The conductors in a power distribution system are color coded according to the standard in use in the country in which the system is built, installed, or used. In the United States the only color codes designated by the NEC are white for neutral and green, green with yellow stripes, or bare copper wire for the grounding wire. There are no designated colors for the phase conductors, but standard practice is for phase A to be black, phase B to be red, and phase C to be blue. The sole exception is that the high-leg conductor of a 120/240 four-wire delta-connected system is orange. The entertainment production industry is fairly rigid in practice, and most three-phase four-wire plus ground systems follow the unwritten standard ...
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