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This calculator will give you a very close calculation based upon your input on what your voltage drop is, the voltage at the end of the load, and much more. But keep in mind that there are other factors that there may be on the job site that can effect these calculations. So it is important that you concult with a certified electrician for actual calculations.

Go to Voltage Drop Calculator

This calculator will determine the minimum size conductor needed based upon a 3% voltage drop. It does not take into consideration other factors such as minimum ampacity based upon the National Electrical Code table 310-16. (Allowable ampacity of Conductors) Consult Electrical code for further details.

Go to Wire Size Calculator