Color coding allows the Electrical engineer ETO to follow electrical circuits throughout a vessel without having to physically touch each cable.
The color can be continuous throughout the length of the conductor, or the color noun-nomenclature, such as red, is printed every 24 inches on the insulation of the conductor.
The following are color designations for distribution cables:
2 conductors – black, red, or white.
3 conductors – black, red, blue, or white.
4 conductors – black, red, blue, orange, or white. Older wire designations are as follows:
Phase A: black.
Phase B: white.
Phase C: red.
2 wire DC: positive (+) black. negative (-) white.
3 wire DC: positive (+) black. negative (-) red.