TELEPHONE SOCKET WIRING This page describes how to wire and cable telephone sockets in the UK only. As with all electrical work, if you are not trained or experienced in such matters, then the advice is to seek the expertise of a professional. Sockets can only be installed on the new plug and socket system.. Wiring for UK Telephone Sockets Author - Peter Parry - WPP Although pin 4 has no function in a domestic installation it is usually connected for the sake of neatness. The quality of wiring carried out by many older BT wiremen is often approaching art in its perfection. The BT Drop Cable (The cable coming from the outside world) This often has Orange, White, Green and Black wires. Usually (but.
Understanding Wiring Diagrams Before you can install the BT master socket, you'll need to understand the wiring diagrams. These diagrams show you the various connections and their associated pins, switches, and other components. They'll also provide you with information about the color coding, which will help you identify the specific.. Wiring Diagram for Master & Extension Telephone Sockets. When 'new-style' wiring was introduced in the early eighties a domestic single line telephone installation would have a master socket which is provided by the service provider (B.T., cable company etc.). This was usually an LJU2/1A or a LJU3/1A type of socket.