TELEPHONE SOCKET WIRING - HOW TO DO IT House telephone wiring uses cable containing six 0 diameter solid conductors. It is important that this size of wire is used or a good electrical connection cannot be guaranteed and there could be problems in the future with the system. Never use stranded wire, mains cable or bell wire. UK Telephone Wiring Note that with the two rightmost 2 wire examples in the diagram going from RJ11 to BT will involve the colour code going "wrong" at one end or the other unless a junction box or joint is used. If the lead has a BT adapter at one end the colour swap is usually made there, USR tended to swap it in the RJ11 plug, others do their own thing. Doing your own telephone wiring - wire-your-phones Most phone wire installed in the U.S. during the second half of the 20th century is of the following kind: Four-strand wire: The kind of wire shown above has recently become obsolete. For all new telephone wiring projects, you should use Cat 5 cable. All of the Cat 5 wire I've seen uses the following color coding: DIY Home Telephone Wiring - Do It Make a small "hook" in the wire with the needle nose pliers and place the wire under the screw. Make sure the wire is wrapped around the screw in a clockwise direction so it will stay under the screw when you tighten it. Now that you have your phone jack wiring complete, you must now hook the telephone wire up to the connecting block. Wiring Information - Telephones UK The wiring diagram for a master LJU socket is shown here. Note that the pictorial view shown above only serves to indicate the two differing types of sockets and wiring connections. Contrary to how it might seem, C1 is connected to terminals 2 & 3, not 1 & 4. Telephone Wiring Diagram - Electrical Wiring How to Wire a Telephone: Checking Home Telephone Wiring Connections, Why a Telephone has No Dial Tone. Repairing Security System Telephone Wiring How to Identify and Splice Telephone System Cables – Telephone system wiring is considered low voltage however when a Telephone Wiring Colour Code - BT Telephone Extension This is how the Telephone Wiring Colour Code looks wired with the stripey telephone cable. Note that this is the latest type available with a Bell Circuit Filter (the cylindrical protrusion next to the terminals) Telephone Wiring Colour Code – What do the wires do? Telephone Extension Sockets have 6 connections labelled 1 to 6.