We built a new home and installed two Square D QO panels with plug on neutrals. One is fed by a whole house gen/ATS, the other directly from the utility. Both panels have a mix of dual function, AFCI only, and thermal magnetic breakers. Most all circuits are on the dual function breakers, only a few are AFCI or thermal magnetic. Each panel has a plug in Square D transient protector.
On the first occasion, before there were any AFCI breakers in the panels, ALL the dual function breakers tripped (both panels). None of the thermal magnetic breakers tripped. Once this occurred, we added AFCI breakers to the frig and generator battery charging circuits. I called the utility company after this happened and they told me they had an issue but did not elaborate.
On the second occasion, about 6-months after the first occasion, all dual function breakers tripped (both panels). None of the AFCI or thermal magnetic breakers tripped. This trip occurred during a storm which resulted in a utility outage of several days.
We have had no other tripping issues.
I'm convinced these trips are utility related but I was hoping others can confirm or share thoughts on other possible causes.
Thanks in advance.
On the first occasion, before there were any AFCI breakers in the panels, ALL the dual function breakers tripped (both panels). None of the thermal magnetic breakers tripped. Once this occurred, we added AFCI breakers to the frig and generator battery charging circuits. I called the utility company after this happened and they told me they had an issue but did not elaborate.
On the second occasion, about 6-months after the first occasion, all dual function breakers tripped (both panels). None of the AFCI or thermal magnetic breakers tripped. This trip occurred during a storm which resulted in a utility outage of several days.
We have had no other tripping issues.
I'm convinced these trips are utility related but I was hoping others can confirm or share thoughts on other possible causes.
Thanks in advance.