Originally posted by pauluk:
#2. 277/480V wiring.
I'm getting a little confused here. Phase colors on 120/208 are normally black/red/blue,
Right
but someone here said that on a single-phase branch you just use black, because a single-pole C/B could get moved to another phase so identifying the phase on a 1-ph branch would be pointless.
![[Linked Image]](https://www.electrical-contractor.net/ubb/confused.gif)
So..... Why then would you identify the phase on a 277V 1-ph branch from a 277/480V panel? Surely a single-pole 277V C/B could get moved to another phase as well? I'm puzzled.....
Around here the standard practice is to do 120 single phase branch circuits just like we described 277 single phase branch above. If you move it to a different circuit you change the color. The problem is the color doesn't usually get changed so if there is a lot of changes you end up with confusion.
