The two wires must be prepared before connection see Preparing the cable for connection. Once prepared the conductors must be joined together - Red to Red, Black to Black and the bare wire to the bare wire. If a loop of cable is at the socket then it can be cut in half to make two cables which must then be prepared and joined as stated above. Alternatively it would be preferable to cut into the insulation without actually breaking the loop and expose the conductors which can then be folded over and twisted together see diagram (*).
The socket should have three screw terminals marked L (Live), N (Neutral) and E or (Earth). The red conductor/s should be fixed in the Live terminal (L), the black should be fixed in the Neutral (N) terminal and the bare wire/s covered with the green/yellow sleeving should be fitted into the Earth terminal (E or ) and all tightened securely.
The socket is now ready to be screwed into position.