Motor HP table for sizing of upstream Circuit Breakers and Safety Switches
Motor HP rating tables for sizing of upstream Circuit Breakers and Safety Switches, based on 2005 NEC Tables 430-147, 430-148, 430-150
Circuit Breakers (inverse-time thermal-magnetic and electronic) and Safety Switches
Applies to selection of inverse-time circuit breakers and safety switches
Does not apply to the selection of motor circuit protectors or overload relay thermal units.
Assistance is needed for selecting a circuit breaker or safety switch to feed a motor
If a circuit breaker or safety switch is to be used to protect a motor, the attached table has information to help you select the proper size. This is from Digest 176, page 7-33, dated 2012.
(These tables do not apply when selecting a motor circuit protector or overload relay thermal unit.)