How To Install a 3-way Switch Option #2

Wiring Option 2

Option 2. Fixture Controlled by Two Switches: Power Through Light
Two three-way switches control one light with the electric power coming through the light on a two wire cable. In order to code the white wire, which is used as a power wire from the light fixture through the switches, black electrician's tape is wrapped around the wire in the boxes. This way, if you or someone else goes into the boxes for repairs, the white wire taped black will indicate a hot wire. Even when taped black, the white wire may never be used to bring power to the fixture terminal. The red traveler (switch) wire runs just between the two switches, not the light. Note connections of the ground wire.

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