Alternating Current Voltage Drop

600 Volt Systems

The table below was calculated using the equation where is voltage, is current, is conductor resistance, is conductor reactance and is the power factor. This formulation is useful where specific load detail are known.

Line-to-Line Voltage Drop for 3-phase, 600 VAC, 60 Hz, 75°C (167°F) conductors in conduit

The units of tabulated values for a given wire size and power factor are V/(1000 ft-A). For example, a 3-phase circuit with #2 conductors feeding a 0.90 pf load drawing 10 A will drop 3.55 V every 1000 feet of circuit length.
Wire Sizepf=1.0pf=0.95pf=0.90pf=0.80pf=0.70
145.3695.1404.8884.3713.849
123.4643.3283.1692.8422.509
102.0782.0091.9181.7281.533
81.3511.3191.2651.1481.026
60.8490.8410.8120.7450.673
40.5370.5430.5290.4920.450
30.4330.4430.4340.4080.376
20.3460.3600.3550.3360.313
10.2770.2940.2920.2810.264
1/00.2080.2270.2290.2230.214
2/00.1730.1940.1970.1950.188
3/00.1370.1580.1620.1640.160
4/00.1090.1310.1370.1400.139
2500.0940.1170.1230.1290.130
3000.0780.1020.1090.1150.118
3500.0680.0910.0990.1060.109
4000.0610.0840.0920.0990.103
5000.0500.0740.0810.0900.095
6000.0430.0670.0750.0850.090
7500.0360.0610.0690.0790.085
10000.0310.0540.0630.0730.079