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Cable A and Cable B are the live, neutral and earth loop to each of the lights in the circuit, (Cable A feeds in the live supply from the previous light in the circuit and cable B loops out to supply the next light in the circuit) these cables remain ‘live’ even if the light switch is off, this is why you should ALWAYS make sure the circuit is isolated before you start work. If the number of red & Black wires doesn’t quite tally-up with that shown above, one of the following will be the case. Fig 3 – shows the last ceiling rose on a circuit and therefore there is only two cables present, cable A is the live, neutral and earth supply, cable C is the twin Red and Earth to the switch. If the cables in your ceiling rose are Brown and Blue and not Red and Black as shown above then see the alternative wiring diagrams.
Regardless of which configuration you have, the rule for wiring the new double light fixture is the same.
Connect the 2 black leads from the new fixture the same way that the single black lead from the old fixture was connected. If the old fixture did NOT have a ground lead, then connect your new fixture's ground lead (green or bare copper) to the existing ground wires coming into the junction box AND to the existing metal mounting bracket that will hold the fixture. If there are no ground wires coming into the box as part of the house's wiring (shown as bare copper wires in the diagrams), then just connect to the bracket or box grounding screw.
This site answers questions related to home electrical wiring, home wiring, general electrical help,and other electrical questions related to aleternating current (AC). ExpertiseI can answer any questions about residential electrical wiring and most questions about commercial wiring.

Twin and earth wiring is required for all installations except those using a double wall control. However, If in doubt with any part of the installation procedure then please contact a qualified electrician. 1 here the electrician has used twin and earth for cable C (Red and Black) instead of twin Red and Earth as the switch wire, the Black conductor should really be sheathed with Red sleeving to show it is a live conductor, if it is not, before attempting to replace the ceiling rose you should mark this conductor with either Red sleeving or insulating tape to avoid problems when reconnecting the ceiling rose.
Until you have tested each wire AFTER turning off the circuit at the panel box, assume each wire might be Hot (this is what a pro does) -- you might have chosen the wrong circuit breaker or fuse, or, even worse, there may be some hidden mis-wiring that connects one or more wires there to a different circuit. Please read the article on safe isolation procedures before doing any electrical work.
The easiest way to tell is simply to count the number of connections to the Black and White leads coming from the existing light fixture (where the arrows are pointing). Counting those leads, there should be 3 Black wires connected together and 3 White wires connected together if you have Configuration #1.
Building regulations are changing all the time and modifying your home electrics could be against new rules and could invalidate your home insurance, if in doubt check first! These are only schematic diagrams to explain about the different kinds of arrangements that you may find when changing a light fitting.
The earth wires have been omitted for clarity and would need to be connected at all switches and ceiling roses.
You can see that there is a Live and a neutral that has come from either the consumer unit or from another light fitting.

Then a live and neutral that goes to the next light fitting, which will probably be in the next room. Then a wire goes from the live terminal and to the switch, A wire then goes from the switch to the switched live terminal on the ceiling rose.
The switched live wire may be completely red, have a piece of red sleeving over it or may be wrapped with red tape, or non of the above.
The Lamp is wired so that the neutral black wire is connected to the neutral terminal and the live red wire is connected to the switched live terminal.To complicate matters further someone may have decided to add another light, perhaps wall lights somewhere and has taken a feed from your ceiling rose. Now the ceiling rose would start to look really busy and would have an extra live and neutral (+earth).You may find that there are only a few wires in your ceiling rose.
If this is the case then it is either the last light on a loop in circuit or the connections could of been made in a junction box and then a single cable has been run to the ceiling rose or the lights could of been wired with the neutral wire in the switch (instead of being in the ceiling rose)This is an alternative way of wiring a lighting circuit. Instead of taking the feed wire from the consumer unit to the ceiling rose it is taken to the switch. The permanent live wire is wired into the switch and the switched live into the switched live terminal.

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03.08.2014 admin

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