HD308 S2 ( BS7671) European Harmonised colour code 
| Table 1: Cables and cords with a green/yellow core | |
| 3 core: | Green/yellow, blue, brown |
| 4 core: | Green/yellow, brown, black, grey |
| 4 core*: | Green/yellow, blue, brown, black |
| 5 core: | Green/yellow, blue, brown, black, grey |
| * For certain applications only | |
Table 2: Cables and cords without a green/yellow core |
|
| 2 core: | Blue, brown |
| 3 core: | Brown, black, grey |
| 3 core*: | Blue, brown, black |
| 4 core: |
Blue, brown, black, grey |
| 5 core: | Blue, brown, black, grey, black |
| * For certain applications only In these tables an uninsulated concentric conductor such as a metallic sheath, armour or screen wire are not regarded as a core. A concentric conductor is identified by its position and therefore need not be identified by colour. |
|