Disconnectthe three wires from the three-way switch. Connect the wire from the common lug to the switch leg of the two-way switch, and connect the traveler leg that was hot from the test above to the power leg of the two-way switch. Carefully, tuck the wires into the box. Reinstall the switch screws and cover plate. 0000 - How do you wire a 3 way switch using 14 2 wire?00:47 - Why does my light switch have 3 black wires?01:14 - What is the common wire in a 3-way switch? 4Steps to Wire 3-Way switches. 4.1 Turn off your circuit breaker. 4.2 Mount the electrical box. 4.3 Feed in your cables. 4.4 Connect the wires and switches. 4.5 Wiring3 way switches seems to be the most popular topic so I've included lots of diagrams for those. Three-way switches allow you to control lights or receptacles from two points. These are commonly used for lighting in a stairway where you want a switch on each floor entering the stairway. Three-way switches are also common in hallways Electrical101. This 3-way switch wiring variation was used as a way to wire 3-way switches and be able to supply line voltage and lighting load to either switch switch box. This configuration is no longer allowed if a neutral is not present in each switch box. This wiring option is sometimes seen in certain commercial environments. Towire a 3 way light switch, you'll need 2 3-way light switches, 2 2-wire non-metallic cables, 1 3-wire non-metallic cable, and 2 6-inch grounding wires. First, run a 2-wire cable from the wall power to the black screw on 1 of the switches. Then, connect the 2 switches by splitting the 3-wire cable apart and attaching each of the 3 wires to 3Way Smart Switch Wiring Diagrams. The installation instructions and diagrams for some smart switches are fairly simple for both single pole and 3-way wiring. The Lutron brand of switches fall into this category. They even have a wireless line-side 3-way switch that does not connect to any wires, just mounts to the line side 3-way switch box. Ina smart switch 3-way configuration, a smaller charge is looped through the add-on switch. Some things to know: 3-way wiring for smart switches is different than standard 3 way wiring. You cannot use dumb 3-way 5cguJ.