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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6708 : 1998 ICS 29.060
2、.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Flexible cables for use at mines and quarries Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Jul 10 17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 6708 : 1998 This British Standard, havi
3、ng been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 BSI 1998 The following BSI references relate to the work on this standard: Committee reference MRE/3/1 Announced in BSI Update 96-08-0
4、1 ISBN 0 580 28651 7 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee MRE/3, Mining Electrical Equipment, to Subcommittee MRE/3/1, Cables and their connections,
5、 upon which the following bodies were represented: Association of British Mining Equipment Companies British Cable Makers Confederation Health and Safety Executive Quarry Products Association Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Jul 10 17:01:14 GMT+00:00 2007
6、, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BS 6708 : 1998 BSI 1998i Contents Page Committees responsibleInside front cover Forewordiv 1Scope1 2Normative references1 3Definitions1 4Abbreviations2 5Voltage designation2 6Cables with individual metallic screens, rated voltage 640/1100 V, for
7、 use with coalcutters and for similar purposes (types 7, 7M, 7S, 11, 14 and 16) and flat cables for use on overhead catenary systems and for similar purposes (type FS4)2 7Cables with galvanized steel pliable wire armouring, rated voltages up to 1900/3300 V (types 20, 21, 62, 63, 64, 70, 71, 201, 211
8、, 321 and 331)13 8Cables with galvanized steel pliable wire armouring having up to 24 individual screened cores, rated voltage 320/550 V (types 506, 512, 518 and 524)26 9Cables with galvanized steel pliable wire armouring having individual metallic screened or unscreened cores, rated voltage 3800/66
9、00 V (types 621, 630 and 631)29 10Cable with individual metallic screens, rated voltage 600/1000 V, for use with drills (type 44)34 11Cable with individual non-metallic screens, rated voltage 600/1000 V, for use with drills (type 43)36 12Cable with individual metallic screened cores, non-armoured, r
10、ated voltage 3800/6600 V (type 730)38 13Cable with metallic screened cores, non-armoured, rated voltage 6350/11000 V (type 830)39 14Cables with individual metallic screens, rated voltage 1900/3300 V, for use with coalface cutters and for similar purposes (types 307, 307M and 307S)44 Annexes A(inform
11、ative) Approved codes of practice and conductivities51 B(informative) Recommended current ratings51 C(informative) Short circuit current carrying capability of flexible cable screens52 D(normative) Measurement of insulation and sheath thickness55 E(normative) Protective screens: form, method of appl
12、ication and material56 F(normative) Voltage and insulation resistance tests57 G(normative) Tests for galvanized steel wire taken from completed cables58 H(normative) Electrical test for conducting elastomeric screen for type 43 cable58 Tables 1Clause 6 cable types and construction3 2Sequence of colo
13、urs4 3Constructional details of type 7 cable6 4Constructional details of type 7M cable7 5Constructional details of type 7S cable8 6Constructional details of type 11 cable9 7Constructional details of type 14 cable10 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Jul 10
14、17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BS 6708 : 1998 ii BSI 1998 Page 8Constructional details of type 16 cable11 9Constructional details of type FS4 cable12 10Insulation resistance13 11Clause 7 cable types and construction14 12Core identification16 13Minimum w
15、ire diameters17 14Constructional details of type 20 cable18 15Constructional details of type 21 cable19 16Constructional details of cable types 62, 63, 64, 70 and 7120 17Constructional details of type 201 cable21 18Constructional details of type 211 cable22 19Constructional details of type 321 cable
16、23 20Constructional details of type 331 cable24 21Test voltage on core25 22Insulation resistance25 23Test voltage on completed cable25 24Constructional details of cable types 506, 512, 518 and 52427 25Clause 9 cable types and construction30 26Constructional details of type 621 cable31 27Construction
17、al details of type 630 cable32 28Constructional details of type 631 cable33 29Insulation resistance34 30Clause 10 cable type and construction34 31Constructional details for type 44 cable35 32Clause 11 cable type and construction36 33Constructional details for type 43 cable38 34Clause 12 cable type a
18、nd construction38 35Constructional details of type 730 cable40 36Insulation resistance41 37Clause 13 cable type and construction41 38Constructional details of type 830 cable43 39Insulation resistance43 40Clause 14 cable types and construction44 41Constructional details of type 307 cable47 42Construc
19、tional details of type 307M cable48 43Constructional details of type 307S cable49 44Insulation resistance50 A.1Cables with conductivities of between 50 % and 99 %51 B.1Current ratings of cables of clauses 6, 7, 9, 10, 11, 12, 13 and 1452 B.2Current ratings for cables of clause 852 B.3Current de-rati
20、ng factors52 B.4Voltage drop and current rating52 C.1Short circuit current ratings53 E.1Protective screenbraid thickness and width57 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Jul 10 17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BSI
21、1998iii BS 6708 : 1998 Page Figures 1Core identification: type 506 cable27 2Core identification: type 512 cable28 3Core identification: type 518 cable28 4Core identification: type 524 cable28 D.1Positions for first measurement of insulation thickness55 D.2Position of point of intersection of the cro
22、ss-wires of the measuring microscope55 D.3Position for measurement of sheath thickness55 D.4Position for measurement of sheath thickness for type FS4 cable56 D.5Position of point of intersection of the cross-wires of the measuring microscope56 List of referencesInside back cover Licensed Copy: Insti
23、tute Of Technology Tallaght, Institute of Technology, Tue Jul 10 17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m iv BSI 1998 BS 6708 : 1998 Foreword This British Standard has been prepared by Technical Committee MRE/3/1. It supersedes BS 6708 : 1991 which is withdrawn.
24、It updates insulation specifications and short circuit current ratings, and now includes a section covering cable types 307, 307M and 307S for rated voltages of 1900/3300 Vand having individual metallic screens. All matters relating to the use of electric cables in mines and quarries are now include
25、d in the Electricity at Work Regulations 1989 1 and the associated Health and Safety Executive (HSE) Approved Codes of Practice, i.e. The use of electricity in mines (COP 34) 2 and The use of electricity at quarries (COP 35) 3. Guidance is given in annex A. Attention is drawn to the Health and Safet
26、y at Work etc. Act 1974 4, the Mines and Quarries Act 1954 5, the regulations made under these, and also any other appropriate statutory requirements or by-laws. These place responsibility for complying with certain specific safety requirements on the manufacturer and the user. Compliance with a Bri
27、tish 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 to iv, pages 1 to 58, an inside back cover and a back cover. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue J
28、ul 10 17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BSI 19981 BS 6708 : 1998 1 Scope This British Standard specifies requirements and dimensions for flexible cables used in mining and quarrying. Specific types of cable covered in this standard are as follows: a) non-a
29、rmoured cables having individually metallic screened cores and a rated voltage of 640/1100 V, for use: 1) with coalface cutters and other similar machines: types 7, 7M, 7S, 11, 14 and 16; 2) in overhead catenary systems and similar applications: types FS4 (flat form cable); b) cables with galvanized
30、 steel pliable wire armouring, with: 1) unscreened cores and a rated voltage 640/1100 V: types 20 and 21; or 2) individually metallic screened or unscreened cores and a rated voltage 640/1100 V used primarily for remote control circuits and coalface lighting: types 62, 63, 64, 70 and 71; or 3) indiv
31、idually metallic screened cores and a rated voltage 640/1100 V: types 201 and 211; or 4) a rated voltage 1900/3300 V used as trailing cables in quarries or for mine roadway cable extension purpose: types 321 and 331; c) auxiliary cables with galvanized steel pliable wire armouring having up to 24 in
32、dividually metallic screened cores and a rated voltage 320/550 V, primarily for use on large mining machines where interconnection between machine sections or a machine section and auxiliary equipment is required: types 506, 512, 518 and 524; d) cables with galvanized steel pliable wire armouring ha
33、ving individually metallic screened or unscreened cores and a rated voltage 3800/6600 V, used as trailing cables in quarries and rated for roadway extension purposes: types 621, 630 and 631; e) non-armoured cable having individually metallic screened cores and a rated voltage 600/1000 V, primarily f
34、or use with hand-held drilling machines in mines: type 44; f) non-armoured cable having individually non-metallic screened cores and a rated voltage 600/1000 V, primarily for use with hand-held drilling machines in mines: type 43; g) non-armoured cable having individually metallic screened cores and
35、 a rated voltage 3800/6600 V, primarily for use as trailing cables for large machines at quarries: type 730; h) non-armoured cable having individually metallic screened cores and a rated voltage 6350/11000 V, primarily for use as trailing cables for large machines at quarries: type 830; i) non-armou
36、red cables having individually metallic screened cores and rated voltage 1900/3300 V, for use with coalface cutters and other similar machines: types 307, 307M and 307S. NOTE 1. Information on approved codes of practice and conductivities related to the cables in this standard is given in annex A. N
37、OTE 2. Recommended current ratings are given in annex B. NOTE 3. Short circuit current carrying capability of flexible cable screens is given in annex C. 2 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. These normative refe
38、rences are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of a cited publication apply to this British Standard only when incorporated in the te
39、xt by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 3 Definitions For the purposes of this British Standard, the definitions given in BS 4727 apply, together with the following. NOTE. Unless otherwise specified, volt
40、ages and currents are expressed by their r.m.s. values. 3.1 rated voltage U0 The powerfrequency voltage to earth for which the cable is designed. NOTE. It is assumed that cables may be operated continuously at a powerfrequency voltage 10 % above the rated voltage. 3.2 rated voltage U The powerfreque
41、ncy voltage between conductors for which the cable is designed. NOTE. It is assumed that cables may be operated continuously at a powerfrequency voltage 10 % above the rated voltage. 3.3 flexible cable Cable designed to be moved while energized. 3.4 trailing cable Cable used to supply apparatus that
42、 changes position while energized. 3.5 fixed cable Cable that does not change position while energized. 3.6 stranded conductor Conductor made up of a number of wires twisted together. NOTE. When the conductor consists of more than one layer, alternate layers are twisted in opposite directions. Licen
43、sed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Jul 10 17:01:14 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m 2 BSI 1998 BS 6708 : 1998 3.7 bunched conductor Stranded conductor in which all wires are twisted together in the same direction and with the
44、same lay throughout. 3.8 multiple stranded conductor Stranded conductor consisting of a number of groups of wires assembled together in one or more helical layers, the wires in each group being either bunched or stranded. 3.9 braid Plaited protective covering composed of a number of wires. 3.10 meta
45、llic screen Braid enclosing the insulation of each conductor. 3.11 non-metallic screen Conducting layer enclosing the insulation of each conductor. 3.12 core Single conductor and its insulation, but not including any mechanical protective cover. 4 Abbreviations The following abbreviations are used i
46、n this standard: PCP: polychloroprene; ETFE: ethylenetetrafluoroethylene. 5 Voltage designation The cable shall be designated by the rated voltages U0and U expressed in the form U0/U. NOTE. The rated voltages recognized for the purposes of this British Standard are 320/550 V, 600/1000 V, 640/1100 V,
47、 1900/3300 V, 3800/6600 V and 6350/11000 V. 6 Cables with individual metallic screens, rated voltage 640/1100V, for use with coalcutters and for similar purposes (types 7, 7M, 7S, 11, 14 and 16) and flat cables for use on overhead catenary systems and for similar purposes (type FS4) 6.1 Types of cab
48、le Cable types and construction shall be as given in table 1. Constructional details and dimensions shall be as given in tables 3 to 9. 6.2 Conductors The conductors shall be composed of round tinned annealed copper wires conforming to BS 6360 for class 5 conductors and shall be multiple stranded fo
49、r conductors of 16 mm2and larger. Sizes below 16 mm2shall be bunched. Joints made in the single wires forming the conductor shall be brazed, silver soldered or electrically welded. No joint shall be made in the conductor after it has been stranded. The conceptual construction shall be as given in tables 3 to 9. NOTE. At the manufacturers discretion, a film separator of polyethylene terephthalate or other suitable non-hygroscopic tape may be applied over the conductor. Embrittlement or discoloration of this tape after vulcanization of the core may be disregarded.