Loop lighting problems!!

Discussion in 'Electrics UK' started by lima449, 25 Nov 2005.

  1. lima449

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    Hi, I'm new to this site and am in need of some help!! I installed 2 new celing lights in the upstairs of my house today and when i turned the first one on it worked fine. The second one didn't work at all and when i flicked the switch it knocked all the other upstairs lights off. The wall switch then wouldn't flick on and off properly and seemed damaged. The MCB in the circuit breaker hadn't tripped also. I think i mixed up the live switch wire and one of the 3 neutral wires from the ceiling rose on the 2nd light connecting a neutral to the switch and the live switch wire to the other neutrals. I have the light disconnected now, but when i've replaced the MCB the other lights upstairs are still not working!! Do all lights in a loop system need to be connected for the upstairs lights to work??? Also, will i need a new wall switch etc for the 2nd light? Please help.
     
  2. Gary0

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    Lighting isn't normally connected in a loop so I'm a little put out by that. Also one doesn't normally have 3 neutrals and a live at the ceiling rose.

    Have a look at the diagrams in the sticky thread at the top. If the upstairs lights are not working then you have a break in the mains supply circuit somewhere. Need to track it down.

    I think what I'd do is to try connecting the light nearest the CU only first, see if I could get that working. If that's succesful, then move on to the next in line.
     
  3. BJS_Spark

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    Lighting is normally connected in a loop and is called 'Loop in' wiring. It is not a ring as it starts at the CU and ends at the last light in the circuit.
     
  4. slippyr4

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    oops.

    in what way did it seem damaged? smoke & flames?

    what rating is it

    There are not 3 neutrals (ignoring for a moment the drop leads to the bulb holder). There maybe 3 black wires- two of these are neutral and one is part of the switch cable. If you connected that to neutral, and the red from the switch cable to live, then you had a dead short when you turned the switch on.

    Maybe you've melted/destroyed something.

    Not all, no. The loop-in system is actually quite like a radial- where the feed comes in and out of each light fitting before going on to the next. If you've disconnected *everything* in the rose in question, then only lights *before* that in the loop will work. Which could be none, if it's the first light on the loop/.


    You're going to need to inspect and test each componant of the installation. For this you will need, at the very least, a multimeter.
     

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