Start here, because it changes what you do next: a breaker that trips is a breaker that is working.
It is a deliberately weak link. It is meant to give way before the wiring behind the wall gets hot enough to matter. The trip is the safety system reporting a problem, not the problem itself.
Which means the useful question is never how to make it stop tripping. It is what the circuit is telling you.
The three ordinary causes
Nearly every repeat trip is one of three things, and you can usually tell them apart from the pattern.
| Cause | What it looks like | How fast it trips |
|---|---|---|
| Overload | Trips only when two or three things run together | After a delay, sometimes minutes |
| Short circuit | Trips the instant something is plugged in or switched on | Instantly, often with a bang |
| Ground fault | Trips in wet weather, outdoors, or at a bathroom or kitchen receptacle | Instantly, no noise |
Overload is the common one and the least alarming
A circuit rated 15 amps carries 15 amps. Put a kettle, a toaster and a space heater on it and the breaker does exactly what it was installed to do.
This is a load problem, not a fault. The answer is either fewer things on that circuit or another circuit, and which one depends on what the rest of the house is already drawing. That is a load calculation, not a look at the panel door.
Why does the breaker trip when the dryer and the kettle run together?
Because they are on the same circuit, or because the service itself has no headroom left. Those are different problems with very different prices. A shared circuit is a wiring job. A service with nothing spare is a panel and service question, and the honest answer is sometimes that a subpanel solves it for a quarter of the cost.
Short circuits announce themselves
A hot conductor touching a neutral or a ground draws enormous current instantly, and the breaker cuts it in a fraction of a second. Usually there is a bang, sometimes a flash, and the cause is almost always local: a damaged cord, a failed appliance, a nail through a cable, a receptacle that somebody wired in a hurry.
Unplug everything on the circuit and reset it once. If it holds, the fault is in something you unplugged. If it does not, the fault is in the fixed wiring.
Ground faults follow the weather
Current escaping the circuit — through moisture, through a damaged cable, through a person — is what ground-fault protection exists to catch, and it operates at a tiny fraction of the current an ordinary breaker needs.
That is why these trips cluster outdoors, at exterior receptacles, in bathrooms and kitchens, and along the shoreline. It is also why they are seasonal.
The regional pattern
Two things about this region put a distinctive shape on the problem.
Spring, at the water. Ice movement over the winter works on everything attached to a dock or a boathouse, and the feeder is the least flexible thing on it. The first warm weekend of the season is when the ground fault shows up, and the rules that govern that wiring are a separate section of the code from the house. A cottage that sat empty since October produces a run of these every May.
Winter, in the town cores. The pre-war stock in Orillia, Midland and Collingwood frequently still sits on a 60 A service with a fuse panel, and a cold snap is what finds the limit. Nothing is faulty. There is simply nothing spare, and there has not been for thirty years.
Older wiring changes the reading
On knob and tube or aluminium branch wiring, a repeat trip deserves more weight than it does on modern cable. Aluminium fails at the terminations rather than in the middle of a run, and a connection that has been slowly loosening is generating heat at a point rather than current through a circuit.
Which brings up the part of this page that matters most.
The fault that never trips a breaker
A breaker responds to current. A bad connection produces heat.
A terminal that has worked loose over years, or corroded, or been tightened onto aluminium with the wrong connector, concentrates heat right at that point while the circuit continues to draw a perfectly ordinary current. No breaker anywhere in the panel has any reason to operate.
That is how most electrical fires in older houses start, and it explains why “nothing has ever tripped” is not the reassurance people take it for.
The warning signs are physical rather than electrical:
- A receptacle, switch plate or breaker that is warm to the touch
- Brown or yellow discolouration on a device or a panel bus
- Any smell of hot plastic, however faint, however briefly
- Lights that dim noticeably whenever a large appliance starts
Any of those is a call today rather than a job to book. The written assessment is the cheap part.
What we will tell you not to spend money on
Do not replace a breaker to stop it tripping. A larger breaker on the same conductor removes the protection and leaves the wire. That is the single most dangerous thing a person can do to their own panel, and it is common enough that we look for it on every older installation.
Do not book a service upgrade off one winter of tripping. Prove the overload first. Two circuits added where the load actually sits will sometimes do the whole job.
And do not chase a ground fault indoors in April before somebody has looked at what the ice did outside.
Related reading: what to do about a Commander electrical panel whose breakers never trip, and what a panel upgrade costs around Georgian Bay.