Bus Bar screw terminals - with these types of terminals, each cable core has its own location hole and screw for securing to a terminal.Single screw point terminal - as the name implies, each terminal has just one large screw which is used to secure all the cable cores being joined together.One thing to watch out for with the number of terminals, is the type of terminal used. Junction boxes have 3, 4, 5 or 6 terminals and the number required depends upon the application. The size used should equate to the current rating of the circuit being connected into - you can always use a higher rated box than the circuit but never a lower rated box.įor a lighting circuit use a 20amp junction box and for a ring main or radial circuit use a 30 amp junction box. Junction boxes are rated in amps (typically 5, 20 or 30 amp). Junction boxes can be found as either round or square boxes, round ones are more common, square ones tend to be used for higher current cables. They can also be used to make repairs where a section of cable needs to be replaced.
Junction boxes are used to connect cables to add socket, lighting points, extend circuits etc. From 1st January 2005, the Building Regulations Part P requires, in England and Wales, that only certified persons can carryout electrical installation work, or the work must be certified upon completion - see this page for more details.Īlways isolate any electrical circuit before working on the circuit. They are secured in place by tightening the TERMINAL SCREWS with a flat-head screwdriver.Please note that all electrical wiring and installation details given on is for information purposes only. Terminal: These connect the LIVE, EARTH and NEUTRAL wires to conductors in the FACE PLATE, which ultimately transfers the electricity to a plug. The LIVE and NEUTRAL connectors are 22mm apart with shutters to prevent the insertion of anything other than a plug.ĩ. Face Plate: Available in a range of materials and designs, the socket’s facia houses the TERMINALS and is screwed to the MOUNTING BOX. The live wire is currently brown in colour, although prior to regulations changes in 2004 (to aid the colour-blind) it was red, so if you are changing a FACE PLATE or adding a new socket in an older house, this is what you will find.Ĩ. This conductor is ‘switched’, so you can stop the flow of electricity. Live: Electricity flows along this wire from the consumer unit to the socket, as and when needed. This wiring must be updated by an electrician.ħ.
This is a 2.5mm2 ‘three-core circular sheathed cable’. Cable: A PVCu sheath encases the LIVE, EARTH and NEUTRAL wires. The CABLE should only just be able to fit through the hole, to prevent the spread of fire.Ħ. Soft Grommet: Available open or ‘blind’ (has no hole, so you can cut one to size) and usually of PVCu or rubber, this protects the CABLE from the MOUNTING BOX.
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