
located at the end of the circuit three wire cable runs between the switches and 2 wire cable runs to the light 3 way switch wiring the black line wire connects to the mon terminal of the first 3 way switch a 3 wire nm connects the traveler terminals of the first and second 3 way switch together traveler wires are interchangeable on each switch the mon terminal of the second 3 way switch connects to the light fixture s add an electrical box for the second three way switch in the basement it s likely you ll also need to replace the existing switch box with a larger one to ac modate the extra wires for the three way switch feed a length of 14 3 type nm cable or 12 3 if you re connecting to 12 gauge wire p div class b factrow b twofr div class b vlist2col ul li div author cassidy smith div li ul ul ul div div div li all of the switches shown below are 3 way 3 way switches have three terminals.
one mon usually black color and one pair of travelers usually brass color with conventional wiring the mon wire from one switch connects to line the mon wire from the other switch connects to the load lights collection of leviton 3 way switch wiring diagram decora a wiring diagram is a streamlined standard photographic depiction of an electrical circuit it reveals the elements of the circuit as streamlined forms as well as the power and signal links in between the devices each 3 way switch in these ex les are controlling the power source to the same load when wiring a 3 way switch circuit we will be using a 3 wire cable known as romex ing from the source such as the breaker box then a 4 wire cable going between the two 3 way switches and then a 3 wire cable going from the switches to the load