Transformer High Leg color code

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robogeechee

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Is there a standard wire color to ascertain the "high leg" of a delta transformer - such as Orange conductor connected to the B-phase terminal?
 
Re: Transformer High Leg color code

The high or wild leg goes on the right side of the meter down here in Texas
 
Re: Transformer High Leg color code

Rob, be aware of what the "normal" way of marking the high leg is in your plant. It does not have to be orange or even colored, but it does have to be consistent (other effective means). :D
 
Re: Transformer High Leg color code

Thanks very much for all your answers...this confirms our shop's suspicion...but at least you directed me to the NEC articles, which I had a difficult time finding (if only I had looked under "Identification" in the index...apparently the only place using the phrase "high leg"). I appreciate the input of each of you!
 
Re: Transformer High Leg color code

I stand corrected. It's always right here to. Just a dump mental burb. I must have been standing in the building looking out when I typed that. :D
 
Re: Transformer High Leg color code

Originally posted by jtester:
Refer to NEC 215.8, 230.56, and 408.3(E)
Jim T
Click to expand...
And 110.15... Why is this mentioned four times?

And why is the utility standard to the right instead of center (B) like panels, etc?
 
Re: Transformer High Leg color code

Charlie will know on the meter, but I bet the reason why is thats how the meters are designed.
 
Re: Transformer High Leg color code

Tom is absolutely correct. High leg delta meters usually have one voltage coil rated higher than the others, 1 or 2 coils are rated for 120 v, line to neutral, and one is 208 volts, high leg to neutral.
Utility metering has been configured that way forever, but back in 1984 the NEC standardized on Phase B as the high leg even though metering didn't. I can't say why.
Jim T
 
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