BS-7835-2007.pdf
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1、BS 7835:2007 Electric cables Armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 kV to 19/33 kV having low emission of smoke and corrosive gases when affected by fire Requirements and test methods ICS 29.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRI
2、GHT LAW BRITISH STANDARD Incorporating Corrigendum No. 1 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2008 ISBN 978
3、0 580 64040 7 The following BSI references relate to the work on this standard: Committee reference GEL/20/16 Draft for comment 07/30143023 DC Publication history First published June 1996 Second edition, December 2000 Third edition, November 2007 Amendments issued since publication Amd. no.DateText
4、 affected C1August 2008See 21.6 and 21.7 BS 7835:2007 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI BSI 2008i BS 7835:2007 Contents Foreword iii 1Scope 1 2Normative references 1 3Terms and definitions 2 4Voltage designation 4 5Non-metallic materials 4 6Co
5、nductors 4 7Conductor screen 4 8Insulation 4 9Insulation screen 5 10Assembly of three-core cables, including inner coverings and fillers 5 11Metallic layer 7 12Metallic armour 8 13Oversheath 9 14Marking 10 15End sealing 11 16Schedule of tests 12 17Test conditions 14 18Routine tests 14 19Sample tests
6、 16 20Type tests Materials 21 21Type tests Electrical 25 Annexes Annex A (informative) Recommendations for the selection of cables 29 Annex B (normative) Information to be supplied and items to be agreed 32 Annex C (informative) Recommendations for the installation of cables 33 Annex D (informative)
7、 Guide to use of cables 36 Annex E (normative) Fictitious calculation method for determination of dimensions of protective coverings 38 Annex F (normative) Rounding of numbers 43 Annex G (informative) Guidance on the scope of type tests 44 Annex H (normative) Thickness measurements 47 Annex I (norma
8、tive) Test method for cold strippability of the extruded semi-conducting layer of an insulation screen 47 Annex J (normative) Method for measurement of resistivity of extruded semi-conducting conductor screen and insulation screen 48 Annex K (normative) Method for measurement of resistivity of lappe
9、d inner covering 51 Annex L (normative) Wet compatibility test for galvanized steel wires and semi-conducting tape layers 52 Annex M (normative) Abrasion test 53 Annex N (normative) Test for shrinkage of oversheath on cable 54 Annex O (normative) Insulation resistance constant test on oversheath 55
10、Bibliography 56 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI BS 7835:2007 ii BSI 2008 List of figures Figure J.1 Test piece and arrangement of electrodes for measurement of resistivity of the conductor screen 50 Figure J.2 Test piece and arrangement of e
11、lectrodes for measurement of resistivity of the insulation screen 51 Figure L.1 Test cell for wet compatibility test of galvanized steel wires and semi-conducting tape layers 52 Figure M.1 Abrasion test 54 List of tables Table 1 Nominal thickness of insulation 5 Table 2 Thickness of extruded inner c
12、overing 6 Table 3 Nominal diameter of round armour wires 8 Table 4 Schedule of tests 12 Table 5 Tolerances on temperature values 14 Table 6 DC resistance of copper wire screen 15 Table 7 Voltage for partial discharge test 15 Table 8 Voltage test on complete cable 16 Table 9 Number of samples for the
13、 four-hour voltage test, the hot set test on the insulation and the smoke emission test 17 Table 10 Minimum transmittance levels 20 Table 11 Voltages for four-hour voltage test 21 Table 12 Mass of zinc coating 22 Table 13 Compatibility requirements 24 Table 14 Tan in relation to voltage 26 Table 15
14、Tan in relation to temperature 26 Table 16 Voltage for impulse voltage test 27 Table A.1 Selection of cables for three-phase a.c. systems 30 Table C.1 Bending radius during installation 33 Table C.2 Bending radius during installation for cables adjacent to joints or terminations 33 Table E.1 Fictiti
15、ous diameter of conductor 40 Table E.2 Increase of diameter for concentric conductors and metallic screens 41 Table M.1 Vertical force on cable during abrasion test 53 Summary of pages This document comprises a front cover, an inside front cover, pages i to iii, a blank page, pages 1 to 56, an insid
16、e back cover and a back cover. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI BSI 2008iii BS 7835:2007 Foreword Publishing information This British Standard is published by BSI and came into effect on 30 November 2007. It was prepared by Subcommittee GEL/2
17、0/16, Medium/high voltage cables, under the authority of Technical Committee GEL/20, Electric cables. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes BS 7835:2000, which is withdrawn. Information about t
18、his document This revision of BS 7835 has been prepared to bring the requirements up to date in accordance with current practice in the industry and to align with the methods used for calculating cable component dimensions given in IEC 60502-2. This standard specifies requirements for cables in the
19、rated voltage range from 3.8/6.6 kV up to 19/33 kV which are insulated with cross-linked polyethylene (XLPE) or ethylene propylene rubber compound (EPR), with improved performance under fire conditions compared to the cables specified in BS 6622. Hazard warnings Use of this document It has been assu
20、med in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its req
21、uirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is presented in smaller italic type and does not constitute a normative element. Contractual and legal considerations This publication does not purport to i
22、nclude all necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. WARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adeq
23、uate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI iv BSI 2008This page deliberately left b
24、lank BS 7835:2007 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:25, Uncontrolled Copy, (c) BSI BSI 20081 BS 7835:2007 1 Scope This British Standard specifies requirements and test methods for the construction, dimensions and mechanical and electrical properties of armoured cables with
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