I am a little confused as to how to correclty size a circuit breaker for protecting a motor. I am refering more specifically to continuous duty motors on a branch circuit from an MCC or or other type of bus. In sizing an overcurrent protective device or circuit breaker I'm not sure weather to follow NEC section 430.32 stating to select a device at 125% of motor FLA, or to follow table 430.52 which gives percentages (from 300 to 800 percent of FLA) for selecting a circuit breaker. Which of these rules to follow, or do I follow them both? How should I correctly go about sizing a circuit breaker on a motor branch?
I would appreciate any information on this subject.