Irrigation, Landscape Lighting, Tracer & Pet Fence

Wire Resistance & Properties (AWG & Metric)

AWG Stranding Diameter Cross Sect. Area Circular Mils D.C. Resistance (Ohms/1000 feet)
Copper Aluminum
in mm in² mm² @ 68°F (20°C) @ 167°F (75°C) @ 68°F (20°C) @ 167°F (75°C)
20 solid 0.032 0.81 0.001 0.52 1,020 10.150 11.953 - -
20 10 0.037 0.94 0.001 0.69 1,020 10.900 12.836 - -
19 solid 0.036 0.91 0.001 0.65 1,200 8.051 9.481 - -
18 solid 0.040 1.02 0.001 0.82 1,620 6.390 7.770 - -
18 7 0.046 1.17 0.002 1.07 1,620 6.538 7.950 - -
16 solid 0.051 1.29 0.002 1.31 2,580 4.021 4.890 - -
14 solid 0.064 1.63 0.003 2.08 4,110 2.525 3.070 - -
12 solid 0.081 2.06 0.005 3.32 6,530 1.587 1.930 - -
10 solid 0.102 2.59 0.008 5.27 10,380 0.995 1.210 - -
8 solid 0.128 3.25 0.013 8.30 16,510 0.628 0.764 - -
6 7 0.184 4.67 0.027 17.16 26,240 0.404 0.491 0.661 0.808
4 7 0.232 5.89 0.042 27.27 41,740 0.253 0.308 0.416 0.508
2 7 0.292 7.42 0.067 43.20 66,360 0.160 0.194 0.261 0.319
1 19 0.332 8.43 0.087 55.85 83,690 0.127 0.154 0.207 0.253
0 19 0.372 9.45 0.109 70.12 105,600 0.100 0.122 0.165 0.201
00 19 0.418 10.62 0.137 88.53 133,100 0.080 0.097 0.130 0.159
000 19 0.470 11.94 0.173 111.93 167,800 0.063 0.077 0.103 0.126
0000 19 0.528 13.41 0.219 141.26 211,600 0.050 0.061 0.082 0.100
250MCM 37 0.575 14.61 0.260 167.53 250,000 0.042 0.052 0.069 0.085
300MCM 37 0.630 16.00 0.312 201.11 300,000 0.035 0.043 0.058 0.071
350MCM 37 0.681 17.30 0.364 234.99 350,000 0.030 0.037 0.050 0.061
400MCM 37 0.728 18.49 0.416 268.55 400,000 0.026 0.032 0.043 0.053
500MCM 37 0.813 20.65 0.519 334.92 500,000 0.021 0.026 0.035 0.042
600MCM 61 0.893 22.68 0.626 404.07 600,000 0.018 0.021 0.029 0.035
700MCM 61 0.964 24.49 0.730 470.88 700,000 0.015 0.018 0.025 0.030
750MCM 61 0.998 25.35 0.782 504.68 750,000 0.014 0.017 0.023 0.028
800MCM 61 0.114 2.90 0.010 6.59 800,000 0.013 0.016 0.022 0.027
900MCM 61 1.094 27.79 0.940 606.45 900,000 0.012 0.014 0.019 0.024
1000MCM 61 1.152 29.26 1.042 672.45 1,000,000 0.011 0.013 0.017 0.021
Notes:
  • MCM means Thousands of Circular Mils
  • Stranding is the number of wire strands needed to make-up the whole conductor.
  • Source: 2008 National Electrical Code.