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 | |
