I had burned out burner on my double wall oven. When I removed the burner one of the terminals was melted and the wire did not come out of the back of the oven with it. I did not have the lower oven on so I did not think that there was power going to the wires. Upon fishing around for the wire with a metal rod the breaker tripped. Had no idea that the wire was hot. I found the wire, replaced the end on it the burner. It is like new again but I never would have thought that the power was hot in that bottom oven so my advice would be to always turn the breaker off before fooling with anything like this. This could have been really ugly.