Two-Way Switch
A two-way switch is a special type of electrical switch. It is used to control one light (or fan) from two different places. This system is commonly used in staircases, long corridors, or big rooms — where a person may want to turn the light on or off from either side.
How it works:
- In this system, we use two SPDT (Single Pole Double Throw) switches.
- Each switch has three points: one common (C) and two terminals called L1 and L2.
- The L1 and L2 terminals of both switches are connected to each other by two wires (called traveler wires).
- The common terminal of the first switch is connected to the power supply (phase/live), and the common of the second switch is connected to the light.
- The other end of the light is connected to the neutral wire.
When you change the position of either switch, the circuit becomes complete or incomplete, which turns the light ON or OFF.
Switch Positions and Light Status:
- If both switches are in the same position, the light is ON.
- If the switches are in opposite positions, the light is OFF.
Example Use:
Suppose you turn the stair light ON from the ground floor. After reaching the first floor, you can turn it OFF from there. That’s the use of a two-way switch.
used in staircases, long corridors, or big rooms
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