength Maximum variation
27、 for elongation at break C hr % % 127 40 50a 50a 127 40 50a 50a Hot set test Temperature Duration C min 200 15 200 15 200 15 200 15 200 15 Mechanical stress Requirements N/mm20.20.20.20.20.2 Maximum elongation under load Maximum elongation after unloading % % 100 25 100 25 100 25 100 25 100 25 Miner
28、al oil immersion test Temperature Duration Maximum variation for tensile strength Maximum variation for elongation at break C h % % 100 24 40 40 100 24 40 40 100 24 40 40 100 24 40 40 a Only a reduction in values in subject to verification. Specified temperature, t C Tolerance C 40 # t #0 0 150 2 Ac
29、cording to relevant clause 2 3 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-2.3:1993 BSI 01-1999 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS IN
30、STITUTION, London BS 1755, Glossary of terms used in the plastics industry. BS 1755-1:1982, Polymer and plastics technology. BS 1755-2:1974, Manufacturing processes. BS 3558:1980, Glossary of rubber terms. BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and col
31、our terms. BS 4727-2, Terms particular to power engineering. BS 4727-2:Group 08:1986, Electric cable terminology. BS 6469, Insulating and sheathing materials of electric cables. BS 6469-1, Methods of test for general application. BS 6469-1.1:1992, Measurement of thickness and overall dimensions. Tes
32、ts for determining the mechanical properties. BS 6469-1.2:1992, Thermal ageing methods. BS 6469-2, Methods of test specific to elastomeric compounds. BS 6469-2.1:1992, Ozone resistance test. Hot set test. Mineral oil immersion test. BS 6469-99, Test methods used in the United Kingdom but not specifi
33、ed in Parts 1 to 5. BS 6469-99.1:1992, Non electrical tests. BS 7655, Specification for insulating and sheathing materials. BS 7655-0:1993, General introduction. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
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