How worthwhile is it to install dual-function CAFCI / GFCI outlets rather than going with ones that are just GFCI? Is it a significant increase in safety factor?
Electrical – AFCI – worth installing and not just GFCI
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Related Solutions
Some surge protectors work by "redirecting" surges to the equipment ground, which is pretty much the definition of a ground fault. In this case, it's definitely possible that surge suppressors could be tripping GFCI receptacles/breakers (given a large enough surge).
As for the AFCIs... When electrical contacts separate, they often create an arc between the contacts. This arc spans the gap until the contacts are too far apart, and the arc can no longer be sustained. It's possible (in theory) that the GFCI tripping could create a large enough arc, for long enough to cause the AFCI to trip. It's not likely that a properly functioning GFCI would do this, but if the GFCI was old and worn it could be opening the contacts slow enough that a detectable arc is being produced.
Determining if the GFCI tripping is causing the AFCI to trip, is a simple test. Simply press the test button on the GFCI. If the AFCI trips, you'll have figured out half the problem. If the ACFI does not trip, you could repeat the test using a receptacle tester with a GFCI test function.
If it's determined that the GFCI is causing the AFCI breaker to trip, replacing the GFCI receptacle may resolve that part of the issue.
Figuring out if the surge suppressor is tripping the GFCI, is a more difficult proposition. It will likely require you to monitor the supply voltage over some time, to identify and document possible surges.
Your plan will work. Some AFCI's have length restrictions to the first outlet Branch circuit 50' for 14 awg wire and 70' for 12awg NEC 210.12.A.3.B & 210.12.A.4.B. using one installed at the first outlet and installed according to manufacturer instructions you can complete your plan within code.
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Best Answer
They protect from different things.
AFCIs are primarily about preventing fires started by electrical arcs. They were (IMHO) not ready for prime time when they first hit the market, I think they have gotten better (certainly fewer "my vacuum won't run on this circuit" stories these days. But not zero, I see on a quick look.) If you happen to be in a jurisdiction like Chicago that runs everything in metallic conduit for the same reason, not much incentive to change to them unless required. Contrariwise, if you have doubts about the integrity of your wiring, they might be a Very Good Idea, even if not required.
GFCIs are primarily about (not) shocking people.