Why Does Your Big Bear Cabin's Breaker Keep Tripping Every Winter?

If you've reset the same breaker three times this week, you're not imagining it — cold weather really does trip breakers more than warm weather does. That's not because your electrical system is failing. It's usually because you're asking more of it than usual, and the breaker is doing exactly what it's built to do.



Here's the math that explains most of it. A standard portable space heater pulls about 1,500 watts, which on a 120-volt circuit works out to roughly 12.5 amps. If that heater is running on a 15-amp circuit, it's already using more than 80% of everything that circuit can safely carry — before you've turned on a lamp, a TV, or anything else in the same room. Add a second heater, a vacuum, or a string of holiday lights sharing that same circuit, and tripping isn't a malfunction. It's the breaker doing its job.

Big Bear cabins run into this more than most houses for a simple reason: a lot of them still have panels sized for how a mountain cabin was used decades ago, not for how one gets used now. Space heaters in an unheated bonus room, an electric blanket, a hot tub, maybe a mini-split — none of that existed on the original load calculation when the panel was installed.

Cold does something else, too, that's easy to miss. Wire and metal connections contract slightly as temperatures drop, and if a connection inside your panel was already a little loose, that contraction can increase resistance right at the connection point — which shows up as heat buildup and, sometimes, a trip that has nothing to do with what's plugged in anywhere. This is one of the reasons a breaker that's never given you trouble before can suddenly start acting up the first hard freeze of the season, with nothing about your actual electrical usage having changed.

One trip is normal. Repeated trips on the same circuit aren't.

If a breaker trips once during a cold snap and resets fine, that's the system working as designed. If it's tripping repeatedly — especially on the same circuit, especially without an obvious cause like a space heater — that's worth an actual look rather than just resetting it and moving on. A breaker that keeps tripping is trying to tell you something: either the circuit is carrying more than it's rated for, or something inside the panel or wiring itself has degraded to the point where it's not handling load the way it used to.

The fastest way to isolate it yourself: unplug the space heater (or whatever else is running) and reset the breaker. If it holds, you've found your culprit, and the fix is usually as simple as moving that heater to its own dedicated circuit. If it trips again with nothing plugged in, or if you notice any burning smell, warm outlet covers, or a breaker that feels hot to the touch, stop there and call someone — that's not an overload problem anymore.

For cabins that see this every winter without fail, the real fix usually isn't a new breaker. It's confirming the panel actually has the capacity for how the place is being used today — heaters, a hot tub, maybe a generator transfer switch — rather than how it was wired the year it was built.

Give us a call if your breaker won't stop tripping this winter.

(909) 415-5573.