I've got a light switch which is wired in 1.5mm T & E, but having traced the cables to the point them come down from the ceiling, the light switch appears to have been moved across the the wall by around 300mm and there is no earth in the original set of cables. The original cables are singles in pvc conduit.
How can I confirm the earth in the switch is actually connected to something?
How can I confirm the earth in the switch is actually connected to something?