Are you using a bedroom/den as an office? These rooms have a special breaker, an Arc Fault Breaker. I found this out the hard way when I put a surge protector in our front bedroom/office. The breaker tripped with just the surge protector. I had two that worked fine in CA, but both of them tripped the breaker here. I put a different surge protector in the room and no problem. My son's home in St. Augustine has similar breakers. When we were cleaning it, our vacuum cleaner tripped the breaker just turning it on. My son's Dyson did not. Go figure.
These breakers sense an arc and sometimes cannot differentiate from an arc in an electric motor and an arc from a real fault. So they trip on some normal activity. I think they are required by code in bedrooms.
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