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DIY RPC - voltage on case & large imbalance between legs

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Good morning,
I purchased a mill with a DIY 10HP RPC a few years back that I haven’t used yet. I’d like to hook it to my 5HP lathe. I did see it in use when buying the mill.
I wired the unit to power and before I hooked the outputs up to any machine equipment, I wanted to check the legs against ground and against each other. one of the legs is producing 205 volts to ground, the other 2 are around 120 (I’m headed into shop to document it again, will update) this imbalance caught my eye. Leg...

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