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Which plugs Wire my house X-Ray Remote 304114 wall plate FAQs BLOG Contact Us		How to connect your UK BT telephone Master and Extension sockets are identical except that the Master socket has additional components: A gas-discharge voltage-surge suppressor. A 4k7 resistor to "loop the line". A 1u5F capacitor to pass ringing current but not d.c. Connect incoming line wires to terminals 2 and 5. A common cause of problems is dampness, which causes corrosion of the wall socket connections. You can cure or avoid this by making fresh connections and coating them with silicone grease. Click HERE for info. Wire extension socket to master socket by wiring terminals 2, 3 and 5 together. 2 and 5 should be a twisted pair since these carry the voice. 3 is used to disable ringing when the handset is lifted. Cable colour convention:- Blue with white tracer = 2 White with Blue tracer = 5 Orange with White tracer = 3 More info click HERE Fit socket so that plug clip fits on the right side. The sliding cover should slide upwards to open. Plug has a spring clip to keep it in the socket. The clip is designed to break if someone pulls- or trips over- the cable. A cord with plug can be fitted to the old fashioned "746" telephone as shown in the sketch. Not approved by British Telecom or other telecommunications companies