If you already have a telephone line you can install extensions, provided your line is connected to a master socket - a square white box with a shuttered socket aperture. A master socket can only be fitted by an authorized engineer from your telephone company. There must no more than 50m (54yd) of cable between the master socket and the furthest telephone extension. Make sure you have a socket converter: this plugs into the master socket and has a length of cable attached and as many extension sockets as you need plus enough cable cleats to fix the cable at 300mm (12in) intervals. You will also need an insertion tool. If you buy an approved telephone extension 'kit', this will normally be included.
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