Transformer color codes 3 wire7/28/2023 ![]() In service equipment: "A" = Black, "B" = Blue, "C" = Orange (the High Voltage Line) There is a "commonly used color code" that's used in the trade, which Tom has described also.įor 1 phase 3 wire, Black would be for Line "A", Red for Line "B", White for the Grounded Neutral. Other than the listed Conductors above, the NEC doesn't care if you used a conductor with cute little polka dots on a Black/Pink/Purple Tie Dye colored insulation Lastly, the High Voltage line on a 4 wire delta is to be Orange. ![]() It only requires Grounded Conductors to be either White or Gray ,Įquipment Grounding Conductors to be Green, Green w/ yellow threads (yellow stripes) - commonly used for Isolated Grounds, or can be bare. Īs Tom has explained, there's no real color code in the NEC. It's funny to see the reaction of people when you throw that one at them! There's this puzzled look and a temporary loss of words, but I clue them into the joke before disaster sets in. I am just playing around here - by no means am I flaming you Tom! It's just a joke that I use on the job to see if someone is listening to me or just blowing sunshine up my butt.īelieve it or not, I have gotten a few responses that agreed with the bogus theory.and they were serious!!! Wooo.scarry. Sure it does!!! The Electrons will only flow through a color coded conductor ![]() These coloring schemes don't make the system work one bit better.
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