Motor Locked-Rotor Current Calculator
Starting amps from HP and code letter per 430.7(B) with FLA multiple. 3 inputs, 2 outputs.
Result
Locked-rotor current
Waiting for calculation.
Multiple of FLA
Waiting for calculation.
Formula
Calculation logicRelated calculators
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125% conductors with locked-rotor-rated OCPD per NEC 695. 3 inputs, 3 outputs.
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Gauge-picked conductor at 125% FLA, ground reference, conduit fill hint and voltage at motor. 6 inputs, 4 outputs with grouped results.
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Disconnect at 115% FLA per 430.110(A) to a standard switch size. 2 inputs, 3 outputs.
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Motor Full-Load Current Calculator
Estimate FLA from HP, efficiency and PF, cross-checked against the NEC Table 430.250 dataset. 4 inputs, 5 outputs with grouped results.
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