Wire Size Calculator
Select Voltage
120V 208V 240V 277V 480V
Select Wire Type
  Copper Aluminum
Select Phase
  Single Phase Three Phase
Input Amperage Input One Way Distance (in feet)
Minimum Size Required
Voltage Drop Calculator Voltage Drop Table
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.

Gorham/Schaffler Inc. takes no responibility for any false or Misleading information. The use of these tables and/or calculators are the responsibility of the user only. The results produced by using these tables and/or calculators are not guaranteed to be correct or applicable in all situations.

The user must also understand the National Electrical Code may or may not be legally acceptable in their area and may be modified or superceded by the locality in which the work is done.