An employee was starting work on a precipitator and was using a sleever bar to remove the door, which was 18" x 18". He removed the bolts and some of the silicone from the door, but the door would not open. He went to the front of the equipment, removed the inspection window, and used the sleever bar to reach inside, at which point he was electric shocked. The electrical current went in his left ring finger and out through his right foot.