Here are some helpful diagrams that show how lighting operating on a one way switch can be changed relatively easily for two way switch operation. Turn off the consumer unit and remove the appropriate circuit fuse / miniature circuit breaker first before working on any electrical circuit, once the cable is installed make the connections to the two way switches as shown. Fig 1 and fig 2 show the original switch connected with original (old colours, twin Red and earth) switch-wires and the additional two way switch linked with cable in the new colours, which in the case of three core and … [Read more...]