Question about Solar 15 Amp Murray Afci Circuit Breaker

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I have 5 murray combo arc faults installed in a home and 3 trip consistently for no reason. i installed cutler hammer combo arc fault breakers and have to trips. is there a difference between manufacturers?

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  • joe_nicole_m Jul 04, 2009

    Thanks. I have tried this suggestion, with the same result. I have installed Cutler Hammer combo arc faults and they do not trip?? Just the Murray ones. However, it is a Murray panel and the inspector will only allow Murray breakers in it.

  • James Smith May 11, 2010

    I am curious if there are any GFCI outlets connected to any of the circuits that are powered by the arc faults in the panel.

  • Bob
    Bob May 11, 2010

    AFCI's have been a PITA ever since they came around. Are you able to read the Murray LED indicators? If so, how many and which led's are lit? Is this a service upgrade on an existing home or new construction? Taking one circuit at a time, remove the black, white, and equipment ground (bare) wires of each cable from their terminals. Make sure the bare wire isn't touching anything metal. Using an ohm meter, test between black to white, black to bare, and white to bare. There should be NO continuity between any of those wires.. Do that for all circuits concerned. Another thing to consider, if this an existing wiring system, is that since you are using combo afci's, you may have loose connections on the circuits that are arcing. In that case you will have to go to each outlet and inspect all the connections. If you have to do that, it's best just to go ahead and replace the devices while you're at it. Another possiblity is to go back to the store where you purchased the Murray panel and talk to the manager. Tell him/her that you want to return the POS Murray panel (regardless of the fact that's it's punched full of holes) and swap it for a Cutler-Hammer. If they balk at that, then tell them you want 5 Murray combo AFCI breakers that _work_. I know that would be a lot of work, but it will get your inspection.

  • Bob
    Bob May 11, 2010

    Remove the wire from one of the breakers that is tripping and (temporarily) connect it to an AFCI breaker that isn't tripping. If it trips that breaker, there is a problem with that circuit. AFCI circuits can be a real pain as it doesn't take much to trip them. Did the breakers that are tripping work OK at some time in the past, or are these newly installed circuits?



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The arc fault breaker must be made for the panel. Use of a breaker (any type of breaker) that is not either listed or classified for use in the panel is a code violation. Yes there are some differences between manufacturers. Compare specs. Make sure you installed the new breakers correctly, or they won't work at all anyway. Just because a breaker fits doesn't mean it's the right one for the panel.

Posted on Jul 04, 2010


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The best answer I can give is a new breaker might solve the problem.If the arcing has not damaged the bus bars where the main breaker is connected. Be sure to check to see that all connections are tightened properly. If you are using aluminum wire be sure to use a deoxidizing compound. Tighten the aluminum connections, wait a while, and recheck tightness.
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