Calling Lectrician and Unphased. You gave me advice last November re a dedicated commando socket and I've at last started the job. I've laid 4mm 3-core armoured cable to a depth of 18 inches, with hazard tape above, for a distance of 10m to the socket fixed to a metal post set in concrete. In the garage I intend connecting to a double pole switch, then via a junction box to the garage supply which is connected from the house via a 30mA RCD and has its own earthing rod. Am I ok so far? I have been told that apart from normal earthing I may need to earth the wire armour. Is this necessary at the socket end and the garage end? At the garage end do I earth at the switch or somewhere else? As to the method, can I use clips around the cable or is there a better method? Thanks for your patience.