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What size wire for 30 amps?
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10 AWG copper
minimum for 30 A (75 °C column, NEC 310.16) · 8 AWG aluminum · typical for electric dryers and water heaters
30 amp wire size by distance (3% voltage drop, copper)
| One-way distance | 120 V | 240 V |
|---|---|---|
| 25 ft | 10 AWG | 10 AWG |
| 50 ft | 8 AWG | 10 AWG |
| 75 ft | 8 AWG | 10 AWG |
| 100 ft | 6 AWG | 8 AWG |
| 125 ft | 4 AWG | 8 AWG |
| 150 ft | 4 AWG | 8 AWG |
| 200 ft | 3 AWG | 6 AWG |
| 250 ft | 2 AWG | 4 AWG |
| 300 ft | 2 AWG | 4 AWG |
Load assumed at the full 30 A. For continuous loads the circuit must be sized at 125% of the load (e.g. a 24 A continuous load on a 30 A breaker).
Check your exact run
FAQ
What size wire for a 30 amp circuit?
10 AWG copper or 8 AWG aluminum at 75 °C for short runs; longer runs need larger wire to limit voltage drop.
Can I use 10 AWG on a 30 amp breaker for 150 feet?
Check voltage drop: see the distance table on this page.
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