Things can go wrong in the breaker box. I was washing clothes once and I heard a buzz and a flash from where the breaker box was This was in a room about 15 feet away from The washer and dryer. When the landlord expect inspected he box, he found that the bus had become loose and shorted out the box the bar were all the wires connected had melted. It's a piercer overtime one of the lawyers has loosened up and Caused a short. Thank God I was home at the time