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Answer for UK and European electrical system.
Guide to connecting a new socket outlet to the power cables of a ring main, and fixing it to the back box or pattress in the wall. Depending upon where in the circuit you are fitting the socket you may have one, two or three sets of conductors. This article assumes that the socket outlet is being connected as part of a standard ring main and there is no spur. You will, therefore have two cables at the socket outlet. If you are not sure whether this is what you have, consult a professional electrician for advice. 1. 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. 2. Strip both the cables ready for connection. Cut through the end of the outer sheath of the cable carefully using a pair of side cutters. Be sure not to cut into the insulation of the conductors. 3. Peel back the sheath to reveal the conductors and grip the end of the bare earth conductor with a pair of pliers. Draw the wire back through the sheath like a cheese wire. 4. Fold the excess back and trim with the side cutters. 5. Separate the conductors and trim the insulation of each back by about 1/2" with wire strippers. More on this can be found in our Cable Stripping Guide. 6. Insulate the earth conductors using the separately sold green and yellow sleeving. This should be cut to length and fed over the conductor so that about 1/2" is left exposed at the end to match the other conductors. 7. Slacken the screw of the appropriate connection terminal. If you are fitting more than one conductor to a terminal, insert them alongside each other. Do not twist conductors together before inserting them into the connection as this may damage them and can also cause problems when testing circuits. 8. Insert the brown (old cable colour = red), live conductors into the hole in the terminal marked 'L'. 9. 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. 10. Repeat the process for the blue (old cable colour = black), neutral conductors, fixing them in the terminal marked 'N'. 11. Repeat the process for the green/yellow, earth conductors fixing them to the terminal marked with the earth symbol.
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