For 3 phase power we know that P = 3*I*V (where I and V are phase values). Since this is 3 phase power we have a multiplier of 3. If you have 2 phases, I would imagine it would be P = 2*I*V (where I and V are phase values).
208 = line-to-line voltage
120 = phase voltage
So I would imagine your current would equal I = P/2*V
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