| no. of conductors | cables with green-yellow earth wire | cables without green-yellow earth wire |
| 1-conductor | - | nature |
| 2-conductors | – | blue - brown |
| 3-conductors | green-yellow - blue - brown | brown - black - gray |
| 4-conductors | green-yellow - brown - black - gray | blue - brown - black - gray |
| 5-conductors | green-yellow - blue - brown - black - gray | blue - brown - black - gray - black |
| 6-conductors | green-yellow - black conductors numbered | black conductors numbered |
