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Selection of power cable size for different load current?
Tables of AWG wire sizesThe table below shows various data including both the resistance of the various wire gauges and the allowable current (ampacity) based on plastic insulation. The diameter information in the table applies to solid wires. Stranded wires are calculated by calculating the equivalent cross sectional copper area. Fusing Current (melting wire) is estimated based on 25°C ambient temperature. The table below assumes DC, or AC frequencies equal to or less than 60 Hz, and does not take skin effect into account. Turns of wire is an upper limit for wire with no insulation.AWGDiameterTurns of wireAreaCopper resistance[6]NEC copper wireampacitywith60/75/90 °Cinsulation (A)[7]Approximatestandard metricequivalentsFusing Current(copper)[8][9](inch)(mm)(per in)(per cm)(kcmil)(mm2)(Ω/km)(mΩ/m)(Ω/kFT)(mΩ/ft)Preece(~10s)Onderdonk(1s)Onderdonk(32ms)0000 (4/0)0.460011.6842.170.8562121070.16080.04901195 / 230 / 26031 kA173 kA000 (3/0)0.409610.4042.440.96116885.00.20280.06180165 / 200 / 22524.5 kA137 kA00 (2/0)0.36489.2662.741.0813367.40.25570.07793145 / 175 / 19519.5 kA109 kA0 (1/0)0.32498.2523.081.2110653.50.32240.09827125 / 150 / 1701.9 kA15.5 kA87 kA10.28937.3483.461.3683.742.40.40660.1239110 / 130 / 1501.6 kA12 kA68 kA20.25766.5443.881.5366.433.60.51270.156395 / 115 / 1301.3 kA9.7 kA54 kA30.22945.8274.361.7252.626.70.64650.197085 / 100 / 110196/0.41.1 kA7.7 kA43 kA40.20435.1894.891.9341.721.20.81520.248570 / 85 / 95946 A6.1 kA34 kA50.18194.6215.502.1633.116.81.0280.3133126/0.4795 A4.8 kA27 kA60.16204.1156.172.4326.313.31.2960.395155 / 65 / 75668 A3.8 kA21 kA70.14433.6656.932.7320.810.51.6340.498280/0.4561 A3 kA17 kA80.12853.2647.783.0616.58.372.0610.628240 / 50 / 55472 A2.4 kA13.5 kA90.11442.9068.743.4413.16.632.5990.792184/0.3396 A1.9 kA10.7 kA100.10192.5889.813.8610.45.263.2770.998930 / 35 / 40333 A1.5 kA8.5 kA110.09072.30511.04.348.234.174.1321.26056/0.3280 A1.2 kA6.7 kA120.08082.05312.44.876.533.315.2111.58825 / 25 / 30235 A955 A5.3 kA130.07201.82813.95.475.182.626.5712.00350/0.25198 A758 A4.2 kA140.06411.62815.66.144.112.088.2862.52520 / 20 / 25166 A601 A3.3 kA150.05711.45017.56.903.261.6510.453.18430/0.25140 A477 A2.7 kA160.05081.29119.77.752.581.3113.174.016- / - / 18117 A377 A2.1 kA170.04531.15022.18.702.051.0416.615.06432/0.299 A300 A1.7 kA180.04031.02424.89.771.620.82320.956.385- / - / 1424/0.283 A237 A1.3 kA190.03590.91227.911.01.290.65326.428.05170 A189 A1 kA200.03200.81231.312.31.020.51833.3110.1516/0.258.5 A149 A834 A210.02850.72335.113.80.8100.41042.0012.8013/0.249 A119 A662 A220.02530.64439.515.50.6420.32652.9616.147/0.2541 A94 A525 A230.02260.57344.317.40.5090.25866.7920.3635 A74 A416 A240.02010.51149.719.60.4040.20584.2225.671/0.5, 7/0.2, 30/0.129 A59 A330 A250.01790.45555.922.00.3200.162106.232.3724 A47 A262 A260.01590.40562.724.70.2540.129133.940.811/0.4, 7/0.1520 A37 A208 A270.01420.36170.427.70.2020.102168.951.47280.01260.32179.131.10.1600.0810212.964.907/0.12290.01130.28688.835.00.1270.0642268.581.84300.01000.25599.739.30.1010.0509338.6103.21/0.25, 7/0.1310.008930.22711244.10.07970.0404426.9130.1320.007950.20212649.50.06320.0320538.3164.11/0.2, 7/0.08330.007080.18014155.60.05010.0254678.8206.9340.006300.16015962.40.03980.0201856.0260.9350.005610.14317870.10.03150.01601079329.0360.005000.12720078.70.02500.01271361414.8370.004450.11322588.40.01980.01001716523.1380.003970.10125299.30.01570.007972164659.6390.003530.08972831110.01250.006322729831.8400.003140.07993181250.009890.0050134411049In the North American electrical industry, conductors larger than 4/0 AWG are generally identified by the area in thousands of circular mils (kcmil), where 1 kcmil = 0.5067 mm². The next wire size larger than 4/0 has a cross section of 250 kcmil. A circular mil is the area of a wire one mil in diameter. One million circular mils is the area of a circle with 1000 mil = 1 inch diameter. An older abbreviation for one thousand circular mils is MCM.
