What Size Breaker for a Dishwasher? 15 or 20 Amps, Wire Size & GFCI Rules (2026)
The breaker and wire your dishwasher needs, whether it can share with the garbage disposal, what the GFCI and AFCI rules say, and why yours keeps tripping.
That’s what the major brands ask for. Whirlpool’s installation instructions call for a 120-volt, 15- or 20-amp supply and recommend a separate circuit serving only the dishwasher. Bosch asks for a 15-amp breaker, or 20 amps if a food disposer shares the circuit.
The wire has to match: 14-gauge copper for 15 amps, 12-gauge copper for 20 amps. And newer codes want the circuit GFCI and AFCI protected.
Your dishwasher’s own installation guide is the final word, because the electrical code requires equipment to be installed the way its instructions say. Start with the chart below, then follow the steps to check your model.
Dishwasher Breaker Size Chart
Find your setup in the first column. Breaker and wire always go together: never put a bigger breaker on smaller wire.
| Setup | Breaker | Copper wire | Good to know |
|---|---|---|---|
| Built-in dishwasher on its own circuit | 15A or 20A | 14 AWG on 15A · 12 AWG on 20A | What most install guides ask for. Whirlpool and Bosch both call for a circuit serving the dishwasher. |
| Dishwasher + garbage disposal sharing a circuit | 20A | 12 AWG | Only if both installation guides allow it. Bosch permits 20 amps when a disposer shares. |
| Built-in with a plug (cord kit) | 15A or 20A | Matches the breaker | Cord 3 ft to 6 ft 6 in, grounding plug, outlet in the next cabinet (NEC 422.16(B)(2)). |
| Portable or countertop dishwasher | Kitchen outlet circuit (20A) | Already in the wall | Plugs into a countertop outlet. No new circuit, no extension cord. |
| Commercial or 240-volt dishwasher | From the nameplate | From the nameplate | A 5.5 kW unit draws about 23 amps at 240 volts. Follow the nameplate’s maximum breaker size. |
Wire sizes follow the NEC’s limits for copper conductors (14 AWG up to 15 amps, 12 AWG up to 20 amps). Local codes can be stricter.
Example: 1,200 W ÷ 120 V = 10 A
How to Find the Right Breaker for Your Dishwasher
Eight steps, from the sticker on your dishwasher to the breaker in your panel. The first three you can do without touching a wire.
- Find the model number. Look for the sticker on the edge of the tub or the door frame. You need it to pull up the right installation guide.
- Read the electrical section of the installation guide. It lists the voltage, the breaker size (usually 15 or 20 amps) and whether the dishwasher needs a circuit of its own. That guide is the rule to follow.
- Check the rating label. The label lists amps or watts. If it only gives watts, divide by 120 volts: a 1,200-watt rating works out to 10 amps.
- Turn the breaker off and confirm the power is off. Switch off the breaker, then check the dishwasher wiring with a non-contact voltage tester before touching anything.
- Check the breaker and the wire. The amp rating is printed on the breaker handle. The wire size is printed on the cable jacket (14/2 or 12/2), and NM cable is usually color-coded: white for 14-gauge, yellow for 12-gauge.
- Confirm GFCI and AFCI protection. Look for a TEST button on the breaker or on the outlet that feeds the dishwasher. Newer codes call for both protections on dishwasher circuits.
- Never upsize the breaker to stop trips. A bigger breaker on the same wire removes the protection the wire needs. Find the cause of the trip instead.
- Call a licensed electrician for new circuits. Running a new circuit or working in the panel usually needs a permit. An electrician will match the breaker to your panel and the wire.
- Turn the breaker off and confirm the power is off before you open the dishwasher’s wiring box.
- Burning smell, scorched wires or a warm breaker: leave the power off and call an electrician.
- Codes vary by state and city. Your local inspector has the final word.
GFCI and AFCI Rules for Dishwashers
Two kinds of protection now apply to most dishwasher circuits. They guard against different things.
- Protects people from shocks. Dishwashers mix water and power, so this matters.
- The NEC has required GFCI protection for outlets that supply dishwashers in homes since the 2014 edition.
- The 2023 NEC applies it whether the dishwasher plugs in or is hardwired, as Eaton’s summary of the change explains.
- Protects against fires from damaged or loose wiring.
- The 2014 NEC added kitchens and laundry areas to the AFCI list, according to IAEI Magazine.
- A dual-function breaker gives GFCI and AFCI protection in a single slot, like the Square D Homeline dual-function breaker.
- Breakers must match your panel’s brand and type, so check the label inside the panel door first.
States and cities adopt NEC editions on their own schedules, so the rules where you live may differ. Ask your local inspector whether replacing a dishwasher means upgrading the circuit.
Hardwired vs. Plug-In Dishwashers
Built-in dishwashers connect one of two ways. The breaker size is the same; what changes is how the power gets to the machine.
- The circuit cable runs straight into the junction box on the dishwasher.
- Most built-ins arrive ready for this. It’s permanent and tidy, but you need to turn the breaker off and disconnect wires to pull the dishwasher out.
- An approved cord kit, like the Whirlpool W11365014, replaces the hardwire connection.
- Under NEC 422.16(B)(2), the cord must be 3 ft to 6 ft 6 in long with a grounding-type plug, and the outlet goes in the space next to the dishwasher, usually the sink cabinet.
- Easier to unplug for repairs. The outlet still needs GFCI protection.
Portable dishwashers on wheels and countertop models come with a cord and use a normal kitchen outlet. See our picks for portable dishwashers on wheels and mini countertop dishwashers.
Can a Dishwasher and Garbage Disposal Share a Circuit?
Sometimes, on a 20-amp circuit, and only if both installation guides allow it. The combined running current has to fit the circuit, and the instructions decide.
- Allowed Bosch’s guide permits a 20-amp breaker when a food disposer shares the circuit. On 20 amps, the wire must be 12-gauge copper.
- Not recommended Whirlpool recommends a separate circuit serving only the dishwasher.
- Avoid Adding countertop outlets or other appliances to that circuit.
If the disposal and dishwasher trip the breaker when they run together, that’s your answer: give each its own circuit. Replacing the disposal too? See the best garbage disposals.
Why Your Dishwasher Keeps Tripping the Breaker
A breaker that trips is doing its job. Don’t keep resetting it, and never swap in a bigger breaker. Match the pattern instead.
| When it trips | Likely cause | What to do |
|---|---|---|
| Trips the moment the dishwasher starts | A short in the wiring, the door switch or the motor | Leave it off. Have the wiring and motor checked. |
| Trips during the heating or drying stage | A failing heating element, or water reaching the wiring box | Look for leaks under the tub. Call an appliance technician. |
| Trips only when the disposal runs too | Shared circuit overloaded | Run them one at a time, or add a separate circuit. |
| GFCI trips now and then | Moisture in the junction box or a leak | Dry and inspect the box; fix the leak first. |
| New breaker trips right away | Wrong breaker type for the panel, or a wiring mistake | Check the breaker matches the panel; call an electrician. |
To see what a plug-in dishwasher actually draws, plug it into a Kill A Watt meter. For hardwired models, an electrician can measure it with a clamp meter.
What About a 240-Volt or Commercial Dishwasher?
Home dishwashers in the U.S. run on 120 volts. Commercial machines and some high-output units run on 208 or 240 volts and need their own sizing.
A 5.5 kW unit usually lands on a 30-amp breaker, but the nameplate’s maximum breaker size is the number to follow.
For these, have an electrician size the breaker and wire from the nameplate.
How Much Does a Dishwasher Circuit Cost?
Those are HomeAdvisor’s 2026 figures. Distance from the panel, wall access and permits move the price. Installing a dishwasher where there was none, plumbing included, runs about $1,000 to $8,000 or more, according to HomeServe.
Shopping for the dishwasher itself?
Tools and Parts for a Dishwasher Install
Two parts for the hookup, three tools for safe testing, and one breaker for the panel.
For the hookup
Whirlpool W11365014 Dishwasher Power Cord Kit
Turns a hardwire-ready dishwasher into a plug-in one, where your local code allows it. The kit has the cord, a grommet, a metal strain relief and instructions, and the right-angle plug suits a tight sink cabinet. Whirlpool says it fits several major brands, but check your dishwasher’s manual for its approved cord kit first.
Check Whirlpool Cord Kit Price on Amazon →
Eastman 41041 Dishwasher Installation Kit (5 ft Braided Supply Line)
Putting in a new dishwasher means a water hookup too. This kit has a 5-foot braided supply line with 3/8-inch compression ends, a 3/8-inch MIP 90° elbow and a 3/4-inch FHT 90° elbow, so it connects in tight spaces without soldering.
It’s rated for drinking water, 200 PSI and 15 to 158°F, and it’s UPC approved and CSA certified. Lengths from 4 to 12 feet are on the same listing.
Check Eastman Kit Price on Amazon →For safe testing
Fluke 1AC II VoltAlert Non-Contact Voltage Tester
Before anyone touches the wires in the dishwasher’s junction box, check they’re dead. Hold the tip near a wire or outlet and it glows red and beeps if it finds voltage. It runs a continuous self-test so you know it’s working, and it has a silent mode.
Test it on an outlet you know is live first, then on the dishwasher wiring.
Check Fluke 1AC II Price on Amazon →
P3 P4400 Kill A Watt Electricity Usage Monitor
Plug a portable, countertop or cord-connected dishwasher into it to see what it really draws, from amps to kilowatt-hours over a full cycle.
It can also total the running cost by day, week, month or year, which is handy if you’re weighing up dishwasher vs. hand-washing costs. It only works with plug-in appliances, not hardwired ones.
Check Kill A Watt Price on Amazon →
Klein Tools CL900 Digital Clamp Meter (2000A AC/DC, TRMS)
Measures the current a hardwired dishwasher actually pulls without disconnecting anything: clamp it around one hot wire, not the whole cable.
Inrush mode catches the start-up surge of the motor, and low-impedance (LoZ) mode filters out “ghost” voltage. It also reads voltage, resistance, continuity and capacitance, with a backlit screen and 6.6-foot drop protection. It’s a pro tool; for plug-in models the Kill A Watt is simpler.
Check Klein CL900 Price on Amazon →For the panel
Square D Homeline HOM120PDFC 20A Dual Function (CAFCI + GFCI) Breaker, 4-Pack
One 20-amp breaker that covers both kitchen rules, arc-fault (AFCI) and ground-fault (GFCI) protection, so a dishwasher circuit needs just one slot.
The plug-on neutral design means no pigtail wire. It only fits Square D Homeline plug-on neutral load centers (series 4 and newer, per the listing), not other brands or older Homeline panels, so check the label inside your panel door. Installing it is a job for a licensed electrician in most areas.
Check Square D Breaker Price on Amazon →Ratings and review counts are as listed on Amazon at the time of writing. Price tiers: $ under $15 · $$ $15–50 · $$$ over $50.
Dishwasher Breaker FAQs
Does a dishwasher need a 15 or 20 amp breaker?▼
Either, depending on the model and the wire. Whirlpool’s instructions call for a 120-volt, 15- or 20-amp supply. Bosch asks for 15 amps, or 20 amps if a food disposer shares the circuit. Use 14-gauge copper wire on 15 amps and 12-gauge on 20 amps.
Can a dishwasher be on a 15-amp circuit?▼
Yes, if its installation guide allows it. Many do. The wire must be at least 14-gauge copper, and nothing else heavy should share the circuit.
Does a dishwasher need a dedicated circuit?▼
Most manufacturers ask for one. Whirlpool recommends a separate circuit serving only the dishwasher, and Bosch calls for a dishwasher-dedicated circuit. The NEC (110.3(B)) requires equipment to be installed according to its instructions, so the manual decides.
Does a dishwasher need GFCI protection?▼
Yes, under the NEC since the 2014 edition. The 2023 NEC makes clear it applies whether the dishwasher plugs in or is hardwired. Your area’s adopted code edition decides what applies to you.
Does a dishwasher need AFCI protection?▼
Usually, yes. The 2014 NEC added kitchens to the areas that need arc-fault protection. A dual-function breaker covers AFCI and GFCI in one.
Can a dishwasher and garbage disposal be on the same circuit?▼
Sometimes, on a 20-amp circuit, if both installation guides allow it. Bosch permits a 20-amp breaker when a disposer shares the circuit. Whirlpool recommends a circuit serving only the dishwasher. When in doubt, give each its own circuit.
What size wire do I need for a dishwasher?▼
14-gauge copper on a 15-amp breaker, 12-gauge copper on a 20-amp breaker. 14-gauge wire should never be on a 20-amp breaker.
Can I plug a dishwasher into a regular outlet?▼
A built-in can plug in with an approved cord kit. Under NEC 422.16(B)(2), the cord must be 3 ft to 6 ft 6 in long with a grounding plug, and the outlet goes in the space next to the dishwasher, usually the sink cabinet. Portable and countertop models plug into a standard kitchen outlet.
How many amps does a dishwasher use?▼
Check the rating label or your manual. If it lists watts, divide by 120 to get amps. Our guide to how many amps a dishwasher uses covers typical numbers.
What size breaker do I need for a 5.5 kW dishwasher?▼
Usually a 30-amp breaker on a 240-volt circuit, but the nameplate decides. 5,500 watts ÷ 240 volts is about 23 amps. Commercial units list a maximum breaker size on the nameplate. Have an electrician size the circuit and wire.
Why does my dishwasher keep tripping the breaker?▼
Common causes are a shared, overloaded circuit, moisture in the wiring box, a failing heating element or a motor fault. Don’t keep resetting it. See the tripping chart above, and call a technician if it trips again.
Can I put a 20-amp breaker on 14-gauge wire?▼
No. 14-gauge copper is limited to 15 amps. A 20-amp breaker would let the wire overheat before it trips.
How much does it cost to add a circuit for a dishwasher?▼
About $570 to $1,000, roughly $700 on average, according to HomeAdvisor’s 2026 cost guide. If the panel is full, a panel upgrade adds about $500 to $2,000.
Can I wire a dishwasher circuit myself?▼
It depends on where you live. Many areas require a permit, and some require a licensed electrician for any new circuit. Panel work carries a real shock risk, so most homeowners hire a pro.
What size breaker does a portable or countertop dishwasher need?▼
No special breaker: it plugs into a kitchen countertop outlet, which the NEC puts on 20-amp circuits. Skip extension cords. See our mini countertop dishwasher picks.
The Bottom Line
- Breaker: 15 or 20 amps on 120 volts, as your installation guide says.
- Wire: 14-gauge copper on 15 amps, 12-gauge on 20 amps. Never upsize the breaker.
- Protection: GFCI, and AFCI in most kitchens. A dual-function breaker does both, if it matches your panel.
- Disposal on the same circuit: only on 20 amps and only if both guides allow it.
- Plug-in: use an approved cord kit and an outlet in the next cabinet.
- Before touching wires: breaker off, then check with a voltage tester.
New circuit or panel work? Call a licensed electrician. It’s safer, and most areas require a permit.
![How Many Ounces Are in a Blender Bottle? Size Guide + Best Picks [2026]](https://kitchenguide101.com/wp-content/uploads/2022/10/20250520_1212_Blender-Bottle-on-Countertop_simple_compose_01jvp8jyfgfmcbpyk1145d24vw-300x300.png)
