Three way switch hook up
In the diagram below, a 2- wire NM cable supplies power from the panel to the first switch box. It ties into the common on the left switch. The lower left screw is the common and gets the black wire from the source 3-cond.
The white wires tie together with a wire nut. The white neutral wires are connected together in each switch box. The upper left screw gets the red wire from the left box 4-cond.
Diagrams shown on this page are simplified for clarity. As long as you keep this in mind, a 3-way circuit becomes really simplified.
The upper right screw gets the red wire from the right box 4-cond. What is common in the diagrams above and with any 3-way switch circuit is that the power hot wire coming into the circuit will always go to the common terminal of the first switch.
See Actual Switch Box Wiring. Alternate 4- Way Switch Wiring. Alternate 3- way Switch Wiring Diagrams Line voltage enters the light fixture outlet box. The source power black wire is coming in from the left.
Electrical outlet boxes can have numerous NM cables going in and out. Be sure to attach a bare copper wire to the green screw on the switch. When wiring a 3-way switch circuit, we will be using a 3-wire cable known as romex coming from the source such as the breaker box.
Alternate 3- Way Switch Wiring. Line three way switch hook up enters the first 3- way switch outlet box, light fixture is located between switch boxes. Motion Detectors and Occupancy Sensors.
Wiring a 3-Way Switch
No longer allowed after NEC if no neutral wire in switch boxes Line voltage enters the first 3- way switch outlet box, light fixture is located between switch boxes. When the left switch is toggled, it connects to the upper circuit and now the circuit is open at the right switch which turns off the light.
The upper right screw gets the black wire from the zipcar dating box 4-cond. A 3- wire NM connects the traveler terminals of the first and second 3- way switch together. With conventional wiring, line voltage enters the first 3- way switch box. And of course the neutral will cliche dating lines go directly to the load.
Follow along with the mouse pointer as we go through this. It should also help in three way switch hook up the functions of each type of switch. Black common wire is usually wrapped around the two traveler wires on a 3- way switch.
The black line wire connects to the common terminal of the first 3- way switch. At each end of a hallway.
Notice that there is a 3-conductor cable coming into the first box, then a 4-conductor cable going from left box to right box, then a 3-conductor cable going from the right box to the load.
If you're simply replacing a 3-way switch, the diagrams below will show the different scenarios on how your circuit could possibly be wired.
Ground connection diagram is shown separately. The bare copper wires tie together with a wire nut. The lower left screw is the common and gets the black wire from the load 3-cond.
Traveler wires are interchangeable on each switch. The upper left screw gets the black wire from the right box 4-cond.
Each 3-way switch in these examples are controlling the power source to the same load. Ceiling Fan Switch Wiring.
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