I had a job adding a 480 volt service to a building and used Yellow Brown Purple because I was re-feeding the old delta service that I used Black Orange Blue. The Fulton county inspector would not pass me until I changed it to Brown Orange Yellow. His reasoning was that because the other color code was common, an electrician coming in behind me would get confused.Locally it's Brown, Purple , Yellow.
Our largest municipality has a local rule restricting Orange to High-Leg.
The industry norm is to use brown/orange/yellow, unless a local standard governs otherwise. The NEC doesn't enforce this standard, but it's the norm people follow. Some local jurisdictions strictly limit orange to the high leg, and thus violet is used for the B phase of a 277/480V system. Chances are, it really isn't necessary to avoid orange if the AHJ allows it, because if you have a 277/480V service, it's very unlikely to have a high leg anywhere on the property. Most big ticket loads would use the 277/480V system anyway.When do you use brown orange yellow? And when do you use brown purple yellow? Thank you for your help.
It is an older one, there is a saying to remember the sequence, but is not really politically correct to say on here. Don’t know why it was flipped around when the newer color code came out, maybe because “BOY” was easy to remember.Always been BOY here, never seen it the other way ever. But I have seen reference to it. The OP says BPY but I always thought it was BYP. Post 2 is YBP. Which is it really? I guess it sounds like an older color code.
Thats interesting I think of it as unique sets not unique individual colors. If you just go by individual colors you run out of colors really quick.Since most of them used color coding to meet the requirements of 210.5, the requirement for high-leg to be orange caused conflicted with orange having been used with the 480 system.
There is a few industrial sites here like that where the voltage is tagged or marked on enclosures, color is only used to indicate phase.There is an old Walmart in Covington Georgia, that everything is Black Red Blue, 120,208,277 and 480.