Ring Main Cable Colours
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This is called two core and earth cable.
Ring main cable colours. A single cable connected to the terminals indicates that it is an existing spur. Blue this is the neutral wire. The most common use for this type of cable is for circuits that provide power to sockets. The standard wiring colours in the uk are as of 2006 the same as elsewhere in europe and follow international standard iec 60446.
Brown for live blue for neutral and green yellow for earth. Two cables may indicate either that it is on a main ring circuit or that it is a spur with another spur connected to it. Wiring colours conductor colours. It is made up of two cores and an earth core which must be covered with the identifying green and yellow sleeve when installed.
An example of this cable type can be seen below and shows the live neutral and earth wires. You should also be looking at the condition of cables as well as the sheathing of the cables. Brown orange and yellow are used for 480 vac. If the wiring system has one phase at a higher voltage than the others using a high leg connection that phase s wires should be marked with orange.
Since 2006 british law dictates that the colours mentioned above must be used in all new electricity installations. Any electronic wiring in a uk home features three colours of wiring which are used for three different functions. The usa have their own wiring colours for electrical circuits black red and blue are used for 208 vac three phase. Cable used for a ring main or final ring circuit.
A branch supplying a side socket or outlet especially from a ring circuit. A ring main uses 2 5mm cable comprising of a live neutral and earth. This colour scheme had already been introduced for appliance flexes in the uk in the early 1970s however the original red black colour scheme recommended by the iee for fixed wiring was retained until 2006 albeit with change to a green yellow striped. The neutral black becomes blue.
If you have the previous colours red black and green earth or bare earth very dangerous we would recommend you have an electrician test to check the integrity of the cable as it could be more than 50 years old and unreliable. Australia also have a different wiring colour standard. This is required in nec article 110 15. Brown this is the live wire.
This colour coding is implemented in 2006 amendment 2 of 17th edition bs7671 to harmonise the uk europe wiring colours to maintain consistency avoid confusion. Brown live blue neutral earth remains the same. The live red becomes brown. It is important that the wiring is done in accordance with bs7671 wiring regulations.
Green and yellow bare earth. The uk s new cable colours for plugs are now harmonise with europe s power cable colours for ac dc. Green and yellow bare earth. This is the earth wire.
This figure shows old wiring colours new post 2004 colours are. The earth wires continue to be green and yellow.
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