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Circular Mils from Voltage Drop

Circular Mils from Three Phase Voltage Drop, CM = (1.732 X K X I X L) / VD

Circular Mils from Single Phase Voltage Drop, CM = (2 X K X I X L) / VD

K = 12.9 for Copper, and K = 21.2 for Aluminum

Amperage, "I"
Length (Feet), "L"
Voltage, "E"
Max Percent VD, Max % VD

Check your minimum conductor size!