Colour coding of 3 phase AC circuits - Page 2 - Electrician Talk - Professional Electrical Contractors Forum
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Old 07-10-2019, 07:23 PM   #21
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Originally Posted by just the cowboy View Post
We had three different voltages in my building. It was an older building that was built when RED was still L2 high leg.

Brown.Orange Yellow= 480 volts
Black, Red, Blue. = 240 Volts
Black w/ red stripe, Red w/ Blue stripe, Blue w/ Black stripe. = 208 Volts

In the US it just says it must be identified different for each voltage.
In the older Terminal-1, garage, concourses A, B and C it is all 208v for the secondary(primary is 4160v) with some 480v added later. In the newer Terminal-2, Garage, Concourses D, E and the "C" extension has no 208v at all. When a contract goes out for bid, we ask that "Brown, Orange, Yellow and Gray" be used for 480v and "Black, Red, Blue and White" be used for 208v. There are a few exceptions, because no-one bothered to inspect the work being done. FPN; in the areas built before 1960, I have found "Green" wire used as a switch leg, must have been considered the same as "Black, Red, or Blue" back in the day.
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Old 07-11-2019, 12:34 AM   #22
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We should have a code like that. Most of our commercial buildings do have different voltages.
Try adding in one more with a different frequency too.. Utility and emergency feeds, multiple voltages, we'd need a box a 64 crayons to mark some of them up! lol..
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Old 07-11-2019, 09:48 PM   #23
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Try adding in one more with a different frequency too.. Utility and emergency feeds, multiple voltages, we'd need a box a 64 crayons to mark some of them up! lol..
Anyone work at the airport if ya ran into 400 HZ ground power units for aircrafts that will get your attention if you ever get one of common 60 HZ motor hook up to that source .,, they will scream with super high speed lol.,,

But yuh most case it useally clearly marked but once a while ya get a dumb turkey mess it up.
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