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I have a 3phase 4 wire 120/208 panel fed from a transformer that is fed from a 277/408 panel. We turned it on and while testing voltage at a receptacle, it read 60v. I won't be back to trouble shoot til Tuesday but I can't stop thinking about it. Two explanations that I could think of is a loose neutral, or insufficient bonding of the neutral to ground from the xfmr. What are your opinions on these theories?
 

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Data Tech/Apprentice.
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One of your phases has completely dropped out perhaps?
 
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