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208V 3-ph systems: L1 = BLACK L2 = RED L3 = BLUE N = WHITE PE = GREEN or GREEN/YELLOW. 480V 3-ph systems: L1 = BROWN L2 = ORANGE L3 = YELLOW N = GRAY PE = GREEN or GREEN/YELLOW. When I google standard wire colors in USA, it matches with this spec. So far so good.
wire colors for 480v. If the building has multi voltages 240/120 208/120 480/277. 240/120 and 208/120 is black, red, blue and white. 480/277 is Brown, orange, yellow and grey. Can you pull blue red black and white to a 480/277 panel. If not what code section.
480sparky said: I don't when I have just 208/480. But then again, I've never worked with 208/480 volt circuits. 'Round here, they're either 120/208 or 277/480. Then I use two color schemes. wasnt' talking about those circuits just 208 and 480 single phase. www.cletiselectric.com.
2049 posts · Joined 2007. #8 · Feb 27, 2012. When I started as an apprentice this is the reason that I was given for using Purple instead of orange for a 3 phase 480/277 volt system. Our typical color coding for 480/277 was Brown-yellow-purple. To this day that is the most common phasing for a 480 volt system in my area.
16077 posts · Joined 2009. #9 · May 5, 2010. John Valdes said: Not only are 600 volt systems up in Canada, they are all over the south right here in the USA. There are still a few remaining 600 volt systems in old mill and factory buildings here in New England, but they are 600 volt delta, not the 600/347 wye system that is used in Canada.
They have 3 phase delta 480. Not sure if that's the technical name or not. So on A phase to ground you have straight 480V. B phase to ground you have 0V. C phase to ground you have 480V. No neutral comming in. A to B 480v, A to C 480v and B to C 480V. I've been told that the B phase is called the grounding leg.
Blue, Black, Orange for 3 phase240/120 volt Delta. Brown, orange, yellow for 3 phase 480 / 277 wye. Since the NEC requires that the color coding be consistent throughout the building and marked on the panels, we should follow what the utility says.
Black Red & blue are my choice for lower voltage. An inspector once specified orange as the odd leg in three phase Delta. I'm uncomfortable with using orange for both 480 & 240. I choose blue for lower voltage. Code says I have to post color code in the electrical room. My opinion is BOY are 480, Bla, R Blu are 240 or 208. Bla R are 240 single ...
Apparently they were in a hurry and didnt have the black, red or blue type AC cable on hand. We normally use the brown orange colors for 277/480 circuits and black red blue for the 120 volt circuits. I know in the NEC it would allow you to reidentify a grounded conductor to be used as an ungrounded conductor 2008 NEC 200.7 (C).
3830 posts · Joined 2010. #2 · Aug 15, 2015. You only need two current transformers to monitor the power in a 3 phase, 3 wire system. I agree it appears to be a corner grounded system. As far as marking, I have never seen a corner grounded system where the grounded conductor was identified as required by the rules in 200.6.