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Motor Circuit Calculator
NEC 430 motor FLA, minimum wire size, branch circuit protection, and overload sizing
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Motor Parameters
NEC 430 Motor Circuit Sizing
Full Load Amps (NEC Table 430.250)
7.6A
Min Wire Size
125% FLA = 9.5A
12 AWG Cu
Branch Circuit OCPD
Inverse-time breaker (250%)
20A
Overload Protection
125% FLA = 9.5A
≤ 9.5A
NEC 430 Reference
430.22(A)Branch circuit conductors ≥ 125% of motor FLA
430.52(C)(1)Inverse-time breaker rating ≤ 250% of FLA (next standard size up, max 400%)
430.32(A)(1)Overload device ≤ 125% FLA (SF ≥ 1.15 motor); ≤ 115% if SF < 1.15 or unlisted
430.6(A)Use NEC Table 430.247–250 FLA values, not nameplate, for circuit sizing
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