Questions tagged [afci]

Arc-fault circuit interrupter are safety switches, similar to GFCI, that are used to detect electrical arcing and shutoff power to prevent the risk of fire.

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24
votes
6answers
109k views

Where should I NOT use a GFCI or AFCI?

There is a lot of information out there about the benefits of GFCI and AFCI and the places where they must or should be used. But are there any circumstances where you're better off without them? If I ...
9
votes
5answers
23k views

Should I use a GFCI or AFCI circuit breaker with knob and tube wiring?

My American house was built in 1942, and much of the wiring is still knob-and-tube wiring (2-wire, no ground). Over the years new modern wiring has been added to the house, but we still have some KnT ...
17
votes
3answers
3k views

Bosch Drawer Microwave causes ARC Faults

I have a brand new Bosch Microwave (model: hmd8451uc) installed as the only device on the entire circuit. Anytime I use the Microwave on this circuit, it triggers the breaker's ARC Fault. Breaker (...
11
votes
5answers
17k views

What could be causing AFCI breaker and GFCI receptacle nuisance tripping?

I have a very unusual set of electrical issues that have proven difficult to troubleshoot. I live in a newly constructed house. Each bedroom has AFCI breakers. In the past 3 years living there, the ...
7
votes
5answers
12k views

Why does my microwave trip my AFCI only when it's mostly empty?

I live in a recently redone home and I'm having a very odd electrical issue. My microwave is intermittently tripping a combination arc fault breaker only when it is mostly empty, e.g. one slice of ...
5
votes
2answers
19k views

AFCI breakers/protection and refrigerators - a bad idea?

The 2014 NEC requires AFCI protection for refrigerators. I've read that one shouldn't use GFCI protection for a refrigerator, but I know that AFCI breakers do include ground-fault protection (at a ...
3
votes
2answers
19k views

Why use AFCI receptacles rather than AFCI breakers?

Is there any reason to use an AFCI receptacle rather than replacing the breaker with an AFCI type? It seems that providing protection on the whole circuit makes much more sense than to just one ...
8
votes
3answers
13k views

What should I do if my vacuum trips my AFCI device?

I have a vacuum that trips the AFCI device of the circuit that services my bedroom. The vacuum has some age on it, and there is some wear on the motor's commutator. This wear causes electrical ...
2
votes
2answers
2k views

Upgrading 2 breakers to AFCI, always trips

I'm doing some electrical work in the upstairs bedrooms, and part of the permit is to add AFCI protection. The house was built in 1968, has a 100A service and a Square D breakers panel. Currently ...
6
votes
3answers
13k views

What should I do if the AFCI breaker neutral pigtail is too short?

I am wiring a house that I built, and code says I need an AFCI for the bedroom circuit. The panel that I will be installing this AFCI breaker in is a subpanel, so my ground/neutrals are on 2 ...
5
votes
4answers
30k views

What rooms or loads require AFCI protection?

Do I need AFCI for dedicated circuits like sump pumps, furnaces, microwave, refrigerator etc.
2
votes
2answers
997 views

AFCI trips when neutral and ground touched

Is this normal? I find an answer here that this is normal but I do not understand. Can anyone add an explanation, please. AFCI is Square D 20A HOM120CAFIC, Issue No. DP-3640 HACR Type
2
votes
2answers
4k views

What options are there to achieve both grounding/ground-fault and arc-fault protection on old 2-wire circuits?

The three receptacle circuits in my house are 2-wire NM, but have 3-prong receptacles. My electrician recommended and installed GFCI breakers to provide "grounding" to these circuits. I now realize ...
1
vote
2answers
902 views

Diagnosing frequent trips on arc fault / ground fault (dual) breakers

During recent work we've been upgrading breakers to dual arc-fault / ground fault. Square D QO series (USA). I've noticed a couple of them tripping pretty frequently when certain appliances are used. ...
0
votes
2answers
18k views

Where should arc fault breaker not be used?

I'm trying to stay on top of the electricians rewiring our house and correctly interpret the NEC 2017 for arc fault breakers. There is a permit and an inspection when they done, but I want to ...
0
votes
0answers
1k views

Hot/Neutral reversed at receptacles after AFCI breaker was installed, can AFCI still work correctly?

Starting condition: I have 3 outlets in a room and 2 of them have Hot and Neutral reversed. Change: The electrician came in an installed AFCI breakers At my request, they also changed the outlets to ...