3 way switch diagram 2 above shows the electricity source starting at the fixture.
Three way electrical switch.
Three way switches control a light fixture from two locations in a room.
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The white wire becomes the energized switch leg as indicated by using black or red electrical tape.
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Diagram 3 above shows the electricity source starting at the right 3 way switch box the same that has the romex wire going to the fixture.
The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut.