Connect Ground Wire
Assuming you have a ground wire in your switch box it's time to connect it.
- If there is pre-cut insulation on the dimmer lead for the ground wire, remove it so you expose about 5/8" of wire.
- Place the dimmer ground wire next to the switch box ground wire and fasten with wire nut by turning clockwise.
- Turn the pair of wires until there is a slight twist in them both, then the connection is tight enough.
- Securing the connector with a couple of turns of electrical tape is a good idea but not required.