What Size Breaker for Dishwasher?
A dishwasher requires a 15A breaker with 14 AWG wire on a 120V dedicated circuit.
🔌 Wire Length & Voltage Drop Check
Dishwasher Wiring Guide — NEC Requirements
Dishwashers require a dedicated 15A or 20A/120V circuit per NEC. Most modern dishwashers draw 10-12A. Many electricians install 20A circuits with 12 AWG wire for future flexibility.
Pro Tip
💡 The dishwasher circuit can share with a garbage disposal per NEC if using a 20A circuit with 12 AWG wire.
Why a 15A Breaker?
The dishwasher draws approximately 10A at 120V (1200W). A 15A breaker provides adequate protection.
Wire Sizing per NEC 310.16
For a 15A/120V circuit, 14 AWG copper is required per NEC Table 310.16 at 75°C. For runs over 75 feet, upsize to 12 AWG (recommended). Use our Wire Size Calculator and Voltage Drop Calculator.
Complete Parts List
To wire a dishwasher circuit: a 15A single-pole breaker, 14 AWG NM-B cable (Romex) for interior runs or THHN/THWN-2 in conduit for exposed runs, a NEMA 5-15 or 5-20 receptacle, cable clamps, and appropriate junction boxes.
Disclaimer: This guide is for reference only. All electrical work must be performed by or verified by a licensed electrician. Local codes may differ from NEC.