How do you hook up a 2 way light switch

Two way light switching

Notice the black wire is the only wire that we are controlling through the 2-way switch. You have an incoming hot wire black going to one screw it does not matter if you use the brass or silver screw on the side of the 2-way switch and a black wire from the other screw on the 2-way switch going to the load light, ceiling fan etc.. The white wires are wire nutted together so they can continue the circuit. Now as for the ground wire. It is very important to connect the ground wire to the switch as well. The Green screw on the 2-way switch is for the ground so all ground wires should be connected as seen below.

All ground wires bare copper are all now connected incoming ground, load ground and switch ground. This makes for a safe protected circuit by having all grounds intact. So what have we accomplished. By wiring a 2-way switch, The circuit below shows the basic concept of electricity flow to the load.

2 Way Switching

Let's assume the load you are controlling is a light. The electricity flows from the hot wire black through the 2-way switch shown in off position and then to the light and returns through the neutral wire white.

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This is a completed circuit. The condition of getting Output in ON condition is same as the Ex-nor gate truth table which is given below:.

2 Way Switching - DIYWiki

This is the new method to make a 2-way switching connection as it is slightly different from the two wire control method. This method is commonly used now days as it is efficient than the Two Wire control system. As you can see in the Schematic Diagram of 2 way switch circuit below , the common of both the switches are short-circuited. In 3-wire control method when switches are in same state the light will be in OFF state as shown in circuit below:. The condition of getting Output in ON condition is same as the Ex-or gate truth table which is given below:. It's a age old logic but still a mesmerizing thing to people who doesn't belong to this domain.

Thanks for explaining it so clearly. In the electrician's trade, the two switch location load control is termed a '3-way' system. The wiring schematic conforming to the adopted International Code Council requires a different physical configuration for safety compliance than what is demonstrated in this article.

Two way switch Connection

Thank you for this acticle. You solved a problem for me. Does anyone know how to do this with an led mech like the clipsal 30PBL?


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I'd like the mech led off when that switch is powering the light.