Hangar Flying
Wire Size Calculator
Enter the circuit's voltages, its current and the length of the run, then press Calculate. The calculator names the smallest copper wire that passes both the voltage drop and the current checks, and the breaker or fuse to protect it. It is a design aid: verify the installation before you build it. Full instructions
Wire
Copper aircraft wire to MIL-W-22759/16, whose insulation is good for 150 °C. The temperature rise added to the temperature of the air around the wire should stay under that.
| AWG | Milliohms per foot | Amps, 35 °C rise | Amps, 10 °C rise |
|---|---|---|---|
| 22 | 16.1 | 5 | 3 |
| 20 | 10.2 | 7 | 4 |
| 18 | 6.39 | 10 | 5 |
| 16 | 4.01 | 12.5 | 7 |
| 14 | 2.53 | 15 | 10 |
| 12 | 1.59 | 20 | 12.5 |
| 10 | 1 | 30 | 15 |
| 8 | 0.628 | 40 | 20 |
| 6 | 0.395 | 54 | 30 |
| 4 | 0.249 | 72 | 40 |
| 2 | 0.156 | 100 | 54 |