Cores Identification
Insulation Colour Scheme
MV cables
| Single core |
Natural colour of the compound |
| Three core |
Coloured tape or thread (e.g.: red – yellow – blue) |
0.6/1 kV Power and Control Cables
| According to BS 6883/BS 7917 |
Alternatives |
| 1 core |
Red or Black |
White and numbered |
| 2 cores |
Red – Black |
White and numbered |
| 3 cores |
Red – Yellow – Blue |
White and numbered |
| 4 cores |
Red – Yellow – Blue – Black |
White and numbered |
| Above 4 cores |
black numbers on white background |
|
150/250 V Instrumentation Cables
| Pair |
Black – White |
| Triple |
Black – White – Red |
| Quad |
Black – White – Red – Blue |
| Pairs/Triples/Quads are numbered with numbers printed directly on the insulated conductors (1-1; 2-2; …) or buy numbered tape |
Outer Sheath Standard Colours
| MV power and control |
Red |
| LV power and control |
Black |
| Instrumentation and control |
Grey |
| Other colours available on request |
|