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If you have to use metal clamps. What about using alumunum clamps instead then you don't have to worry about induction.

Thanks rbulsara, I have another question, is this really 3 phase?

When measuring line voltage at the secondary taps of a 3 phase open delta 4 wire(2 pot transformer configuration) wired for 120v/240v. Why wouldn't you read 480v instead of 240v when voltage is measured across the two outside taps? When measuring the voltage from the high leg to the grounded tap...