These are typically labelled com l1 and l2 some may label the l1 and l2 positions as 1 way and 2 way. There are other ways of wiring a two way lighting circuit but this is by far the most common and easiest method.
Fg 3630 Wiring Diagram Of Two Way Light Switch
Two way switch wiring diagram uk. Below is the way i like to do it. 2 way switching two wire control. The old wiring colours that are present in the majority of homes in the uk have been used for this diagram. There are several ways to wire two way switching. This diagram represents a two way switching arrangement. A two way switchuk schematic diagram of old wire colours.
Old multi point radial lighting diagram using junction boxes. In one switch position the com terminal is connected to l1. It is essentially the same circuit diagram as the one on the top of this page but with the utilisation of modern cable arrangements. Schematic diagram of new wire colours. This circuit diagram describes the wiring a two way switch in such an arrangement so that the flat twinearth and 3 coreearth cables are not broken or interrupted anywhere between the components of the circuit. 3 way light switching new cable colours 3 way light switch old cable colours.
The schematic is nice and simple to visualise the principal of how a two way switch works but is little help when it coms to actually wiring this up in real life. A two way light switch is a simple single pole changeover switch with three terminals. 2 way switch wiring diagram two way switch two way switching. The way i show allows you to fairly easily add a second two way switch to an existing light switch by simply wiring them together in a certain way. 2 way light switch 3 wire system new harmonised cable colours 2 way switch 3 wire system old cable colours 2 way switch two wire control three way switching.