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Speaking from ship systems - a 220V supply (or any other voltage supply for that matter) on the ship is floating. There is no tie to ground so the potential difference between any one wire of the supply is only 110V to ground. Shocks are allways limited to a mild tingle unless of a serious...

Hello all; I've got a house at the mo that im doing up and i want to mount the sockets and switches in the walls... No problem for the sockets - just chip the walls out and fit metal boxes in the walls and fit nice new brushed metal sockets - beautiful! However - the lighting is pre 1966...