Rule of Thumb
| Amperage | Size (AWG) |
|---|---|
| 15 | 14 |
| 20 | 12 |
| 30 | 10 |
| 40 | 8 |
| 55 | 6 |
“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”