Delayed Dual Purpose Breaker Problems

[John Marks]

I rewired this old Farm Cottage 5 years ago. (I am a licensed electrician)
Used QO panel with stab on neutrals
I installed all Dual Purpose Breakers
Initially I had to clear couple of Neutral/ground shorts, but after that fine.
next I had a problem with the new furnace, occasional (3 or 4 month) trips, finally had to put in a standard breaker as per HVAC Co. recommendation.
Now, fast forward 4 years:
Just started having random trips on various circuits, weekly.
No real pattern yet.
So, I’m not sure how to troubleshoot this.

Thanks.

 

[Little Bill]

A lot of the breaker Mfg have produced a revised version of the AFCI/GFCI dual purpose breakers. My first act would be to contact the Mfg, tell them the problem and ask them to send you new updated breakers.
Or you could go ahead and purchase the breakers then contact the Mfg.

 

[LarryFine]

Also, make sure your incoming voltage is even between lines to neutral, with varying loads.

 

[ptonsparky]

QO were a lot fun a few years ago. Make sure the replacements are the latest model.