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Easy to understand 3-Way-switch-wiring diagrams


3-way wiring



The 3-way-switch-wiring diagram is useful for seeing how things are wired.You can see how we use 12-3 Romex for 3-way circuits. Run 12-3 Romex from the first switch, to the light, then on to the next switch.


A picture is worth a thousand words, but this pic is kind of fuzzy, so here's the thousand words:

  • At the first switch, tie the white neutral wires together.
  • Tie the copper ground wires together.
  • Attach the red traveler wire to the travel terminal.
  • Attach incoming black wire to the bottom switch terminal.
  • Attach outgoing black wire to the top switch terminal.
  • At the light fixture tie the copper wires together.
  • Attach the red traveler wires together.
  • Code outgoing white wire hot by painting it black.
  • Connect incoming black wire with outgoing white wire that's coded hot.
  • Connect the white and black wires to the corresponding wires on the light.
  • Now on the last switch, connect the ground wire to the green ground screw on the switch.
  • Connect red traveler to traveler terminal.
  • Connect white wire coded hot to the switch's top terminal.
  • Finally, connect black wire to bottom terminal screw.


3-way-switch-wiring