Telephone extension cable

Adding additional sockets

Adding telephone sockets is very easy so that you can use a phone in almost any room. You can buy the individual parts you need for the work or kits which will contain the relevant parts (i.e. cable with adapter converter, wall sockets and cable clips etc.) are available. NOTE that sockets for extensions need to be ‘slave’ sockets rather than ‘master’ sockets.

It is important that telephone extension sockets and cabling are added in such a way that they do not affect the public telephone network. The telephone service provider is entitled to check and test any socket and wiring connected to the exchange lines.

Each telephone exchange line coming into a home or office should be fitted with a special ‘master socket’ which must be installed by telephone service provider – some older houses may still have the telephone ‘hard-wired’ – if you don’t have a ‘plug-in’ telephone, you will need to get your telephone service provider to install one before you can start adding telephone sockets yourself. It is Illegal to tamper with the master socket and you cannot install one yourself or wire directly to it.

Planning the installation

There are two possible basic circuits for installing additional telephone sockets:

Telephone extension circuit

  • Spur wiring – where the adapter connected to the master socket goes to a junction box and then each sock