Huh? [Linked Image]

No problem on the basic single-phase circuit colors, but let me see if I've got this straight for 3-phase:

#1. 3-ph 4-w plus ground

Phases = Black, blue, black
Neutral = Gray
Ground = Red

If you're going to identify the phases, identify all of them I say, but at least this is consistent with 1-ph on the neutral & ground colors.


#2. 3-ph 3-wire plus ground:

Phases = Black, red, blue
Ground = Gray

So gray suddenly changes from neutral to ground (or combined N-G), but red is now a phase? [Linked Image] [Linked Image]