Power for the spur may be supplied from another socket outlet on the ring provided it does not already have a spur from it and it is not a spur itself. Check with the I.E.E regulations to ensure compliance.
2. Switch off the power at the consumer unit for the circuit concerned. If you have removable fuses at your consumer unit, switch off the power at the consumer unit and remove the fuse for this circuit.
3. Inspect the wiring at the socket. You must make quite sure that this circuit is indeed a ring main. If you are not absolutely certain, consult a professional electrician.
- If it has one cable, it is itself likely to be a spur and cannot therefore be used.
- If it has two cables it may be a suitable socket on the ring, assuming that somebody has not incorrectly connected a spur from another spur.
- If it has three cables, it indicates that it is already feeding a spur and may not be used.
Adding the new cable
Connect up the new socket
7. Having fed the cable into the socket box at the new position, strip the cable ends ready for connection. See our Cable Stripping Guide for detailed information on this.
Connecting the cable to the new socket outlet
14. Ensure that the conductor is fully housed and that there is no exposed wire showing. Fasten the screw and make sure the wire is firmly secured.
Metal Boxes Only
17. An earth tail must be fitted between a socket outlet and metal back box where both socket fixing lugs are adjustable. If this is what you have, cut a suitable length of the earth conductor from some cable of the same size as that used for the circuit. Sleeve this with green and yellow sleeving allowing ½” conductor to be exposed at either end.
Fixing the socket outlet
20. Double check that all your connections are to the correct terminals, and securely fastened.
22. Fasten the face plate with its retaining screws. Tighten the screws alternately to draw the plate back evenly.
Preparing the Existing Socket
24. Slacken the fixing screws and remove the face plate of the socket to which you are going to connect.
26. If not, remove one of the other blanking plates in the box to provide entry for the new cable. If it’s a metal box, fit a rubber grommet to the new entry hole and feed the cable in.
Connecting the spur cable at the original outlet
28. Slacken the screws on the connection terminals and insert the conductors of the new spur cable into the corresponding terminals alongside the existing ring main conductors.
31. Repeat the process with the three green and yellow sleeved conductors connecting them to the terminal marked earth (earth symbol). If you have a metal mounting box and there was an earth tail connecting between the socket and the earth terminal on the back of the metal mounting box, this should also be connected.
32. Ensure that the conductors are firmly held and that the insulated part of each butts right up to the terminal.
Re fixing the socket outlet
33. Double check your connections and ease the face plate back to the box folding the cables carefully as you do so.
36. Once you are sure that all work has been completed correctly, switch the power back on at the consumer unit. In the case of removable fuses, replace the fuse for the circuit, and switch the power back on.
37. Check your new socket to ensure that it is working properly.