An electrically insulative case includes a door arranged to move between an opened position and a closed position and a rack mechanism arranged to move between an ON position and an OFF position. The electrically insulative case further includes an interlock including a plunger arranged to move between a locked position and an unlocked position. The interlock also includes an engagement mechanism that is coupled to the plunger. The engagement mechanism is arranged to move between a first position in which the engagement mechanism is spaced from the rack mechanism and a second position in which the engagement mechanism is engaged with the rack mechanism. The door is inhibited from moving to the opened position when the plunger is in the locked position. The plunger is arranged to move to the locked position when the engagement mechanism is in the second position and the rack mechanism is in the ON position.