Originally Posted by Mr. Dan
... plus sometimes a breaker will not look like it's tripped but it is. I think one should turn off the suspected breaker and turn it back on.
You are so correct about that. I always turn them off even if they don't look tripped. I've been doing it for so long that it's just second nature to me. I don't even think about it, I just flip them off and back on. You also get a feel for the breaker operation like that too. I've found many bad breakers just by the way they feel when tripping and resetting them.