Dishwashers are typically hardwired or cord-connected to a dedicated 20A, 120V circuit shared only with the garbage disposal.
| Recommended wire | 12/2 NM-B with ground |
| Breaker | 20A single-pole |
| Voltage | 120V |
| Typical amperage | 10A |
| Circuit amperage | 20A |
| NEC reference | NEC 422.16(B)(2), 210.52(B)(2) |
| Max recommended distance | About 90 feet one-way for 3% drop at 10A |
NEC allows the dishwasher and garbage disposal on the same 20A circuit since they don't typically run simultaneously.
12 AWG copper wire on a 20A, 120V single-pole circuit. Dishwashers are hardwired or plug-connected to a dedicated circuit. It may share a 20A general-purpose circuit with a garbage disposal if the combined load fits (NEC 210.23), but never a countertop small-appliance circuit (NEC 210.52(B)(2)).
Yes — NEC 2020 requires GFCI protection for dishwashers. The NEC 2020 code change added dishwashers to the list of appliances requiring GFCI protection due to their proximity to sinks and water. Use a GFCI breaker or GFCI outlet to protect the circuit.
Yes, if the combined nameplate load fits the 20A circuit (NEC 210.23) and both manufacturers allow it. The shared circuit must be a general-purpose circuit, not one of the kitchen countertop small-appliance circuits, which NEC 210.52(B)(2) reserves for receptacles. However, some jurisdictions require separate circuits for each appliance. Check with your local building department.
Most dishwashers can be either hardwired or connected via a 3-prong plug (NEMA 5-20P). Modern NEC allows cord-and-plug connection if the outlet is accessible (inside the cabinet under the sink). Older installations are typically hardwired using 12/2 NM-B cable.