Conductor Sizing 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
208 Volts Aluminum 
240 Volts
277 Volts SinglePhase
480 Volts Three Phase
 - Distance in feet, one-way
 - Total amperage of circuit
   This is your minimum wire size