Wiring A Three Way Switch With Power To Light First

Cap the wires connecting the source and the switch. At each switch in the above 3 way switch wiring diagram the black wire gets connected to the common copper or black screw.

3 Way Switch Wiring Diagrams 3 Way Switch Wiring Home Electrical Wiring House Wiring

Typical 3 way switch wiring nm cable in the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box.

Wiring a three way switch with power to light first. In this light switch wiring diagram the power feed joins the circuit via the light fixture where a two wire cable c2 runs from the light to the first 3 way switch sw1 and a 3 wire cable c3 joins the two switches. Use the black wire in the top 2 wire conductor to attach the switch to the source. The common screw may be located in a different spot on your 3 way switch than the location indicated in the drawings above but make sure that the wire indicated in the drawings to be connected to the common screw is connected to the common screw of the switch.

The correct wire must be connected to the common screw of a 3 way switch otherwise the switches will not control the light fixtures correctly. The ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box. 3 way switch wiring diagram depicting all wires in the ceiling junction box.

The black line wire connects to the common terminal of the first 3 way switch. Three way switch wiring where power connects to first switch and then the light. This first step will eventually send power directly to the light fixture.

A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. Three way switch wiring where power goes directly to the light. Make a j hook in the wire with a pair of pliers and wrap it around the black common screw on the light switch.

In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal. Grounding screws often are furnished with boxes and are green. Three way light switch with power feed via the light.

B connect the black hot wire coming from the romex cable that leads to your circuit panel to your new 3 way light switch 1 you will connect the hot wire to the hot terminal on the 3 way switch which is usually black and stands alone. B the wires from the power source may enter the light fixture box first then travel to one switch and then connect that switch to the other switch. Tighten the screw to secure it in place.

Light is controlled by two three way switches with the light between the switches and the power first going through a switch then to the light and onto the second three way switch. The hot source is spliced to the white wire which should be marked as being hot with black tap and run through to the common terminal of sw1 and from here the hot from the light is spliced through to the common. This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch.

The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch. In the ceiling light fixture electrical box one black wire from a 3 way switch gets connected to the black load wire on the light fixture.

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