I was wondering about that myself. The 3 phases are 120 degrees out of phase, so it wouldn't be 300 amps on all of them at the same instant. Also, the sum of the currents in the 3 phases add up to zero. Like Phase 1 + phase 2 = -Phase 3. There's probably some sort of root mean square thing going on. Maybe it's 300*sqrt(3) haha. I have no idea what I'm talking about.
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