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Old 06-21-2010, 04:57 PM   #21
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whats the color of the high leg of a 120/240 volt 3 phase 4 wire system?

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Old 06-21-2010, 05:16 PM   #22
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usually orange. this is the third time you asked in 1 hour. Do you own a codebook ? 110.15
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Old 06-21-2010, 05:34 PM   #23
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its not like the motor uses the 240 voltage to ground, when you are only using three phases and no neutra,l the voltage between any of them is the same
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Old 06-21-2010, 05:51 PM   #24
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usually orange. this is the third time you asked in 1 hour. Do you own a codebook ? 110.15
Yeah, Orange....BUT, I did this the other day and confused the hell out of the lineman....They are used to RED...I'd check with them also...Don't want to make the monkeys think.
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Old 06-22-2010, 09:23 PM   #25
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whats the color of the high leg of a 120/240 volt 3 phase 4 wire system?
I beleive the same as a 3 phase 3 wire high leg. Orange.
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Old 06-24-2010, 03:29 AM   #26
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Originally Posted by kolbychamberlain View Post
whats the color of the high leg of a 120/240 volt 3 phase 4 wire system?

The modern delta system in USA typically are orange however if you run into old delta system there are some case it will marked RED !!

So very simple rules always test with your voltmeter to verify if you have see red conductor but no orange conductor show up.

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Old 04-17-2013, 08:16 PM   #27
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Originally Posted by kolbychamberlain View Post
whats the color of the high leg of a 120/240 volt 3 phase 4 wire system?
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Originally Posted by wildleg View Post
usually orange. this is the third time you asked in 1 hour. Do you own a codebook ? 110.15
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I beleive the same as a 3 phase 3 wire high leg. Orange.

Ran into one of these in an area I would least expect it. The high leg was on the blue colored C phase. This was in a vault for an old condo complex for the pool equipment. There was no breaker Panel, just a feeder to a large can, and everything all motors taped off this !! 240V single phase motors for the pool equipt. Someone wrote on the J box cover Blue = High leg. I didn't even know this town had that service anywhere. There was a couple of county pump stations nearby, this may be why that service is available. Wondering how balanced the loads on there would be the way this was set up. I guess someone thought they could use the tap rule
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Old 04-17-2013, 08:28 PM   #28
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whats the color of the high leg of a 120/240 volt 3 phase 4 wire system?
Don't trust the color, trust your meter
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Old 04-17-2013, 08:33 PM   #29
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Don't trust the color, trust your meter
First time in a bit, I have run into this. But usually in industrial areas, not at the beach. You can damage a lot of single phase loads !
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Old 04-17-2013, 08:57 PM   #30
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Zombie thread
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Old 04-17-2013, 09:02 PM   #31
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Zombie thread
yes digging around in the archives
Seems like a lot of single phase 120V loads would unbalance this thing with people avoiding using the High leg.
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Old 04-17-2013, 10:44 PM   #32
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Before the code required the High Leg to be marked Orange it was always marked Blue. I have never seen a High Leg marked Red around here. We have a lot of Open Delta 3 phase services around here. The power Co. can get away with running 2 primary phases to a 3 phase location, use 2 pots and hook them up in an open delta config. Saves them 1 phase primary to an out of the way agricultural irrigation pump and they only have to size the power pot for the pump load, usually 1/2 of the lighting pot.

In heavy industrial locations the normal system is a Delta system. This uses all 3 primary phases and 3 pots all the same size. You can still center tap one pot on the secondary to produce a neutral for the secondary.
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Old 04-17-2013, 11:49 PM   #33
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yes digging around in the archives
Seems like a lot of single phase 120V loads would unbalance this thing with people avoiding using the High leg.
Basically it is a single phase house service (120/240) with a smaller third phase.
The poco can supply 120/240 3 wire single phase services (Houses) and 120/240 3 phase 4 wire service (Industrial/Commercial) with one set of pots.

Look for a large pot and one (open Delta) small pot or one large and two ( closed delta) small pots on the pole.

If all three pots are the same size most likely its a Y system, 120/208 or 277/480.
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Old 04-17-2013, 11:52 PM   #34
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usually orange. this is the third time you asked in 1 hour. Do you own a codebook ? 110.15
Your name is Wildleg. It is your job to answer those questions.
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Old 04-17-2013, 11:53 PM   #35
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Don't trust the color, trust your meter
I once was in an industrial facility where they had a 200 amp breaker box. If you open the box you notice that every other breaker was skipped with no blank covers. Turns out they were trial and error trying to find the voltage they needed to power heater zones on plastic extrusion. They couldn't figure out why some of the breaker positions were low voltage. It was a delta high leg xformer of course

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