Warm 45A shower switch plate, and warm 20A Immersion Heater switch plate ( house been re-wired 5 years ago). I've changed both plates, like for like, and both still slightly warm. Cable feeding the shower is stranded so presume its 6mm or 10mm( how do i tell which one?).2.5 on I/H.
What to do next?
What to do next?