As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.
The door cannot be opened unless the disconnect switch is open, and if the door is open the disconnect switch cannot be opened.
The door cannot be opened unless the disconnect switch is closed and if the door is open the disconnect switch cannot be opened.
The door cannot be opened unless the disconnect switch is open, and if the door is open the disconnect switch cannot be closed.
The door cannot be opened unless the disconnect switch is closed and if the door is open the disconnect switch cannot be closed.
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