This is one of the easiest ways to increase the number of socket outlets in your home. No extra wiring is required and little or no redecoration afterwards. Just swap the single mounting box for a double box of the same depth, and connect the new double socket to the existing circuit cable.
Step 1
Before starting work, turn off the electricity using the main switch on the consumer unit - check that the power is off with a proprietary plug-in socket tester.
Step 2
Remove the two securing screws and pull the old faceplate away from its mounting box. Loosen the terminals securing the wires and remove the faceplate.
Check that the bare earth wires are covered with green/yellow earth sleeving - if not, cut a piece of sleeving to length and thread it over the wires, leaving about 12mm (1/2in) of each wire exposed.
Step 3
Remove the old mounting box. Break the plastic web covering the appropriate 'entry hole' for the cable in the new box. Pass the cable through the hole and screw the box to the wall.
Use a spirit level to get your mounting boxes horizontal. Slotted holes allow you to adjust the position of each box as you drive the fixing screws into the wall.
You may be able to use the existing screws and wall plugs. If not, drill new fixing holes in the wall and insert wall plugs.
Step 4
Connect the existing wires to the terminals in the new socket - red to the L-terminal, black to N-terminal and green/yellow to E-terminal. Make sure all the wires are held securely and that no bare wire is exposed.
When two or more identical wires are connected to a single terminal, they should be twisted together with pliers to ensure a good connection.
Step 5
Push the socket faceplate into the box, taking care not to trap the wires, then tighten the faceplate screws.
Step 6
When all is secure, turn the electricity on and test the socket by plugging in a lamp or a plug-in socket tester.
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