Built-in and over-the-range microwaves should have a dedicated 20A, 120V circuit. Countertop models can share a kitchen small-appliance circuit.
| Recommended wire | 12/2 NM-B with ground |
| Breaker | 20A single-pole |
| Voltage | 120V |
| Typical amperage | 12A |
| Circuit amperage | 20A |
| NEC reference | NEC 210.52 |
| Max recommended distance | 25 feet (without voltage drop concerns) |
Kitchen small-appliance circuits must be 20A per NEC 210.52(B). A dedicated circuit for the microwave is recommended but not always required.