![]() Visit the Terms of Use and Privacy Policy for this site. Visit the Tables page to view reference tables such as Maximum Ampacity for Current-Carrying Conductors. 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. Insert these 3 quantities in the calculator, and you should get the same result. To calculate wire size for a circuit, use the Wire Size Calculator or the Advanced Wire Size Calculator. You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. 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. ![]()
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