I want to change some switches & sockets. Currently a 45a 1 gang cooker switch is in a 1 gang back box, physically seperate from an adjacent 1 gang 20a switch (dishwasher) & a double socket, these last share a 2 gang back box (socket) & a linked (with a metal knockout joiner) 1 gang back box.
I was going to replace these with a 2 gang box for the socket, & a dual back box for the 2 single gang switches (cooker & dishwasher) but a thought/question occurred....
Are these circuits (1 cooker, & 2 the others) supposed to have separate earths as now?
If I were to use a dual box I'd in effect be linking their earths....
TIA