OK - I'm stupid and/or lazy on occasion. I have a number of things fed by one 15a circuit - lighting, computer, radio, plus a power stirp for occasional plug-in stuff. No problem for 6 years.
That circuit was the most convenient spot for a space heater by my bench [cold feet]. No problems with the circuit. And then, also for my new work sharp. When I had the the heater and lights on, and then put worksharp on and under heavy load [wide chisels, or regrinding new bevel] , the breaker would pop.
I'd turn off the heater, finish with the worksharp, turn the heater back on.
Then, I'd do it all again - forgetting that the worksharp might pop the breaker.
In 2 weeks, I probably popped it 10 times. Then, I finally got the parts to make an extension cord the correct length, and ran it from a different circuit to the worksharp.
However, the heater now causes the breaker to pop occasionally. Which never happened before the worksharp.
Did I wear out the breaker?