Electrical Conductor Size Calculator

This Calculator will determine the minimum size conductor needed based on a 3% Voltage Drop. It does not take into consideration other factors such as minimum ampacity based on the National Electrical Code Table 310-16. ( Allowable ampacities of conductors ). Consult The NEC for further details.

Please enter your values

120 Volts Copper Single Phase
208 Volts Aluminum Three Phase
240 Volts
277 Volts
480 Volts
Distance in feet, one-way
Total amperage of circuit
This is your minimum wire size.