Installing a Lutron dimmer switch safely requires turning off the power at the main electrical breaker and verifying zero voltage with a non-contact tester. Remove the existing wall plate, unscrew the old switch, and pull it out. Connect the dimmer's green ground wire to the bare copper ground wire in the box using a wire nut. Connect the incoming hot power wire to one of the dimmer's black wires, and attach the outgoing load wire leading to the light fixture to the remaining black dimmer wire. Secure all wire nuts, push the wires neatly into the junction box, screw the dimmer into place, and attach the faceplate. Verification: Restore breaker power and slide the dimmer toggle to confirm smooth, flicker-free light adjustment.
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