Had my first experience with an ark fault problem that was not a simple ground touching neutral or mixed up neutrals, the other day. Traced the problem to a loose compact fl lamp in a recess can. The screw in type lamp that looks like a twisted ice cream cone. Once I tightned up the lamp the problem went away and the circuit breaker was able to hold the entire load of the circuit ok. This was no ground fault situation, but rather an ark of sorts. I say of sorts, since the ballast for that lamp is in the base. Must have looked like an ark to the breaker.
