In the electrical circuit diagrams, the cables are marked with letters indicating the colour of the individual cables.
The designation consists of one or two letters as an abbreviation of the English word for the colour in question (except black). Multi-coloured cables are designated with combinations of these abbreviations separated by a hyphen or slash.
Example: A blue-yellow cable is designated BL-Y or BL/Y.
| Colour code | ||
| SB | Black | Schwarz | Noir |
| BL | Blue | Blau | Bleu |
| BR oder BN | Brown | Braun | Brun |
| GN | Green | Grün | Vert |
| GR | Grey | Grau | Gris |
| OR | Orange | Orange |
| P | Pink | Rosa |
| R | Red | Rot | Rouge |
| V | Violet | Violett |
| W | White | Weiss | Blanc |
| Y | Yellow | Gelb | Jaune |
| W-SB | White-Black | Weiss-Schwarz | Blanc-Noir |
| W-GN | White-Green | Weiss-Grün | Blanc-Vert |
| BL-R | Blue-Red | Blau-Rot | Bleu-Rouge |
| BL-W | Blue-White | Blau-Weiss | Bleu-Blanc |
| BL-Y | Blue-Yellow | Blau-Gelb | Bleu-Jaune |
| GN-R | Green-Red | Grün-Rot | Vert-Rouge |
