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 |
