Why Your Breaker Keeps Tripping (And When It Is Actually Dangerous)
A breaker that trips is doing its job. The question is what it is protecting you from — an overload, a short, …
A GFCI — ground fault circuit interrupter — compares the current leaving on the hot conductor with the current returning on the neutral. In a healthy circuit they match. If roughly 5 milliamps goes missing, that current has found another path to ground, and the most alarming candidate for that path is a person. The device cuts power in a fraction of a second.
Five milliamps is well below the level that causes a person's muscles to lock onto a conductor, and far below what disrupts a heartbeat. That threshold is why these devices work.
Where GFCI protection is required
Requirements have expanded over successive code cycles, and generally cover:
- Bathrooms
- Kitchen countertop receptacles
- Garages and accessory buildings
- Outdoors and anywhere exterior
- Crawlspaces and unfinished basements
- Laundry areas and near sinks generally
- Pool, spa and hot tub equipment
If your home predates these requirements, you are not obligated to retrofit, but it is inexpensive protection and we recommend it in every wet location.
Why several outlets die when one GFCI trips
A GFCI receptacle has line terminals and load terminals. Anything wired downstream of the load terminals is protected by that device — and shuts off with it. This is why a tripped GFCI in the garage can kill outlets in a bathroom, on a porch, and behind the refrigerator, all at once.
If a group of outlets is dead and no breaker has tripped, go find every GFCI in the house and press reset. Check the garage, the exterior walls, bathrooms, the laundry room and any unfinished space. It is the single most common "no power" call we get, and it is free to fix yourself.
Why yours keeps tripping
Moisture. The most common cause by a wide margin. Rain in an exterior box, condensation, a leak under a sink. Dry it out, and fit an in-use weatherproof cover outdoors.
A failing appliance. Motors and heating elements develop insulation faults as they age. Unplug everything on the circuit, reset, then reintroduce devices one at a time.
Long circuit runs. Very long branch circuits accumulate small amounts of natural leakage that can approach the trip threshold, especially in damp weather.
The device itself. GFCIs have a service life of roughly 10 to 15 years and fail eventually. Some newer ones deliberately refuse to reset when their internal test fails, which is a feature.
A genuine wiring fault. A nicked conductor or a neutral touching a ground somewhere in the circuit. This one needs tracing.
Test them monthly
Press TEST; power should cut. Press RESET; power should return. If TEST does nothing, the device is not protecting you and should be replaced. It takes ten seconds and most people have never done it.
GFCI and AFCI are not the same thing
AFCI — arc fault circuit interrupter — detects the signature of arcing, the kind produced by a damaged cord or a loose connection, and is aimed at fire prevention rather than shock prevention. Modern requirements call for AFCI protection in most living areas. Dual-function devices provide both. If your panel has neither, that is worth a conversation.
For GFCI installation, nuisance trip diagnosis or a full electrical safety inspection, call (866) 651-5242.