Garbage Disposal Breaker & Wire Size
Free online tool • 2026 NEC Compliant
Most residential garbage disposals run on a dedicated 120V circuit protected by a 15 amp or 20 amp breaker. Standard 1/3 to 1/2 horsepower disposals are typically fine on a 15A circuit with 14 AWG wire, while larger 3/4 to 1 horsepower models are better suited to a 20A circuit with 12 AWG wire. A dedicated circuit — not shared with other kitchen loads — is recommended by most manufacturers.
Recommended Sizing
NEC Standard SizeBreaker Type: Standard Inverse-Time
NEC Reference Note: 125% multiplier applied for continuous loads per NEC 210.20(A).
How to Use This Calculator
Check disposal horsepower/nameplate
Find the HP rating and amp draw on the disposal's motor nameplate.
Match to standard circuit size
1/3–1/2 HP typically uses 15A; 3/4–1 HP typically uses 20A.
Select wire size
15A circuit = 14 AWG copper; 20A circuit = 12 AWG copper.
Verify dedicated circuit
Confirm the disposal is on its own dedicated branch circuit, not shared with unrelated loads.
Frequently Asked Questions
What size breaker does a garbage disposal need?
Most residential garbage disposals require a dedicated 15A or 20A 120V circuit. Standard 1/3–1/2 HP units run fine on 15A with 14 AWG wire; larger 3/4–1 HP models are better matched to a 20A circuit with 12 AWG wire. Check the nameplate amp draw to confirm.
Can a garbage disposal share a circuit with a dishwasher?
It depends on local code and the amperage of both appliances. Many installations use a dedicated 20A circuit split between a disposal and dishwasher when both are lightly loaded, but a fully dedicated circuit for each appliance is the more conservative and commonly recommended approach. Check your local amendments.
Does a garbage disposal circuit need GFCI protection?
Requirements vary by NEC edition and local amendment. The 2020 NEC explicitly requires GFCI protection for dishwasher branch circuits (210.8(D)); garbage disposal requirements differ by jurisdiction, so verify with your local electrical inspector.
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