the installation of explosion proof equipment is to creat a heat sinc which allows the ignition inside to cool off enough to stop ignition of the outdide atmosphere. the switch boxes are mated to their covers and should never be mixed up. at the factory they are mated individually. but my real question is: doesnt this look like a sump and if so the entire pit (which the guy in the photo is standing in ) could and probably does fill with liquid until the sump can catch up with the incoming liquid. if so why put thew electrical installation below the top edge of the pit?
