Hi everybody, Few days ago, I randomly watched this very impressive video: high voltage fire I'm really surprised by this movie, could someone explain me how that is possible to happen? I think it happened in France. Thanx in advance for your replies.

I have a contractor that has a job doing a O2 storage tank room. Needs an exhaust fan, through the roof, switch and a light in the room. I don't feel comfortable giving a price, nor doing the work as I have zip experience with that level of explosion proof. Nor do I have the tools needed to...