STANDARD MOUNTING PLATE INSTALLATION INSTRUCTIONS . GROUNDING WIR GROUNDING SCREW | ยข CAUTION:DISCONNECT POWER DURING INSTALLATION you are replacing an existing fixture, disconnect and remove the old fixture. Expose the supply wiring from the outlet box. 2. )Thread the machine screws into the opposite side of the mounting plate from the green ground screw. Lock the machine screws into place with lock nuts. the mounting plate to the outlet hox using the two screws supplied with the outlet box.