The high leg

A case of PEBKAC (Problem Exists Between Keyboard and Chair)? Tell us about your war stories!
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Sam Buca
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Location: Dallas, TX

The high leg

Post by Sam Buca » Sat Aug 27, 2011 10:33 pm

We have 4 wire delta. Electrician said the rotation was correct. IT protector went boom. UPS threw the breaker and does a nice arc flash/pop when you try to turn on its internal breaker.

Moral of the story: have your electrician pay attention to where the high leg is. Trust not the colored electrical tape on the wires, but rather trust in your $5 DMM.

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Re: The high leg

Post by Shane » Sat Aug 27, 2011 11:39 pm

Well, I sorta like the way the soot blew out the little hole in the corner of the j-box and decorated the wall behind.
Mike Shane, CBRE

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Joined: Mon Dec 21, 2009 11:47 am

Re: The high leg

Post by n9lhm » Wed Sep 21, 2011 2:26 pm

I absolutely HATE high leg delta three-phase service. It is an accident looking for a place to happen. It should have never been allowed, IMHO. Brian

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