How size cable base on locked rotor amps?

Answer for USA, Canada and countries running a 60 Hz supply service.

The NEC has more than one table that can be used for this determination. The necessary parameters include the intended purpose of the motor, the name-plate current rating (that's not the locked rotor rating) and the duty rating of the motor. All this information should be listed on the name plate.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.