Central AC units typically draw 15-25 amps depending on size (2-5 ton). A 3-ton unit typically draws about 18-20 amps.
| Recommended wire | 10/2 with ground |
| Breaker | 30A double-pole |
| Voltage | 240V |
| Typical amperage | 20A |
| Circuit amperage | 30A |
| NEC reference | NEC 440 |
| Max recommended distance | 50 feet (without voltage drop concerns) |
AC units have high starting (LRA) currents that can be 3-5× running amps. The breaker and wire must handle the maximum circuit ampacity marked on the unit's nameplate. Check the MCA (Minimum Circuit Ampacity) and MOP (Maximum Overcurrent Protection) on the data plate.