I seem to vaguely remember one of the 70's editions of the Code having a color code requirement. That's when engineers began specifying the Br/Or/YL for 480V circuits and Blk/Rd/Blu for 208V circuits. And the phasing was to following throughout. Maybe it was the 72 Code?? And a lot of specifications still have that requirement, because mangagement didn't want to spend the money to get them updated.(and still won't)
