Hi !
I am trying to replace an old dimmer switch. When I took the old one off there was 3 sets of cables behind the plate. All the earth wires are wound together and attached to the interior wall plate. The black wires are all wound together and are not attached to anything. And the the 3 reds , two are wound together and one is single. they are connected to the back of the switch. The old switch was working but I,m wanting to renew it. Is it safe to connect as before ?