Hi....putting new flooring down in the extension downstairs and noticed that the socket is fed from another socket on the other side of the room but the cable feeding it is going under the raised concrete floor which used to be a garage ....not sure if it is in conduit or just buried.....last home owner said the house had been rewired a couple of years before I bought it and new fuse box with breakers in and survey did confirm this but my query is ...is this normal to do this and is it safe and can be left, also the socket it is feeding is hardly used so I can disconnect