Question: Are you measuring Line To Ground voltage between one Ungrounded Conductor and the Grounded Conductor, or to the Grounded Equipment [EGC]?
This doesn't change anything, I am just curious to the L-G voltage readings.
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Thanks Scott, and yes I did measure from both Line to neutral and L-G and all 3 were still 120v, pretty strange ??
I have to wire in a 40a single phase compressor a hope it works ok on phase A&B or B&C, until I can find out the problem.
I'll let you know what I find.
Thanks again,
