How To Remove Metal Electrical Box From Wall. Untwist any wire connectors from wires inside the box.; If the box is installed in the ceiling, two nuts in the top of the box may be holding the box in place.
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Look inside the metal junction box for where the wires enter.; Disconnect the circuit cable from the electrical panel if you don't plan to. Make the hole dimensions 2 or more inches bigger than the box so you can access the nails holding the box to the wall.