2 way switching means having two or more switches in different locations to control one lampthey are wired so that operation of either switch will control the light. There are other ways of wiring a two way lighting circuit but this is by far the most common and easiest method.

Multiway Switching Wikipedia
Two way lighting circuit diagram. The old wiring colours that are present in the majority of homes in the uk have been used for this diagram. Switches are shown as dotted rectangles. This diagram represents a two way switching arrangement. Two way switching is the most common requirement for many household and commercial lighting solutions. When you are looking to wire a two way switch there are easy ways to do it and complicated ways to do it. This topic explains 2 way light switch wiring diagram and how to wire 2 way electrical circuit with multiple light and outlet.
Earth wires are not shown. These diagrams show various methods of one two and multiple way switching. Basic multi point radial lighting circuit. The most basic circuit with only two wires at the switch. 2 way light switch 3 wire system new harmonised cable colours 2 way switch 3 wire system old cable colours. This arrangement is often found in stairways with one switch upstairs and one switch downstairs or in long hallways with a switch at either end.
Whether it is the switching of a light from two different places inside a domestic dwelling or switching a series of lights in a commercial environment two way lighting circuits provide a cost effective and easy solution. A two way switch is one of the most basic parts of house wiring. L and n indicate the supply. Multi point radial lighting circuit new cable colours multi point radial lighting circuit old cable colours old multi point radial lighting diagram using junction boxes. Two way switching 2 wires.