BS 6708:1998

Committees responsible
Foreword
1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Voltage designation
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)
7 Cables with galvanized steel pliable wire armouring, rated
    voltages up to 1900/3300 V (types 20, 21, 62, 63, 70, 71,
    201, 211, 321 and 331)
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)
9 Cables with galvanized steel pliable wire armouring having
    individual metallic screened or unscreened cores, rated
    voltage 3800/6600 V (types 621, 630 and 631)
10 Cable with individual metallic screens, rated voltage
    600/1000 V, for use with drills (type 44)
11 Cable with individual non-metallic screens, rated voltage
    600/1000 V, for use with drills (type 43)
12 Cable with individual metallic screened cores, non-armoured
    rated voltage 3800/6600 V (type 730)
13 Cable with metallic screened cores, non-armoured, rated
    voltage 6350/11000 V (type 830)
14 Cables with individual metallic screens, rated voltage
    1900/3300 V, for use with coalface cutters and for
    similar purposes (types 307, 307M and 307S)
Annexes
A (informative) Approved codes of practice and conductivities
B (informative) Recommended current ratings
C (informative) Short circuit current carrying capability
    of flexible cable screens
D (normative) Measurement of insulation and sheath thickness
E (normative) Protective screens: form, method of application
    and material
F (normative) Voltage and insulation resistance tests
G (normative) Tests for galvanized steel wire taken from
    completed cables
H (normative) Electrical test for conducting elastomeric
    screen for type 43 cable
Tables
1 Clause 6 cable types and construction
2 Sequence of colours
3 Constructional details of type 7 cable
4 Constructional details of type 7M cable
5 Constructional details of type 7S cable
7 Constructional details of type 14 cable
8 Constructional details of type 16 cable
9 Constructional details of type FS4 cable
10 Insulation resistance
11 Clause 7 cable types and construction
12 Core identification
13 Minimum wire diameters
14 Constructional details of type 20 cable
15 Constructional details of type 21 cable
16 Constructional details of cable types 62, 63, 64, 70
    and 71
17 Constructional details of type 201 cable
18 Constructional details of type 211 cable
19 Constructional details of type 321 cable
20 Constructional details of type 331 cable
21 Test voltage on completed cable
22 Insulation resistance
23 Test voltage on completed cable
24 Constructional details of cable types 506, 512, 518 and
    524
25 Clause 9 cable types and construction
26 Constructional details of type 621 cable
27 Constructional details of type 630 cable
28 Constructional details of type 631 cable
29 Insulation resistance
30 Clause 10 cable type and construction
31 Constructional details for type 44 cable
32 Clause 11 cable type and construction
33 Constructional details for type 43 cable
34 Clause 12 cable type and construction
35 Constructional details of type 730 cable
36 Insulation resistance
37 Clause 13 cable type and construction
38 Constructional details of type 830 cable
39 Insulation resistance
40 Clause 14 cable types and construction
41 Constructional details of type 307 cable
42 Constructional details of type 307M cable
43 Constructional details of type 307S cable
44 Insulation resistance
    A.1 Cables with conductivities of between 50% and 99%
    B.1 Current ratings for cables of clauses 6, 7, 9, 10,
          11, 12, 13 and 14
    B.2 Current ratings for cables of clause 8
    B.3 Current de-rating factors
    B.4 Voltage drop and current rating
    C.1 Short circuit current ratings
    E.1 Protective screenbraid thickness and width
Figures
1 Core identification: type 506 cable
2 Core identification: type 512 cable
3 Core identification: type 518 cable
4 Core identification: type 524 cable
    D.1 Positions for first measurement of insulation
         thickness
    D.2 Position of point of intersection of the cross-wires
         of the measuring microscope
    D.3 Position for measurement of sheath thickness
    D.4 Position for measurement of sheath thickness for
         type FS4 cable
    D.5 Position of point of intersection of the cross-wires
         of the measuring microscope
List of references
 

Specifies flexible cable types, their electrical characteristics, construction, identification and testing.

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: non-armoured cables having individually metallic screened cores and a rated voltage of 640/1100 V, for use: with coalface cutters and other similar machines: types 7, 7M, 7S, 11, 14 and 16; in overhead catenary systems and similar applications: types FS4 (flat form cable); cables with galvanized steel pliable wire armouring, with: unscreened cores and a rated voltage 640/1100 V: types 20 and 21; or 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 individually metallic screened cores and a rated voltage 640/1100 V: types 201 and 211; or a rated voltage 1900/3300 V used as trailing cables in quarries or for mine roadway cable extension purpose: types 321 and 331; 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 auxiliary equipment is required: types 506, 512, 518 and 524; 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 and 631; 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; 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; 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; 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; 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. Information 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.