Hookup 3 way switch
The common terminal of the second 3- way hookup 3 way switch connects to the light fixture s. The lower left screw is the common and gets the black wire from the source 3-cond. 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.
Typical 3- way Switch Wiring Diagram. The upper left screw gets the red wire from the left box 4-cond.
Toggle the right switch and it connects to the upper circuit and now closes the path and turns the light back on and so on. 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. With conventional wiring, volts enters the first 3- way switch box. Follow along with the mouse pointer as we go through this.
Wiring a 3-Way Switch
The traveler wires go from switch to switch connected to the traveler terminals, it doesn't matter which. Wiring a 3-way switch is a little more tricky than wiring a 2-way switch.
Ground connection diagram is shown separately. The white neutral wires are connected together in each switch box.
Electrical outlet boxes can have numerous NM cables going in and out. Traveler wires are interchangeable on each switch. The white wires tie together with a wire nut.
No longer allowed after NEC if no neutral wire in switch boxes V enters the first 3- way switch outlet box, light fixture is located between switch boxes. At each end of a hallway. It ties into the common on the left switch. First of all we need to go over a little basic terminology on switches.
The diagram below will give you a better understanding how this circuit is wired. 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.
As long as you keep this in mind, a 3-way circuit becomes really simplified. The 3-wire cable consist of a black wire, a white wire and a bare copper wire, while the 4-wire cable has an added red wire which is hot as well.
Alternate 4- Way Switch Wiring. A 3- wire NM connects the traveler terminals of the first and second 3- way switch together. Each 3-way switch in these examples are controlling the power source to the same 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. See Actual Switch Box Wiring. Diagrams shown on this hookup 3 way switch are simplified for clarity.
The lower left screw is the common and gets the black wire from the load 3-cond. The upper left screw gets the black dating cafe singlereisen from the right box 4-cond.
It should also help in understanding the functions of each type of switch. Be sure to attach a bare copper wire to the green screw on the switch.
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