BS 6708:1998

This standard BS 6708:1998 Flexible cables for use at mines and quarries is classified in these ICS categories:

• 29.260.20 Electrical apparatus for explosive atmospheres
• 29.060.20 Cables
• 73.100.01 Mining equipment in general

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:

1. 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 16;

   2. in overhead catenary systems and similar applications: types FS4 (flat form cable);

2. 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 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 extension purpose: types 321 and 331;

3. 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;

4. 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;

5. 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;

6. 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;

7. 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;

8. 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;

9. 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.

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