Looking at a nearly completed extension the other day, I noticed that
there were two separate cables awaiting connection in each light switch
patress, one being a live feed and the other going to the light
fitting.
I know how lighting is wired in the style where one cable carries a
live feed through the switch back to the junction box then to the lamp,
but how is this style wired up?
Thinking about it, there seems to be one connection point short using a
conventional light switch.