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Thread: AFCI breakers tripping every 7 days

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    Default AFCI breakers tripping every 7 days

    We have a new addition to our house with its own subpanel. Since it is a bedroom the outlets and lights are on their own two 20Amp AFCI breakers. We now narrowed it down to these two AFCI breakers tripping every 7 days at roughly the same time (from the time they were last reset). In the beginning we did not pay close attention but it always seemed roughly a week. Now it tripped again this evening, 7 days (within the hour) since we last had to reset it. It has been doing this even when the new room was not occupied and there was practically no load. Yesterday I disconnected the Smoke Detector because I thought it might do a self test every 7 days. But it still went out today. We have three dimmers on there and they control recessed lighting as well as one ceiling lamp with 3 or 4 light bulbs. Initially while no one was living there, there was no other load (yet a week later they had tripped). Now there is a small refrigerator in the room, plus a TV, a cable box, a micro wave, toaster and a lamp (there is also a Gas Fire Place with low voltage ignition). One would think that it has to be a device that keeps track of time and does a certain function every 7 days that will trip it. Have you ever heard of such a thing? Are recessed lights that touch the insulation known to cause any trouble? I just don't know of any device in that room that has a circuit that does things on a weekly basis (on the 7th day) after it was turned on. And we replaced both breakers once.
    Last edited by hmk123; 06-23-2008 at 09:53 PM.

  2. #2
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Default See Genesis 2:2

    I gather they trip 7 days after reset, not on a particular day? Do they both trip at the same time? I don't know enough about how an AFCI breaker works to say whether this is a possible explanantion, but I'm wondering if there's something happening on the service side of these two breakers that makes the AFCI breakers think there's an arc fault on the load side?

  3. #3

    Default

    Yes, they do both break at the same time. There are three AFCIs in the panel. The two outer ones break at the same time. The middle one stays. They used to be all 15s and we replaced the two outer ones with 20s. The one in the middle is actually used for the 2 outlets in the bathroom. One would think they need to be GFCI but they are not. There is one GFCI outlet near the wet bar. I just double checked and the fridge and toaster, etc, are not on one of those two AFCIs that keep tripping. So only the bedroom outlets and lights are on those two AFCIs. One is for the lights, the other one for the outlets. If this week is an indication, you can almost set your clock based on it. I talked to Square D (who makes our breakers) and the guy talked about a leak current that can trip them. But I assume that is not something that builds up over time, right? And how would it always need exactly a week? Again, the strange thing is this already happened when there was no one living in there yet and there was only occasional load on it. And yes, it is not the same day every week. It is 7 days to the hour after your reset them.

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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Default

    By "inner" and "outer" I assume you mean the 3 breakers are in line on one side of the panel's 2 columns of breakers. If so, try swapping one of the outer 20A breakers with the inner 15A -- just unplug them and interchange their positions. This will place the now-outer 15A and 20A breakers on the same leg of the panel, and perhaps tell us if it is in fact something to do with the service, if the 15A breaker starts to act up.

  5. #5
    Like an engineer alternety's Avatar
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    Default

    Are those dimmers by chance the kind that can be controlled remotely over the power line? Do you have any household automation components installed?

    Is it possible to remove everything from the circuits (unplug any thing in the outlets, unscrew bulbs, etc.) for 7 days to see what happens? Use some extension cords from other circuits (being careful about loads so you don't trip other breakers). If it still fails you now know it is not a faulty load that you know about. If it does not happen, put things back one at a time until it happens.

    You said there were three in a row and the two outside ones trip. That probably means they are both on the same leg of your power service. It may be useful to exchange the wire of one tripping breaker to the non-tripping one.

  6. #6

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    We do not have any household automation installed. But I will check to see if the dimmers could be controller remotely. Do they contain any circuits?

    Using extension cords is a good idea. I think we will try that. What about the dimemrs? Do they need to be uninstalled? They seem to have a little light in there when they are turned off.

    Would it make sens to try AFCIs from a different manufacturer?

    Swapping the AFCIs might also be a good try (using the other leg). Also, a friend said I should put a night light on the 15 A one currently in the middle and see if this trips it, too.

    It will be interesting if they trip again this Sunday at 8:45pm. Will be exactly 7 days. That's what it did last time. Am just wondering how it can be so precise without something "knowing" about time that then gets reset.

  7. #7

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    I also just found out that there is an outside receptacle on the one breaker and it is a GFCI receptacle. Can that cause problems? Then again, I would not assume it to trip after exactly 7 days. Right now I suspect the dimmers to be the problem.

  8. #8

    Default I am having the same problem.

    Has anyone figured out what a common cause might be? I just built a new home and did the electrical myself (I am not an electrician). I have 3 afci breakers for 3 bedrooms and all 3 trip every 7 days, losing a day each week (first Sunday, then Saturday, then Friday, now today, Thursday). I don't have a GFCI breaker problem like the first guy so PLEASE HELP!!!!!

  9. #9
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Default Oh, no, not again, Mr Bill!

    Do they trip independently, or all together?

  10. #10
    Electrician Johnny C's Avatar
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    Default AFCI tripping

    Reading your first posting of the problem, you mention that a small refrigerator is plugged into one of the AFCI protected outlets. Most modern refrigerators have a timed cyle that energizes electric heaters to defrost the freezer coils. The electric heaters usually have leakage current that may add to other leakage currents already on the circuit and cause the breaker to trip. Unplug the refrigerator and use a different circuit and see what happens.

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