Voltage Drop Formulas

Single Phase (2 or 3 wire)	VD =	2 x K x I x L CM	K = ohms per mil foot (Copper = 12.9 at 75°) (Alum = 21.2 at 75°) L = Length of conductor in feet I = Current in conductor (amperes) CM = Circular mil area of conductor
Single Phase (2 or 3 wire)	CM=	2K x L x I VD
Three Phase	VD=	1.73 x K x I x L CM
Three Phase	CM=	1.73 x K x L x I VD

Note: K value changes with temperature. See Code chapter 9, Table 8