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 quarriesBS 6708 : 1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes i
3、nto 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 96-08-01 ISBN 0 580 28651 7 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The
4、preparation of this British Standard was entrusted by Technical Committee MRE/3, Mining Electrical Equipment, to Subcommittee MRE/3/1, Cables and their connections, upon which the following bodies were represented: Association of British Mining Equipment Companies British Cable Makers Confederation
5、Health and Safety Executive Quarry Products AssociationBS 6708 : 1998 BSI 1998 i Contents Page Committees responsible Inside front cover Foreword iv 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Abbreviations 2 5 Voltage designation 2 6 Cables with individual metallic screens, rated voltage 6
6、40/1100 V, 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) 2 7 Cables with galvanized steel pliable wire armouring, rated voltages up to 1900/3300 V (types 20, 21, 62, 63, 64,
7、70, 71, 201, 211, 321 and 331) 13 8 Cables 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 9 Cables with galvanized steel pliable wire armouring having individual metallic screened or unscreened cores, r
8、ated voltage 3800/6600 V (types 621, 630 and 631) 29 10 Cable with individual metallic screens, rated voltage 600/1000 V, for use with drills (type 44) 34 11 Cable with individual non-metallic screens, rated voltage 600/1000 V, for use with drills (type 43) 36 12 Cable with individual metallic scree
9、ned cores, non-armoured, rated voltage 3800/6600 V (type 730) 38 13 Cable with metallic screened cores, non-armoured, rated voltage 6350/11000 V (type 830) 39 14 Cables with individual metallic screens, rated voltage 1900/3300 V, for use with coalface cutters and for similar purposes (types 307, 307
10、M and 307S) 44 Annexes A (informative) Approved codes of practice and conductivities 51 B (informative) Recommended current ratings 51 C (informative) Short circuit current carrying capability of flexible cable screens 52 D (normative) Measurement of insulation and sheath thickness 55 E (normative)
11、Protective screens: form, method of application and material 56 F (normative) Voltage and insulation resistance tests 57 G (normative) Tests for galvanized steel wire taken from completed cables 58 H (normative) Electrical test for conducting elastomeric screen for type 43 cable 58 Tables 1 Clause 6
12、 cable types and construction 3 2 Sequence of colours 4 3 Constructional details of type 7 cable 6 4 Constructional details of type 7M cable 7 5 Constructional details of type 7S cable 8 6 Constructional details of type 11 cable 9 7 Constructional details of type 14 cable 10BS 6708 : 1998 ii BSI 199
13、8 Page 8 Constructional details of type 16 cable 11 9 Constructional details of type FS4 cable 12 10 Insulation resistance 13 11 Clause 7 cable types and construction 14 12 Core identification 16 13 Minimum wire diameters 17 14 Constructional details of type 20 cable 18 15 Constructional details of
14、type 21 cable 19 16 Constructional details of cable types 62, 63, 64, 70 and 71 20 17 Constructional details of type 201 cable 21 18 Constructional details of type 211 cable 22 19 Constructional details of type 321 cable 23 20 Constructional details of type 331 cable 24 21 Test voltage on core 25 22
15、 Insulation resistance 25 23 Test voltage on completed cable 25 24 Constructional details of cable types 506, 512, 518 and 524 27 25 Clause 9 cable types and construction 30 26 Constructional details of type 621 cable 31 27 Constructional details of type 630 cable 32 28 Constructional details of typ
16、e 631 cable 33 29 Insulation resistance 34 30 Clause 10 cable type and construction 34 31 Constructional details for type 44 cable 35 32 Clause 11 cable type and construction 36 33 Constructional details for type 43 cable 38 34 Clause 12 cable type and construction 38 35 Constructional details of ty
17、pe 730 cable 40 36 Insulation resistance 41 37 Clause 13 cable type and construction 41 38 Constructional details of type 830 cable 43 39 Insulation resistance 43 40 Clause 14 cable types and construction 44 41 Constructional details of type 307 cable 47 42 Constructional details of type 307M cable
18、48 43 Constructional details of type 307S cable 49 44 Insulation resistance 50 A.1 Cables with conductivities of between 50 % and 99 % 51 B.1 Current ratings of cables of clauses 6, 7, 9, 10, 11, 12, 13 and 14 52 B.2 Current ratings for cables of clause 8 52 B.3 Current de-rating factors 52 B.4 Volt
19、age drop and current rating 52 C.1 Short circuit current ratings 53 E.1 Protective screenbraid thickness and width 57 BSI 1998 iii BS 6708 : 1998 Page Figures 1 Core identification: type 506 cable 27 2 Core identification: type 512 cable 28 3 Core identification: type 518 cable 28 4 Core identificat
20、ion: type 524 cable 28 D.1 Positions for first measurement of insulation thickness 55 D.2 Position of point of intersection of the cross-wires of the measuring microscope 55 D.3 Position for measurement of sheath thickness 55 D.4 Position for measurement of sheath thickness for type FS4 cable 56 D.5
21、 Position of point of intersection of the cross-wires of the measuring microscope 56 List of references Inside back coveriv 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. It updates insulation
22、specifications and short circuit current ratings, and now includes a section covering cable types 307, 307M and 307S for rated voltages of 1900/3300 V and having individual metallic screens. All matters relating to the use of electric cables in mines and quarries are now included in the Electricity
23、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 Safety at Work etc. Act 19
24、74 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 British Standard does no
25、t 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. BSI 1998 1 BS 6708 : 1998 1 Scope This British Standard specifies requirements and dimensions for fl
26、exible cables used in mining and quarrying. Specific types of cable covered in this standard are as follows: a) non-armoured 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
27、 16; 2) in overhead catenary systems and similar applications: types FS4 (flat form cable); b) cables with galvanized 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
28、640/1100 V used primarily for remote control circuits and coalface lighting: types 62, 63, 64, 70 and 71; or 3) individually 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 exte
29、nsion purpose: types 321 and 331; c) auxiliary cables with galvanized steel pliable wire armouring having up to 24 individually 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 au
30、xiliary equipment is required: types 506, 512, 518 and 524; d) cables with galvanized steel pliable wire armouring having 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 a
31、nd 631; e) non-armoured cable having individually metallic screened cores and a rated voltage 600/1000 V, primarily for 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
32、 hand-held drilling machines in mines: type 43; g) non-armoured cable having individually metallic screened cores and 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 ra
33、ted voltage 6350/11000 V, primarily for use as trailing cables for large machines at quarries: type 830; i) non-armoured 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. Infor
34、mation on approved codes of practice and conductivities related to the cables in this standard is given in annex A. NOTE 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 B
35、ritish Standard incorporates, by dated or undated reference, provisions from other publications. These normative references 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 subsequ
36、ent amendments to or revisions of a cited publication apply to this British Standard only when incorporated in the text 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
37、Standard, the definitions given in BS 4727 apply, together with the following. NOTE. Unless otherwise specified, voltages and currents are expressed by their r.m.s. values. 3.1 rated voltage U 0 The powerfrequency voltage to earth for which the cable is designed. NOTE. It is assumed that cables may
38、be operated continuously at a powerfrequency voltage 10 % above the rated voltage. 3.2 rated voltage U The powerfrequency 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.
39、 3.3 flexible cable Cable designed to be moved while energized. 3.4 trailing cable Cable used to supply apparatus that 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
40、. NOTE. When the conductor consists of more than one layer, alternate layers are twisted in opposite directions.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 same lay throughout. 3.8 multiple stranded con
41、ductor 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 metallic screen Braid enclosing the insulation of
42、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 in this standard: PCP: polychloroprene; ETFE: e
43、thylenetetrafluoroethylene. 5 Voltage designation The cable shall be designated by the rated voltages U 0 and U expressed in the form U 0 /U. NOTE. The rated voltages recognized for the purposes of this British Standard are 320/550 V, 600/1000 V, 640/1100 V, 1900/3300 V, 3800/6600 V and 6350/11000 V
44、. 6 Cables with individual metallic screens, rated voltage 640/1100 V , 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 cable Cable types and construction shall be
45、 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 for conductors of 16 mm 2 and larger. Size
46、s below 16 mm 2 shall 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 manufactur
47、ers 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. 6.3 Insulation The core insulation shall be a close fit on the cond
48、uctor without adhering, and shall be either type FR1 conforming to BS 7655 : Section 1.5 or type GP4 conforming to BS 7655 : Section 1.2, except that the tensile stress at 100 % elongation for GP4 shall be 2.0 N/mm 2 minimum. For type 7 and type 14 cables, an additional layer of insulation shall be
49、applied to the earth core and to the pilot core, as appropriate, of a thickness such that the finished outside diameters of the cores are the same as that of a screened power core. The additional layer of insulation on the pilot conductor shall be readily separable from the primary insulation. NOTE 1. For the earth core, the additional layer of insulation may be separable from the primary insulation or, alternatively, the insulation may be applied in a homogeneous layer. NOTE 2. If insulation colouring is used for identification purposes, it may be restricted to
