Estimate Voltage Drop
This table was calculated using the equation $latex V=I(R cos(\phi) + X sin(\phi))$ where $latex V$ is voltage, $latex I$ is current, $latex R$ is conductor resistance, $latex X$ is conductor reactance and $latex \phi$ is the power factor. This formulation is useful where specific load detail are known. Calculate the exact voltage drop here: AC Voltage Drop Calculator.
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 Size | pf=1.0 | pf=0.95 | pf=0.90 | pf=0.80 | pf=0.70 |
---|---|---|---|---|---|
14 | 5.369 | 5.140 | 4.888 | 4.371 | 3.849 |
12 | 3.464 | 3.328 | 3.169 | 2.842 | 2.509 |
10 | 2.078 | 2.009 | 1.918 | 1.728 | 1.533 |
8 | 1.351 | 1.319 | 1.265 | 1.148 | 1.026 |
6 | 0.849 | 0.841 | 0.812 | 0.745 | 0.673 |
4 | 0.537 | 0.543 | 0.529 | 0.492 | 0.450 |
3 | 0.433 | 0.443 | 0.434 | 0.408 | 0.376 |
2 | 0.346 | 0.360 | 0.355 | 0.336 | 0.313 |
1 | 0.277 | 0.294 | 0.292 | 0.281 | 0.264 |
1/0 | 0.208 | 0.227 | 0.229 | 0.223 | 0.214 |
2/0 | 0.173 | 0.194 | 0.197 | 0.195 | 0.188 |
3/0 | 0.137 | 0.158 | 0.162 | 0.164 | 0.160 |
4/0 | 0.109 | 0.131 | 0.137 | 0.140 | 0.139 |
250 | 0.094 | 0.117 | 0.123 | 0.129 | 0.130 |
300 | 0.078 | 0.102 | 0.109 | 0.115 | 0.118 |
350 | 0.068 | 0.091 | 0.099 | 0.106 | 0.109 |
400 | 0.061 | 0.084 | 0.092 | 0.099 | 0.103 |
500 | 0.050 | 0.074 | 0.081 | 0.090 | 0.095 |
600 | 0.043 | 0.067 | 0.075 | 0.085 | 0.090 |
750 | 0.036 | 0.061 | 0.069 | 0.079 | 0.085 |
1000 | 0.031 | 0.054 | 0.063 | 0.073 | 0.079 |
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