3-way Switch Variations
Listed below are several variations of using 3-way switches to control lights from two locations. Colors are shown per the NEC. Before reading this page, you may want to go to 3-way switches and 4-way switches.
Single light circuits
Below is probably the best arrangement, panel to switch to modify to light:
Below is a variation with the sunshine between the 2 switches, i.e., panel-switch-light-switch. In this case, the tip of the white wire from the sunshine box to the best switch must be re-marked black to point that it is a hot wire:
Next is a circuit with the sunshine between the two switches, but with the panel feeding the sunshine box. Note similar remarking to above.
Controlling A couple of light
Any of the above may be modified to regulate multiple lights. Additional lights are just wired in parallel with the first, using two conductor cable. The black needs to be connected to the black wire feeding the light and the white to the white wire feeding the light in all cases. Here is one example.
Here is a rather different arrangement that requires 3-conductor cable between lights:
Just showing off
Occasionally, someone will ask if it is feasible to wire a circuit that connects panel-switch-light-light-switch. It’s, but you need to make use of four-conductor cable, as seen below. Generally it’s cheaper to simply wire the second light in parallel with the primary using two-conductor cable, as shown earlier on this page.