Replacing a switch or socket may seem straightforward, but an incorrect connection can lead to a short circuit or a fire. Before carrying out any work, the power to the relevant circuit must be switched off at the fuse box and checked with a tester.
Work on the fuse box, new wiring or earthing must be carried out by a qualified electrician. In this case, the savings from a „do-it-yourself“ approach are rarely worth the risk to the home and the people living there.