ECN Forum Forums General Topics of the Trade General Discussion Area POP sound in panel what is it?

Im rewiring a 100 year old home that has 100 amp pushmatic panel in it. Im temporarily tighing in a 20 amp circuit in for a bedroom.

Im pretty sure i have the answer to this question but want to make sure. I tighed in the new 20amp circuit but the breaker was off i then turned the main breaker back on and heard a pop sound so i quick shut the main off again.

I forgot to turn off alot of the branch circuits before i turned the main back on so was that the pop i heard because of the load? There was nothing on in the house just the fridge and the lights in the basement.

I first thought there was a short in the circuit i just ran because i had to use wiremold thinking i chafed a wire. I only hooked the circuit up to the breaker and the neutral to the ground bar i never turned the circuit breaker on so i dont see how that is the problem.

So was this pop sound because of the fridge and light loads? Nothing was burning or smelled burnt in the panel.

So at the end i turned off all the branch circuits and then turned the main on then each branch circuit without any pop noise.