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Materials and Tools:
Stat by turning off power at circuit breaker or remove fuse.
Remove wallplate and switch mounting screws.
Carefully remove switch from wall without removing wires.
Single-pole switch controls single location. This switch will have insulated wires connected to two screws of same color plus green ground screw.
Two-location control has two switches controlling one fixture. Both switches will be 3-way with insulated wires connected to three screws plus green ground wire; one wire is connected to screw of different color or labeled ‘Common.’
Tag 'Common' wire on both switches to identify when wiring.
If three switches control fixture, two will be 3-way and one will be 4-way.
A 4-way switch has insulated wire connected to four screws plus green ground wire.
Tag two same-color insulated wires connected to opposite colored screws.
Disconnect switch wires. If wires are aluminum, stop and call electrician.
Connect green ground wire on dimmer to bare copper or green ground wire in wall-box.
First single-location wire goes on black screw terminal on dimmer, second goes on brass screw; no wire goes on blue screw.
For two-location dimmer, tagged wire goes on black terminal, second wire goes on brass, third on blue.
For companion two-location dimmer, tagged wire goes on black, same color wire goes on blue, remaining wire goes on brass.
For three-location dimmers, install one dimmer and two companion dimmers.
Two tagged wires connect to blue terminal, one to screw and other to push-in terminal; third wire goes on black screw; fourth wire goes on brass screw.
Tuck wires carefully into wall-box.
Mount and align dimmer and companion dimmer(s).
Install wall plate.
Turn power back on.
Before replacing bulb, cut power to dimmer.