Ampacities of copper wire, in free air at 30o C:
| INSULATION TYPE | |||
|---|---|---|---|
| RUW, T | THW, THWN | FEP, FEPB | |
| TW | RUH | THHN, XHHW | |
| Size | Current Rating | Current Rating | Current Rating |
| AWG | @ 60 degrees C | @ 75 degrees C | @90 degrees C |
| 20 | *9 | ----- | *12.5 |
| 18 | *13 | ----- | 18 |
| 16 | *18 | ----- | 24 |
| 14 | 25 | 30 | 35 |
| 12 | 30 | 35 | 40 |
| 10 | 40 | 50 | 55 |
| 8 | 60 | 70 | 80 |
| 6 | 80 | 95 | 105 |
| 4 | 105 | 125 | 140 |
| 2 | 140 | 170 | 190 |
| 1 | 165 | 195 | 220 |
| 1/10 | 195 | 230 | 260 |
| 2/0 | 225 | 265 | 300 |
| 3/0 | 260 | 310 | 350 |
| 4/0 | 300 | 360 | 405 |
* = estimated values; normally, wire gages this small are not manufactured with these insulation types.
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In Partnership with Microchip Technology
by Jake Hertz
by Aaron Carman
