In article , Gary Coffman says...

Because the motor won't actually try to spin up when fed only 1 ph, the starting
surge isn't all that much over normal running current, impedance limited. So the
breaker probably won't trip.

Have to disagree on that one. My 5 hp motor will absolutely
trip the 15 amp fuses if I try to start it without spinning it
up first.

The impedance a motor winding with a stationary rotor is
pretty low actually.

Jim

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