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I understand had it been a 3 phase 30kVA transformer I could calculate my current by 30kVA / 415 / route*3 = 42A.

If it was a single phase then simply 30kVA / 415 = 73A.

However if I am only using 2 phases from a 3 phase source yet still need to produce 30kVA of power, how do I calculate the line current?

Thanks in advance.