ECN Forum Forums Code Related Discussion NEC & other Code issues Breaker size for 30 hp motor

It looks like your caculations are correct.
The 100 amp is the max size breaker you can use. You may not go up the the next size.
You may go to an 80 amp breaker if it will
allow the motor to start.
i don't know why Uglys would list a 70 amp.
That seems to be too small.