Ground Fault Troubleshooting

Most electrical problems announce themselves before they become serious, in a vocabulary worth learning. A warm faceplate means resistance where there should be none. A burning smell means something is already past the temperature its insulation was rated for.

Flicker across the whole house points upstream toward the service, often at a loose neutral. Flicker on one circuit points at a termination on that run. The distinction matters because the first one is urgent and the second one usually is not.

Breakers that trip repeatedly are the system working correctly and telling you something. The useful question is which of four things it is: overload, short circuit, ground fault, or a weakened breaker.

A series arc happens along the length of a circuit, at a loose termination or a broken strand, and the current passing through it is limited by whatever load is downstream. It can be a small current and still run hot enough to ignite wood, and because it does not exceed the breaker rating, a conventional breaker never sees a reason to trip.

A parallel arc is a fault between conductors or to ground, which draws a much larger current and usually does trip something, though not always fast enough where the fault is intermittent and self extinguishing.

Arc fault breakers exist because the series case was invisible to everything else in the panel. They look at the electrical signature rather than the magnitude, which is why they can catch a damaged cord or a nicked conductor that a standard breaker would carry happily until the wall caught.