on video Two Way Switch Connection| Control A Lamp With Two Switch

Two Way Switch Connection| Control A Lamp With Two Switch

2-Way & 3-Way Switching Connections – Electrical Wiring Diagrams

What is Two Way & Three-Way Switching Circuits?

Two-way switching or (three-way circuits in the US) connection is used to control electrical appliances and equipment like fan, lighting points etc. from different places using 2-way & 3-way switches. The most common use of 2-way switching connection is staircase wiring where a light point can be controlled from two, three or even many locations. No matter what is the position of flowing electric current in the two way switch (ON or OFF), the connected appliance like bulb can be switched ON / OFF by pressing the button.

Construction & Working of a 2-Way & 3-Way Switch

In North America, the 2-Way switch is also known as Single Pole Single Through (SPST) while 3-Way switch is known as Single Pole, Double Throw. The basic construction and working principle of 2-way switch is illustrated in (fig 1) below.

How To Wire Switches in Series?

How To Wire Switches in Parallel?

For this kind of wiring installation, you will have the following requirements.

1 No of 4-Way Switch (Intermediate as 3-Way in IEC)

2 Nos of 3-Way Switches (Two-Way Switches in the NEC)

1 No of Light Bulb

Wires and cables as needed.

How to Wire a 2-Way Switch (3-Way – US)?

Below is a given schematic wiring diagram that shows how to wire a 2-way (or Three-Way – US) switch and control a light bulb from two different places.

The same purpose can be achieved by using the following two way switching connection in fig 3 as well.

Connect the Earth Wire to the connected electrical appliance as well as switches (always on Hot (Line or Phase) as per electrical regulation in your area.

The following two way switching connection can be used for the same purpose as mentioned above in fig 1 i.e. to control a light point from two different places by using 2-way switches

The following wiring shows to control a light bulb from two different locations using SPDT switches (also know as 3-Way switch in NEC and 2-Way switch in IEC.)

Additionally, you may use two 3-way combo devices (3-Way switch & outlet) to control a light bulb from two places (NEC – US) as follows where (both outlets are always on.)

Two Way Switching to Control Light from Two Places in Staircase

As we discussed above, that the most common use of 2-way switches is to control a light point from different places like upper and downstairs i.e. lower entering door and upper door.