BS 7917-1999 Elastomer insulated fire resistant (limited circuit integrity) cables for fixed wiring in ships and on mobile and fixed offshore units - Requirements and test methods《.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7917:1999 ICS 47.020.6

2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Elastomer insulated fire resistant (limited circuit integrity) cables for fixed wiring in ships and on mobile and fixed offshore units Requirements and test methodsThis British Standard, having been prepared under the direction

3、 of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference GEL/20/6 Draft for comment 96/214276 DC ISBN 0 580 33003 6 B

4、S 7917:1999 Amendments issued since publication Amd. No. Date Comments Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/6, Ships cables, upon which the following bodies were

5、represented: British Cable Makers Confederation Institute of Marine Engineers Lloyds Register of Shipping Ministry of Defence UK Offshore Operators Association LimitedBS 7917:1999 BSI 06-1999 i Contents Page Committees responsible Inside front cover Foreword iii 1 Scope 1 2 Normative references 1 3

6、Terms and definitions 1 4 Designation of cables 2 5 General requirements 2 6 Cables 150/250 V (pairs, triples and quads) 5 7 Single-core and multicore cables 600/1 000 V, 1 900/3 300 V and 3 300/3 300 V 14 Annex A (informative) Recommendations for the selection of cables and information on cable ope

7、rating temperatures 28 Annex B (informative) Recommendations for the installation of cables 29 Annex C (normative) Measurement of thickness 30 Annex D (normative) Voltage test 30 Annex E (normative) Insulation resistance tests 31 Annex F (normative) Compatibility test 31 Annex G (informative) Guidan

8、ce on type tests 32 Annex H (informative) Guide to use 34 Bibliography 38 Table 1 Requirements for type SB 1 material 3 Table 2 Diameter of braiding wires 3 Table 3 List of tests applicable to the cables specified in clause 6 8 Table 4 Schedule of tests 8 Table 5 Compatibility requirements 9 Table 6

9、 Elastomer insulated, individually screened pairs, sheathed 150/250 V 10 Table 7 Elastomer insulated, collectively screened pairs, sheathed 150/250 V 10 Table 8 Elastomer insulated, individually screened pairs, sheathed, steel or bronze wire braided, sheathed 150/250 V 11 Table 9 Elastomer insulated

10、, collectively screened pairs, sheathed, steel or bronze wire braided, sheathed 150/250 V 11 Table 10 Elastomer insulated, individually screened triples, sheathed 150/250 V 12 Table 11 Elastomer insulated, collectively screened triples, sheathed 150/250 V 12 Table 12 Elastomer insulated, individuall

11、y screened triples, sheathed, steel or bronze wire braided, sheathed 150/250 V 12 Table 13 Elastomer insulated, collectively screened triples, sheathed, steel or bronze wire braided, sheathed 150/250 V 13 Table 14 Elastomer insulated, individually screened quads, sheathed 150/250 V 13 Table 15 Elast

12、omer insulated, individually screened quads, sheathed, steel or bronze wire braided, sheathed 150/250 V 13 Table 16 List of tests applicable to the cables specified in clause 7 16 Table 17 Schedule of tests 17 Table 18 Compatibility requirements 17 Table 19 Elastomer insulated, sheathed, single-core

13、, two-core, three-core and four-core cables 600/1 000 V 18 Table 20 Elastomer insulated, sheathed, 5, 7, 12, 19, 27 and 37-core cables 600/1 000 V 19BS 7917:1999 ii BSI 06-1999 Page Table 21 Elastomer insulated, sheathed, bronze wire braided, sheathed, single-core cables 600/1 000 V 19 Table 22 Elas

14、tomer insulated, sheathed, steel or bronze wire braided, sheathed, two-core cables 600/1 000 V 20 Table 23 Elastomer insulated, sheathed, steel or bronze wire braided, sheathed, three-core cables 600/1 000 V 20 Table 24 Elastomer insulated, sheathed, steel or bronze wire braided, sheathed, four-core

15、 cables 600/1 000 V 21 Table 25 Elastomer insulated, sheathed, steel or bronze wire braided, sheathed 5, 7, 12, 19, 27 and 37-core cables 600/1 000 V 21 Table 26 Elastomer insulated, sheathed, copper wire braided, sheathed, single-core cables 600/1 000 V 22 Table 27 Elastomer insulated, sheathed, co

16、pper wire braided, sheathed, two-core cables 600/1 000 V 23 Table 28 Elastomer insulated, sheathed, copper wire braided, sheathed, three-core cables 600/1 000 V 24 Table 29 Elastomer insulated, sheathed, copper wire braided, sheathed, four-core cables 600/1 000 V 25 Table 30 Elastomer insulated, she

17、athed, copper wire braided, sheathed 5, 7, 12, 19, 27 and 37-core cables 600/1 000 V 25 Table 31 Elastomer insulated and sheathed, bronze wire braided, sheathed, single-core cables 1 900/3 300 V 26 Table 32 Elastomer insulated and sheathed, steel or bronze wire braided, sheathed, three-core cables 1

18、 900/3 300 V 26 Table 33 Elastomer insulated and sheathed, bronze wire braided, sheathed, single-core cables 3 300/3 300 V 27 Table 34 Elastomer insulated and sheathed, steel or bronze wire braided, sheathed, three-core cables 3 300/3 300 V 27 Table A.1 Selection of cables for a.c. systems 28 Table

19、B.1 Minimum internal bending radius 29 Table B.2 Voltage test after installation 29 Table D.1 Test voltage on completed cable 30 Table E.1 Temperature correction factors for insulation resistance 31 Table G.1 Sample selection chart 33 Table H.1 Maximum spacing of supports 34BS 7917:1999 BSI 06-1999

20、iii Foreword This British Standard has been prepared by Subcommittee GEL/20/6. This new standard has been produced in view of the increasing demand for cables for fixed wiring in ships and on mobile and fixed offshore units having fire resistance (limited circuit integrity) in the event of fire. NOT

21、E Two categories of fire resistance are specified in this standard. Further categories are under consideration. BS 7917 complements BS 6883 which specifies a range of cables having no requirement to maintain fire resistance (limited circuit integrity) in the event of fire. The minimum and maximum di

22、ameters, both those over the inner sheath and those over the outer sheath, quoted in the relevant construction tables are indicative only and do not take into account any glanding requirements. It has been assumed in the preparation of this British Standard that the execution of its provisions will

23、be entrusted to appropriately qualified and experienced people, for whose use it has been produced. WARNING. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does

24、 not absolve the user from legal obligations relating to health and safety at any stage. Annexes C, D, E and F are normative. Annexes A, B, G and H are informative. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises

25、a front cover, an inside front cover, pages i to iv, pages 1 to 38, an inside back cover and a back cover.iv blank BSI 06-1999 1 BS 7917:1999 1 Scope This British Standard specifies requirements for the construction, dimensions and mechanical and electrical properties of cables for fixed wiring of l

26、ighting, power, control, instrumentation and propulsion circuits in ships and on mobile and fixed offshore units, having a rated voltage up to and including 3 300/3 300 V, and which have fire resistance (limited circuit integrity) in the event of fire. 2 Normative references The following normative

27、documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to appli

28、es. BS 4066-1, Tests on electric cables under fire conditions Part 1: Method of test on a single vertical insulated wire or cable. BS 4066-3, Tests on electric cables under fire conditions Part 3: Tests on bunched wires or cables. BS 4109, Specification for copper for electrical purposes Wire for ge

29、neral electrical purposes and for insulated cables and flexible cords. BS 4727-2:Group 08, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 2: Terms particular to power engineering Group 08: Electric cables. BS 6360:1991, Specification for conductor

30、s in insulated cables and cords. BS 6425-1, Tests on gases evolved during the combustion of materials from cables Part 1: Method for determination of amount of halogen acid gas evolved during combustion of polymeric materials taken from cables. BS 7622-1, Measurement of smoke density of electric cab

31、les burning under defined conditions Part 1: Test apparatus. BS 7622-2:1993, Measurement of smoke density of electric cables burning under defined conditions Test procedure and requirements. BS 7655-1.2:1997, Specification of insulating and sheathing materials for cables Part 1: Cross linked elastom

32、eric insulating compounds Section 1.2: General 908C application. BS 7655-2.6:1993, Specification of insulating and sheathing materials for cables Part 2: Elastomeric sheathing compounds Section 2.6: Sheathing compounds for ships wiring and offshore applications. BS EN 60811-1-1, Insulating and sheat

33、hing materials of electric cables Common test methods Part 1: General application Section 1.1: Measurement of thickness and overall dimensions Tests for determining the mechanical properties. BS EN 60811-1-2:1995, Insulating and sheathing materials of electric cables Common test methods: Part 1: Gen

34、eral application Section 1.2: Thermal ageing methods. BS EN 10257-1, Zinc or zinc alloy coated non-alloy steel wire for armouring either power cables or telecommunication cables Part 1: Land cables. BS EN 12166:1998, Copper and copper alloys Wire for general purposes. IEC 331:1970, Fire resisting ch

35、aracteristics of electric cables. 3 Terms and definitions For the purposes of this British Standard the terms and definitions given in BS 4727-2:Group 08 and the following apply. 3.1 voltages 3.1.1 rated voltage reference voltage for which the cable is designed NOTE This is expressed as a combinatio

36、n of the values U 0 and U. 3.1.2 rated voltage U 0 nominal power-frequency voltage between conductor(s) and armour or earth for which the cable is suitable 3.1.3 rated voltage U nominal power-frequency voltage between phase conductors for which the cable is suitable 3.1.4 maximum voltage U m maximum

37、 sustained power-frequency voltage between phase conductors, for which the cable is suitable NOTE The values of U m for the relevant range are given in Table A.1. 3.2 cable types 3.2.1 individually screened pair, triple or quad cable cable in which each individual pair triple or quad is surrounded b

38、y an earthed metallic layer to confine the electric field and to limit the external electrical influences 3.2.2 collectively screened pair, triple or quad cable cable in which all pairs, triples or quads are surrounded by an earthed metallic layer to confine the electric field and to limit the exter

39、nal electrical influences2 BSI 06-1999 BS 7917:1999 3.3 values 3.3.1 nominal value value by which a quantity is designated and which is often used in tables NOTE In this standard, nominal values usually give rise to values to be checked by measurements taking into account specified tolerances. 3.3.2

40、 approximate value value which is only indicative NOTE In this standard, values described as “approximate” do not constitute requirements to be checked by measurements. 3.4 fire resistance (limited circuit integrity) ability of a cable to maintain circuit integrity for a stated period of time and un

41、der conditions as defined in a standard test NOTE The designation “fire resistant” given to a cable implies that it fulfils the requirements of the relevant standard fire resistance test 3.5 tests 3.5.1 type tests (symbol T) tests made before supplying, on a general commercial basis, a type of cable

42、 covered by this standard, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE These tests are such that, after they have been made, they need not be repeated unless changes are made in the cable material, design or manufacturing process which might

43、 change the performance characteristics. 3.5.2 sample tests (symbol S) tests made by the manufacturer on samples of completed cable, or components taken from a completed cable, so as to verify that the finished product meets the specified requirements 3.5.3 routine tests (symbol R) tests made by the

44、 manufacturer on each manufactured length of cable to check that the whole of each length meets the specified requirements 3.5.4 tests after installation tests intended to demonstrate the integrity of the cable and its accessories as installed 4 Designation of cables 4.1 Voltage designation Every ca

45、ble shall be designated by the rated voltages U 0 and U expressed in the form U 0 /U. The rated voltages recognized for the purposes of this standard shall be 150/250 V, 600/1 000 V, 1 900/3 300 V and 3 300/3 300 V. 4.2 Cable designation 4.2.1 Cables shall be designated according to the type of oute

46、r sheath material used in their construction as follows. Type SW 2. Cables with an outer sheath material conforming to BS 7655-2.6:1993, type SW 2, heavy duty enhanced oil-resisting, flame retardant with reduced halogen gas emission. Type SW 3. Cables with an outer sheath material conforming to BS 7

47、655-2.6:1993, type SW 3, ordinary duty oil-resisting with low emission of smoke and corrosive gases when affected by fire. Type SW 4. Cables with an outer sheath material conforming to BS 7655-2.6:1993, type SW 4, ordinary duty enhanced oil-resisting with low emission of smoke and corrosive gases wh

48、en affected by fire. 4.2.2 In addition, the cables shall be further designated according to their fire resistance (limited circuit integrity) performance characteristics as follows: F0: Fire resistance for 3 h at 7508C; F1: Fire resistance for 3 h at 9508C. NOTE Attention is drawn to the fact that t

49、he ability of a given cable to meet a particular category in this standard refers only to the test condition stated, and the level of performance achieved in a particular installation may be influenced by actual installation conditions. 5 General requirements 5.1 Construction and dimensions The construction and dimensions of the cables shall be as specified in the appropriate construction table (Tables 6 to 15 or Tables 19 to 34, as applicable). NOTE