Three way light switch hook up

Published: 03.07.2018

The first switch location has an existing cable running to the light. References 1 The Family Handyman:

In position two, the switch cross connects the contacts on the left with the contacts on the right, in an "X" connection. It is advisable to use No. Number 12 gauge is required by code for kitchen and dining room receptacles, and other appliances washers, refrigerators, etc.

Install a 4-way switch by connecting one set of traveler wires, the set entering the bottom of the box, to the bottom set of brass-colored screws and the set of traveler wires leaving the box to the top set of brass-colored screws. Attach the hanging ground wire the pigtail to the green grounding screw. You may have to pry the box away from the stud slightly to create space for the blade. Connect the "switch leg" white wire with black tape to the remaining unused terminal screw on the switch.

Plan the wire path

Clamp the first electrical box to the wall. If originating from an electric panel or fuse box, 12 copper is the minimum size when connecting to a 20 amp circuit breaker or fuse; 14 copper is the minimum size when connecting to a 15 amp circuit breaker or fuse aluminum wire on circuits of these capacities has been prohibited for many years.

Use a stud finder to find potential obstacles, such as framing. You might find two cables in the existing electrical box instead of the one we show in Photo 1.

How to Wire and Install 3-way Switches

You want to zig-zag them, so they come about a bit like an accordion. The ground wire should be connected to the neutral terminal bar. Cables lacking a green insulated wire use the outer metal jacket as the ground conductor. Remove the cover plate to the existing switch the power is off. This page describes how to use 3-way and 4-way switches to control lights from two or more locations. Replace the covers for the switches, screw them into place, and turn the power back on to be in business.

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