Last week I reported having some issues with my breakers tripping when I transmit with my amateur radio at anything above fifty watts. I have found the problem. It seems that Eaton, the company that made my circuit breakers, shipped out a batch of AFCI breakers that trip when exposed to strong RF interference.
Part 15 of the FCC rules state:
1) The device may not cause harmful interference.
2) The device must accept any interference received, including interference that may cause undesired operation.
I will be contacting Eaton on Monday.