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Two Way Switching Working Principle


In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.It is also called as a Staircase Switch, as you can control a single load, a light bulb for example, from two different places, like either ends of a staircase.

source/image(PrtSc): The Engineering Mindset

How to wire 2 way light switch, in this video we explain how two way switching works to connect a light fitting which is controlled with two light switches. We look at the EU colour coding wires and explain the different ways to connect the lighting circuit.

A Two Way light switch is a simple single pole “changeover” switch with three terminals. These are typically labelled COM, L1, and L2 (Some may label the L1 and L2 positions as “1 Way” and “2 Way”).In one switch position the COM terminal is connected to L1. In the other switch position it changes over so that COM is connected to L2. The design is a “break before make” type, such that the connection to the first terminal is disconnected before the connection to the new one is made.


A typical application is that of being able to switch the hall and landing lights on and off from both upstairs and downstairs. An implementation that allows both lights to be controlled from both locations could look like this:Disclaimer: This is just a theory explaining how a typical 2 Way Switch wiring works. It is not an user guide on how to install or wire a 2-way switch, working with electricity can be dangerous.

VIA The Engineering Mindset
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