Joe, you got me there with 504.80(C), 647.4(C)! I just learned something! I like when that happens. (Seriously)

Grounds, neutrals, and high legs, those are all locked down. The light blue in 504.80, is a new one to me! And the heating cables, that's for the sheath of the cable for system identification, right?

The other ones you mentioned about phase arrangment, (ABC) and system/voltage identifcation, don't mention black, red, blue, or brown, orange yellow. We just know them to be that, as accepted pratice. I think it would be nice for the powers that be, to just come out and say it! [Linked Image]

Now, I'm not trying to start trouble. But switch legs, and travellers, shouldn't they be identified to the phase they're on? Futher still, I'm sure the count on fill, but do they count on derating?

Mark Heller
"Well - I oughta....." -Jackie Gleason