PC-038 HAD A BROKEN PIN ON THE 480 VOLT DUST RECEPTACLE COVER. AS EE TRIED TO REMOVE THE BOLTS THAT HELD THE GEAR MOUNT IN PLACE HE DISCOVERED THAT THE NUTS ON THE INSIDE OF THE POWER CENTER WERE TURNING. EE HAD NOT DE-ENERGIZED THE POWERCENTER BEFORE TRYING TO REMOVE THE ACCESS PANEL.WHIEL MOVING THE ACCESS PANEL THE 480 VOLT PRIMARY SIDE CAME IN CONTACT WITH GROUND.