Easy Voltage Drop

Three Phase Voltage Drop, "VD" = (1.732 x K x I x L) / CM

Single Phase Voltage Drop, "VD" = (2 x K x I x L) / CM

Percent Voltage Drop, "%VD" = (VD / E) x 100

K = 12.9 for Copper, and K = 21.2 for Aluminum, when using Feet

OR

K = 42.3 for Copper, and K = 69.5 for Aluminium, when using Meters

Voltage Drop Calculations:

Feet Meters

Amperage, "I"
Length in Feet, "L"
2000 kcmil 1750 kcmil 1500 kcmil 1250 kcmil 1000 kcmil 900 kcmil 800 kcmil 750 kcmil 700 kcmil 600 kcmil 500 kcmil 400 kcmil 350 kcmil 300 kcmil 250 kcmil 4/O, 211600 CM 3/O, 167800 CM 2/O, 133100 CM 1/O, 105600 CM 1 AWG, 83690 CM 2 AWG, 66360 CM 3 AWG, 52620 CM 4 AWG, 41740 CM 6 AWG, 26240 CM 8 AWG, 16510 CM 10 AWG, 10380 CM 12 AWG, 6530 CM 14 AWG, 4110 CM 16 AWG, 2580 CM 18 AWG, 1620 CM Choose Wire Size

Percent Voltage Drop Calculations:

Voltage, "E"

Note: The constants are based on the ohms/km and ohms/kFT for 1000 kcmil wire in NEC Chapter 9, Table 8.