Wire Size and Amp Ratings
The tables below are intended to be a general guide for wire size and amp ratings.
Ampacities of Insulated Conductors
|
Wire Size
|
60°C (140°F)
|
75°C (167°F)
|
||||
| AWG | (mm²) | Copper | Aluminum | Copper | Aluminum | |
| 14 | (2.1) | 15 | - | 15 | - | |
| 12 | (3.3) | 20 | 15 | 20 | 15 | |
| 10 | (5.3) | 30 | 25 | 30 | 25 | |
| 8 | (8.4) | 40 | 30 | 50 | 40 | |
| 6 | (13.3) | 55 | 40 | 65 | 50 | |
| 4 | (21.2) | 70 | 55 | 85 | 65 | |
| 3 | (26.7) | 85 | 65 | 100 | 75 | |
| 2 | (33.6) | 95 | 75 | 115 | 90 | |
| 1 | (42.4) | 110 | 85 | 130 | 100 | |
| 1/0 | (53.5) | - | - | 150 | 120 | |
| 2/0 | (67.4) | - | - | 175 | 135 | |
| 3/0 | (85.0) | - | - | 200 | 155 | |
| 4/0 | (107.2) | - | - | 230 | 180 | |
| 250 kcmil | (127) | - | - | 255 | 205 | |
| 300 | (152) | - | - | 285 | 230 | |
| 350 | (177) | - | - | 310 | 250 | |
| 400 | (203) | - | - | 355 | 270 | |
| 500 | (253) | - | - | 380 | 310 | |
| 600 | (304) | - | - | 420 | 340 | |
| 700 | (355) | - | - | 460 | 375 | |
