400.22 Grounded-Conductor Identification(C) ... 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.
Re: Brown, blue, green w/yellow stripe elec wires#61400 01/23/0608:59 AM01/23/0608:59 AM
I see blue and yellow 120v circuits in many non-permit pipe jobs. My guess is Europians doing the work and no one told them we use white and grey. No one told them you shouldn't put #14's on a 30a breaker.