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1、BRITISH STANDARD BS 7655-4.3: 1993 Specification for Insulating and sheathing materials for cables Part 4: PVC sheathing compounds Section 4.3 Special applications RF cables Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:56 GMT+00:00 2006, Uncontrolled Co
2、py, (c) BSI BS 7655-4.3:1993 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 02-1999 The following BSI references relate to the
3、 work on this standard: Committee reference CIL/20 Draft for comment 92/25662 DC ISBN 0 580 22040 0 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, u
4、pon 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 Departme
5、nt 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
6、 in 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 West
7、field 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 11:56:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-4.3:1993 BS
8、I 02-1999i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Composition 1 5 Colours 1 6 Test requirements for physical and electrical properties 1 Table 1 Types of special application PVC sheath1 Table 2 Test methods1 Table 3 Te
9、st requirements 2 Table 4 Tolerances on temperature values 2 List of references Inside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-4.3:1993 ii BSI 02-1999 Foreword This Section of BS 7655
10、 has been prepared under the direction of the Cables and Insulation Standards Policy Committee. This Section specifies the physical and electrical properties of special applications PVC sheathing compounds types 7 and 8. For a general introduction to the BS 7655 series and a list of Parts and Sectio
11、ns, Part 0 should be consulted. 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 British Standard does not of itself confer immunity from legal obligations. Summary o
12、f pages This document comprises a front cover, an inside 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
13、cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-4.3:1993 BSI 02-19991 1 Scope This Section of BS 7655 specifies the physical and electrical properties of special applications PVC sheathing compou
14、nds given in Table 1. The relevant test methods for verification of conformity are given in BS 6469. These compounds are for use on cables conforming to BS 2316. This Section is to be used in conjunction with BS 7655-0. Table 1 Types of special application PVC sheath 2 Normative references This Sect
15、ion of BS 7655 incorporates by dated or undated reference, provisions from other publications. These 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 ame
16、ndments to or revisions of the publication apply to this British Standard only when incorporated 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, th
17、e definitions given in BS 1755-1, BS 1755-2, BS 3558 and BS 4727-2:Group 08 apply, together 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 ha
18、ve been obtained and ordered in an increasing or decreasing succession, the median 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 4 Composition The sheath shall consist of a compound based on one of the following materials
19、suitably compounded and processed to conform to this standard: a) polyvinyl chloride (PVC); or b) a copolymer of vinyl chloride; or c) a mixture of materials a) and b). 5 Colours Opaque sheaths shall be of a colour that reasonably matches one of the colours given in BS 6746C. NOTEThere is no require
20、ment for the colour of transparent sheath. 6 Test requirements for physical and electrical properties 6.1 General 6.1.1 The test methods shall be as specified in Table 2 and the method of pre-conditioning shall be as described in 6.2. The temperatures used for the test methods shall conform to the c
21、onditions specified in 6.3. Table 2 Test methods (in accordance with BS 6469 unless otherwise stated) TypeMaximum material operating temperature C General application 770Low temperature non-migratory for radio-frequency cables conforming to BS 2316 870Low temperature general purpose for radio-freque
22、ncy cables conforming to BS 2316 TestMethod SectionClause Properties in the state as delivered Tensile strength and elongation at break 1.1:19929 Bending test at low temperature 1.4:19928.2 Elongation test at low temperature 1.4:19928.4 Pressure test at high temperature 3.1:19928.2 Resistance to cra
23、cking3.1:19929.2 Loss of mass test3.2:19928.2 Hot deformation test99.1:199210 Insulation resistance constant test 99.2:19928 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-4.3:1993 2 BSI 02-1999 Table
24、3 Test requirements 6.1.2 When tested by the methods specified in 6.1.1 the properties shall be in accordance with the requirement given in Table 3 for the particular type of material. 6.2 Pre-conditioning The tests shall be carried out not less than 16 h after extrusion. 6.3 Temperatures for test m
25、ethods 6.3.1 Ambient temperature Tests shall be made at an ambient temperature within the range 5 C to 35 C unless otherwise specified in the details for the particular test. 6.3.2 Tolerances on temperature values Unless otherwise stated in the particular specification the tolerances on temperature
26、values quoted in the test methods shall be as given in Table 4. Table 4 Tolerances on temperature values TestRequirements for sheath type 78 Properties in the state as delivered Minimum tensile strength N/mm2 7.57.5 Minimum elongation at break%125150 Bending test at low temperature TemperatureC 40 4
27、0 Requirementno cracks Elongation test at low temperature TemperatureC 40 40 Minimum elongation at break%2020 Pressure test at high temperature Force exerted by the blade aa Duration of heating under load aa TemperatureC6060 Maximum indentation%5050 Resistance to cracking TemperatureC100120 Requirem
28、entno cracks Loss of mass test TemperatureC8080 Durationh 7 24 7 24 Maximum loss of mass mg/cm2 22 Hot deformation test Maximum deformation (applicable only for specified radial thickness less than 0.4 mm) %6565 Insulation resistance constant test Minimum K value at 20 CM7km0.00350.0035 a See 8.2 of
29、 BS 6469-3.1:1992. Specified temperature, t C Tolerance C 40 # t #0 2 0 150 3 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7655-4.3:1993 BSI 02-1999 List of references (see clause 2) Normative references
30、BSI standards publications BRITISH STANDARDS INSTITUTION, 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 2316, Specification for radio-frequency cables. BS 2316-1:1968 & BS 2316-2:1968, Gen
31、eral requirements and tests. British Government services requirements. BS 2316-3:1969, Cable data sheets (metric and imperial units). BS 3558:1980, Glossary of rubber terms. BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms. BS 4727-2, Terms part
32、icular to power engineering. BS 4727-2:Group 08:1986, Electric cable terminology. BS 6469, Common test methods for insulating and sheathing materials of electric cables. BS 6469-1, Methods for general application. BS 6469-1.1:1992, Measurement of thickness and overall dimensions Tests for determinin
33、g the mechanical properties. BS 6469-1.4:1992, Tests at low temperature. BS 6469-3, Methods specific to PVC compounds. BS 6469-3.1:1992, Pressure test at high temperature Tests for resistance to cracking. BS 6469-3.2:1992, Loss of mass test Thermal stability test. BS 6469-99, Test methods used in th
34、e United Kingdom but not specified in Parts 1 to 5. BS 6469-99.1:1992, Non-electrical tests. BS 6469-99.2:1992, Electrical tests. BS 6746C:1969, Colour chart for PVC insulation and sheath of electric cables. BS 7655, Specification for insulating and sheathing materials for cables. BS 7655-0:1993, Ge
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