To calculate wire ampacity for a circuit, use the Wire Ampacity Calculator or the Advanced Wire Ampacity Calculator.įor long conductor runs where voltage drop may be an issue, use the Voltage Drop Calculator to determine proper conductor sizing and maximumĬircuit length. To calculate wire size for a circuit, use the Wire Size Calculator or the Advanced Wire Size Calculator. This calculator is based on information found in this reference guide, and can help electricians troubleshoot maintenance and control circuits. Breaker size should generally be 125% of FLA of motor.Ī good field reference for maintenance and troubleshooting is Ugly's Electric Motor and Controls ( Ugly's Electric Motors And Controls, 2014 Edition ).
Note: Always refer to NEC when sizing conduit.
