400.22 Grounded-Conductor Identification
Exception: In the case of Types C and PD and cords having the braids on the individual conductors finished to show white or gray. In such cords, the identifying marker shall be permitted to consist of the solid white or gray finish on one conductor, provided there is a colored tracer in the braid of each other conductor.
For jacketed cords furnished with appliances, one conductor having its insulation colored light blue, with the other conductors having their insulation of a readily distinguishable color other than white or gray.
Exception: Cords that have, insulation on the individual conductors integral with the jacket.
The insulation shall be permitted to be covered with an outer finish to provide the desired color.