Amps
AWG Diameter(inch) kcmil Lbs/kft Ohms/kft Copper Alum
14 0.064 4.106 12.43 3.072 20
12 0.081 6.529 19.77 1.932 25 20
10 0.102 10.383 31.43 1.215 35 30
8 0.128 16.509 49.98 0.764 50 40
6 0.162 26.251 79.46 0.481 65 50
4 0.204 41.741 126.35 0.302 85 65
2 0.258 66.371 200.91 0.190 115 90
1 0.289 83.692 253.34 0.151 130 100
1/0 0.325 105.534 319.46 0.120 150 120
2/0 0.365 133.076 402.83 0.095 175 135
3/0 0.410 167.806 507.96 0.075 200 155
4/0 0.460 211.600 640.53 0.060 230 180
250 255 205
300 285 230
350 310 250
400 335 270
500 380 310
Amps are for conductors rated to 90C (194F).
Not more than three current carrying conductors per raceway/conduit/trench.
Assuming 30C (86F) ambient temperature.