Faulty Wiring

Christopher went to the basement where the circuit board of the house was to check the fault if there was any. Shocked to see that everything was fine and there was no sign of fuse getting blown. What the hell is happening? he thought. He searched for some faulty wirings while he tried switching the switches on and off again and again. It was a faulty wiring and he could see his shoulders getting light and with a sigh, he moved upstairs. He thought the bell rang and indeed somebody was on the gate. Who could it be?