Hi all. I have a problem with a dimmer light switch plate. when its touched there ia "buzzing" sound and a faint tingle.
uk 240vac supply tn-c-s (pme) earth system
I have measured from the metal face plate to earth and i get a reading of80-100vac. The earth wire from the cable is conected to the metal back box and the face plate, the switch feeds a transformer for low voltage lighting.
what could be causing it? a broken earth somewhere maybe?
thanks in advance Ben