Motor Branch Circuit Sizing Calculator

Size motor branch circuit components per NEC Article 430: wire, breaker, overload, and starter.

Motor full-load amps from NEC tables.
A
Locked rotor current as multiple of FLA.
×FLA
Motor service factor (1.0 or 1.15).

Results

Min Wire Ampacity (125%)-A
Max CB Size (250%)-A
Overload Setting-A
Locked Rotor Amps-A
References: NEC Article 430 Part IV; NEC 430.52; NEC 430.32