What Size Wire Do You Need? 15-200 Amps
NEC code-minimum copper and aluminum conductor sizes for every common breaker and service rating (75°C terminations, Table 310.16 — with the 310.12 dwelling-service rule where it applies). Pick an amperage for aluminum options, voltage-drop distances, and what typically runs on it.
| Breaker / service | Copper (75°C) | Aluminum (75°C) | Typical use |
|---|---|---|---|
| 15 A | 14 AWG | — | Lighting circuits |
| 20 A | 12 AWG | — | Kitchen small-appliance circuits |
| 25 A | 10 AWG | — | Small mini-split condensers |
| 30 A | 10 AWG | 8 AWG | Electric dryer |
| 35 A | 8 AWG | 8 AWG | Heat pump condensers |
| 40 A | 8 AWG | 8 AWG | Electric range |
| 45 A | 8 AWG | 6 AWG | Heat pump with strip heat |
| 50 A | 8 AWG | 6 AWG | Range/cooktop |
| 60 A | 6 AWG | 4 AWG | 48 A EV charger (hardwired) |
| 70 A | 4 AWG | 3 AWG | Subpanel feeder |
| 80 A | 4 AWG | 2 AWG | Subpanel feeder |
| 90 A | 3 AWG | 2 AWG | Subpanel feeder |
| 100 A service | 4 AWG | 2 AWG | Main service (older/smaller homes) |
| 125 A service | 2 AWG | 1/0 AWG | Main service |
| 150 A service | 1 AWG | 2/0 AWG | Main service |
| 200 A service | 2/0 AWG | 4/0 AWG | Standard main service for modern homes |
Service rows show the NEC 310.12 dwelling-service size; open a rating for the general feeder size from Table 310.16. Guidance only — confirm with a licensed electrician and your local code.