I was hooking up my girlfriend's dryer, but I had to switch the wall outlet from a non-grounded to a grounded power box. I went and shut off the breaker and removed the old box. I was going to test it out so I turned the breaker back on but then my phone rang. Talked for a minute, then crawled back behind the dryer to make an adjustment. I had thought to my self, "did I turned the breaker on?" but was sure I hadn't since I hadn't tested the dryer yet. I went back to re-securing the ground wire when a hot wire touched the neutral wire and all hell broke loose. (Keep in mine I'm in a crawl space about 2 feet wide and only about 5 feet high - a hole) The instant those wires touched there was a huge explosion of sorts, an extremely bright and blinding light, and sparks were going everywhere and burning me. The closest I could compare this to would be trying to weld something in a small space like that with no mask as that's essentially what I was doing. 220V going to that screwdriver and the tip was what was being welded.
The flash lasted about 1 sec, but the sparks were
everywhere for about 5 secs i guess. I was frantically brushing them off me and out of my hair. Again, small crawl space, can't even move back there. All the hair on the side of my hand and arm is burnt off. I went and shut off the breaker and finished the job. Surprisingly it didn't trip it.
The screw that held the neutral wire is now there for life. It was melted down like a big wad of solder and the screwdriver's shaft is all black and the tip is melted with a big notch melted out right in the center of the shaft.
Scared the shit out of me!

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