Restaurant Breaker Keeps Tripping: Causes and Fixes
When a restaurant breaker keeps tripping, a wire is in trouble. It’s carrying too much, leaking to ground, or sitting on a hot connection. That means an overload, a short, a ground fault, a worn-out breaker or a loose connection. Reset it once. Jot down what was running. Trips again? Call an electrician.
Don’t lose sleep over a single trip in a busy week. A breaker that drops at every lunch rush, every opening, every dishwasher start has a problem in the circuit, the equipment or a connection. And a trip costs real money. The walk-in goes dark, the fryer dies, the dishwasher quits with a rack inside. Don’t just flip the handle and hope. Go find the cause.
What a breaker trip actually means
Quick refresher on what a breaker is doing. Its job is to keep a circuit from carrying more current than the wire can take. Most commercial branch breakers are thermal-magnetic, which means two tripping mechanisms in one box. Heat building up over time trips the thermal side. That’s your overload. A sudden surge trips the magnetic side. That’s your short. GFCI and ground fault breakers add a third trigger by watching for current that escapes the circuit. So there are three usual causes:
- Overload. Too much equipment on one circuit. The breaker heats up and trips after a few minutes of heavy use.
- Short circuit. Current takes a path it was never meant to. You get a huge surge and the breaker goes almost instantly, often with a pop.
- Ground fault. Current leaks to ground, commonly through water, grease or damaged insulation. A GFCI device trips at a very small leak because it is built to protect people, not only wire.
Then there are two more. The breaker itself can be the problem, since they wear with age and repeated tripping, and a weak one can trip below its rating. And a loose connection doesn’t trip a breaker directly, but it makes heat that can. That one is among the more dangerous because it can scorch the panel.
Why kitchens trip more than other spaces
Heavy equipment, wet floors, daily abuse. A kitchen has all three, and the circuits feel it. Fryers, ovens, hood fans, dishwashers, reach-ins and prep gear all draw serious power, and motors draw extra just to get started (a walk-in compressor is the classic case). Grease and steam coat cords and receptacles. Washdowns put water near boxes and connections. Then a machine gets rolled out for cleaning and plugged back into the closest outlet, and now the load sits on a different circuit than anyone planned. Equipment in poor repair is also one of the most common violations LA County inspectors cite, as our restaurant violations data shows.
Restaurants that add equipment over time hit a different problem. A new warmer, a new ice machine or a second fryer gets added to a panel that was sized for the original kitchen. The panel did not change, but the load did. If your trips started after new equipment arrived, that is the first thing to look at, and our restaurant maintenance guide covers the preventive side.
Symptom guide
| What you see | Likely cause | Safe next step |
|---|---|---|
| Trips after several minutes of heavy use | Overload on a shared circuit | Note what was running together. Stagger the heavy equipment and ask an electrician about a separate circuit. |
| Trips instantly when you reset it | Short circuit, ground fault or failed breaker | Stop. Leave it off and call an electrician. |
| Trips only when one machine runs | That machine, its cord or its heating element | Unplug the machine, reset once, and have the machine serviced before using it again. |
| Trips during or after cleaning | Moisture in a receptacle, box or cord | Keep the circuit off until it is dry, then have the receptacle and wiring checked. |
| GFCI breaker or outlet trips repeatedly | Ground fault, damaged cord or wet equipment | Do not bypass the GFCI. Find the leaking device and repair it. |
| Breaker or panel feels hot, smells burnt or buzzes | Loose or failing connection | Turn off the equipment on that circuit and call right away. |
| Trips at random with no pattern | Aging breaker, loose connection or intermittent fault | Log the time and conditions, then book a diagnosis. |
The 80% rule for continuous loads
Electrical code treats any load that runs three hours or more as continuous, and caps a continuous load at 80% of the breaker’s rating. A lot of restaurant loads qualify, since refrigeration, hood fans, warmers and lighting all run for hours. That works out to about 16 amps continuous on a 20 amp breaker and about 24 on a 30 amp. Cross that line and you can get trips with no faulty machine anywhere. It also runs hot enough to age its wire and connections.
Motor loads follow separate sizing rules, and equipment nameplates list the minimum circuit size. If a machine’s nameplate asks for a 30 amp circuit and it is plugged into a 20 amp one, the breaker is working correctly and the wiring needs to change. Our commercial electrician service handles panel and circuit changes like that.
GFCI protection in commercial kitchens
The NEC calls for GFCI protection on receptacles in commercial kitchens, and California’s electrical code is built on it. Newer editions cover more receptacles and voltages, so check which edition your jurisdiction adopted. A GFCI trips when water or damaged insulation lets current leak, and a kitchen has plenty of both. So when one keeps tripping, it’s doing its job. Swap it for a regular breaker or outlet to shut it up and you’ve removed the protection, which can also be a code violation. We explain how these work in plain language in our outlet and GFCI safety guide.
Safe checks you can do first
Before you call, do a little legwork. You’ll be asked these things anyway, and none of the steps put your hands near live parts.
- Write down the time, what was running, and anything just cleaned or moved.
- Switch off or unplug everything on that circuit. Don’t touch the rest of the panel.
- Reset the breaker once. Off all the way, then on.
- If it holds, plug machines back in one at a time. Whichever one you plug in right before it trips again is your suspect.
- If it trips the second you reset it, with nothing connected, stop. That’s the wiring or the breaker talking.
When to stop and call right away
Call right away if there’s a burning smell, scorch marks on the panel or an outlet, heat at the breaker or receptacle, buzzing, crackling or sparks. Water in or near a panel is an emergency too. Any of that can mean a loose connection or arcing, and arcing is how kitchen fires get started.
What an electrician checks and fixes
On a repeat trip in a commercial kitchen we go down the list of symptoms above. Connections at the breaker and the receptacle first. Loose terminations are a common hidden cause, so we look for looseness and heat damage. Next, the cords and plugs on whatever was running, then the boxes and receptacles near wet areas, where we check for moisture and corrosion. Last, we compare the circuit’s load with the breaker size and the equipment nameplates, and we ask if the breaker itself has weakened with age.
Fixes go from small to big. A new breaker. A replaced receptacle or cord. Connections tightened and re-terminated. A heavy appliance moved onto its own circuit, or a dedicated circuit for new equipment, or a panel upgrade when the panel doesn’t fit the kitchen anymore. New circuits and panel changes usually need a permit and an inspection through the local building department, so ask about that before anyone starts. Our California electrical services guide and rewiring cost guide cover the bigger jobs, and the Long Beach commercial electrical guide covers the same work in that area.
Cost and downtime
For a restaurant, what a tripping breaker really costs you is service, so when we do the work matters as much as the price. Our commercial rate in the Los Angeles area runs $105 to $195 an hour, with a minimum charge of $110 to $210 and trip charges of $20 to $95. After-hours work is 1.25 to 1.6 times the standard rate, which lets the repair happen after you close. Urgent calls are 1.4 to 1.75 times. Take the low end: a $105 hour becomes roughly $131 to $168 after hours. For how quotes get built, see the commercial rates and quotes guide.
If you lease your space, who pays for panel and wiring work depends on the lease, and our guide to commercial lease repairs in California shows how to find the answer. And if you’re wondering what a failing exit light or emergency light costs to fix, the exit sign and emergency light testing guide is the next place to look.
FAQ
Why does my commercial breaker keep tripping?
Overload, short, ground fault, worn breaker, loose connection. Write down what was running when it tripped and how long after the reset it tripped again. Those two details narrow it down fast.
Is it safe to keep resetting a breaker that trips?
No. Switch off what’s on that circuit and reset once. If it drops again, stop and call an electrician. Reset it again and again and the wiring can cook and the breaker can die.
Why does a breaker trip immediately when I reset it?
That points to a short, a ground fault or a failed breaker. Leave it off and get it diagnosed, because the fault is there the moment power comes back.
Can a bad breaker cause tripping?
Yes. A worn breaker can trip under its rating or fail to carry a normal load. Don’t just swap it, though. Have an electrician test the breaker and the circuit together first. A weak breaker is sometimes just a symptom of a loose connection.
Can I put in a bigger breaker?
No. A breaker is there to protect the wire. Put in a bigger one and the wire can overheat. If you need more capacity on a circuit, add a new circuit sized for it.
Should I ignore a GFCI that keeps tripping?
No. It’s tripping because current is leaking, often through water or damaged insulation. Find that source and repair it. Don’t strip out the protection.
Get the panel looked at
Panel keeps tripping? Call 818-835-0556 and tell us what was running when it happened. Nothing speeds up a diagnosis more than that. You can also see our commercial electrician page and our commercial building repair services.
Related guides: Exit sign and emergency light testing · Commercial lease repairs: who pays · Commercial recessed lighting upgrade · Commercial and retail store maintenance