I have a small ups that I was going to have someone look at but haven't gotten around to it. I was at my brothers' company trying to figure out and label circuits for him and there was one We couldn't find for a good hour. We had a calcuator plugged into a receptacle and were watching it as We flipped the breakers. Nothing turned it off! The breaker He told me it was did not turn off the calculator. After insisting that it was the right one We shut it off and I pulled the breaker out of the panel. The calculator was still on & I tested the wire on the breaker and got 115 volts! A ups that was plugged into an outlet on that circuit was backfeeding the circuit through it's plug!
So, you never know what you might find!
Anybody got an Idea how that could happen?