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Oops... Double post.

I'll bet they tied into something called a high-leg Delta service. I've encountered that a number of times in older converted industrial buildings that used a lot of 3-phase motors. Also called a Red-Leg or Wild-Leg service, two of the three phases will measure 120-volts to neutral, but the...

Thanks for posting my No~Shock~Zone info on this forum. Here's a link to the full article I wrote about RPBGs (Reverse Polarity Bootleg Grounds) for electricians http://ecmweb.com/contractor/failures-outlet-testing-exposed and here's a link specifically about RPBG failures as they relate to...