FIG. 00 — IN PROGRESS
MOTOR CIRCUIT CALCULATOR
Size motor branch-circuit conductors and protection per NEC Article 430. Inputs: HP, voltage, phase, motor type. Outputs: minimum conductor ampacity, branch-circuit short-circuit protection size, overload protection rating.
⚠ STATUS · TOOL UNDER FINAL VALIDATION
We're finalizing this calculator's NEC validation. In the meantime, use the conduit fill calculator and the wire fill chart on the homepage.
FIG. 01
WHAT THIS TOOL WILL CALCULATE
- 01Input: motor HP, voltage (115V / 208V / 230V / 460V), phase (1Φ / 3Φ), motor type (induction / synchronous)
- 02Output: NEC 430.6 full-load amps from Table 430.248–430.250, NEC 430.22 conductor sizing (125% of FLA), NEC 430.52 short-circuit protection size
- 03Includes overload protection sizing per NEC 430.32 (typically 115%–125% of FLA)
- 04Multi-motor circuit handling per NEC 430.24 (largest motor + 100% of others)