How to connect a 2-way switch

In this tutorial, we will show you how to make 2-way switching connection. A 2-way switching connection means you can control an electrical equipment like bulb by two switches placed at different places, generally used in the staircase. Two way switch can be operated from any of the switch independently, means whatever be the position of other switch(ON/OFF), you can control the light with other switch.

There are two methods of making 2-way switching connection one is 2-wire control and another is 3-wire control. We have explained both the methods below and both the methods are demonstrated in the Video given at the end of this article.

 

Required Components

  • Two 2-way switches
  • Bulb
  • AC supply
  • Connecting wires

 

How to Connect 2-way Switch Wiring  using Two wire control

2 way switching by 2 wire method

This is the first method to make a 2-way switching connection, this is the old method. If you are going to install a new one then go for three wire control method.

 

As you see in the Schematic Diagram of 2 way switch circuit below, you will find that the phase/live is connected with the common of the first 2-way switch. PIN1 & PIN2 of the first switch is connected with the PIN1 & PIN2 of second switch respectively. One end of the bulb is connected with the Common Terminal of second switch and other end of the Bulb is connected with Neutral line of AC power supply.

Note: In 2-wire control method when switches are in opposite state the light will be inn OFF state as shown in circuit below:

2 way switching by 2 wire method

 

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

Switch 1

Switch 2

Lamp state

0

0

1

0

1

0

1

0

0

1

1

1

Where, 0 represents the OFF condition and 1 represents the ON condition.

 

How to Connect 2-way Switch Wiring using Three wire control

2-way-switching-by-3-wire-method

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. PIN1 of both the switches are connected with the phase or live wire and PIN2 of both the switches are connected with the one end of the lamp. The other end of the Lamp is connected with Neutral line of AC power supply.

Note: In 3-wire control method when switches are in same state the light will be in OFF state as shown in circuit below:

2-way light switch circuit diagram using 3-wire method

The condition of getting Output in ON condition is same as the Ex-or gate truth table which is given below:

Switch 1

Switch 2

Lamp state

0

0

0

0

1

1

1

0

1

1

1

0

Where, 0 represents the OFF condition and 1 represents the ON condition.

 

Applications of Two way Switching:

  • Mostly in stair case.
  • Erroneous tripping of safety/circuit protection equipment.
  • A big room having two entry/exit gate.
  • To control any AC appliances like fan or light from two places like entry and exit.

 

Video: 

Comments (3)

  • Abhrodeep Chanda's picture
    Abhrodeep Chanda

    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.

    Nov 23, 2017
  • RBenton Jacks's picture
    RBenton Jacks

    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.

    Nov 28, 2017
  • anees yarana's picture
    anees yarana

    Thankyou so much.
    .I like it

    Dec 03, 2017

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