I had an interesting thing happen the other day. While on a shoot I was setting up my Norman 20/20 with two lights. As I was taking flash meter readings I heard a loud bang. I looked at the power pack and heard another loud bang, saw the flash cord fly out of the pack and saw a three inch flame shoot out of the pack. The connections on the pack and the flash cord were cooked and fortunately I was not. Any ideas as to what happened or has anyone had this happen to them? Just another fun shooting experience. Ken