On three-way switches, two terminals are the same color and the third terminal—called the common terminal—is a different metal or color.
If in doubt, hire it out.
Here I am showing how to hook some lights up in series.
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Electrical outlet boxes can have numerous NM cables going in and out.
The 3-wire cable consist of a black wire, a white wire and a bare copper wire, while the 4-wire cable has an added red wire which is hot as well.
Wiring a 3-way switch is a little more tricky than wiring a 2-way switch.
There is no way we can anticipate every situation and we do our best to inform of any risks for each job.
If the existing switch has a green ground wire, attach the wire to the green screw terminal on the new switch or to the electrical box.
Wiring a Light Switch.
The ground wire will always be attached in each box and flow right to the end fixture.