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Changing fluorescent to ceiling rose - light stays on

Discussion in 'Electrics UK' started by Shockingnovice123, 11 May 2014.

  1. Shockingnovice123

    Shockingnovice123

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    Dear all - I'm new to this so please stay with me. I had hoped that I could simply replace a fluorescent light with a standard ceiling rose by switching the l,n and e wires on a like for like basis. When I did this however I turned the power back on at the mains and the light came on without the light switch being on. I opened up the light switch (the only one to control the only kitchen light) and there were two wires in Com and one in L1 (nothing in L2). There are three cable bundles feeding the switch. All the neutrals are tied together as are all the earths. I presume one cable is from the mains, one goes to the ceiling light, but I'm not sure where the other goes.

    Can anyone solve the puzzle?

    Thanks
     
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  3. plugwash

    plugwash

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    What cables do you have at the light?
     
  4. Johnmelad

    Johnmelad

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    Pictures please.
     
  5. securespark

    securespark

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    ;)

    One of those "neutrals" is a switched live, which will go live when you switch the kitchen light switch on. Then you will have a dead short L to N and it will blow the fuse or trip the CB...

    EDIT:

    Re-read your post. This is not the case as you have all connections at the switch, not the ceiling, is that right?
     
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  7. securespark

    securespark

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    The other live on the Common will be the loop to the next light on the circuit.

    Is your switch kaput?

    Try switching off power, disconnecting the single wire from L1 and placing it in a terminal block for safety, then reinstating the supply.

    Does the light still come on?

    You haven't altered the switch wire connections around, have you?
     
  8. Shockingnovice123

    Shockingnovice123

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    Many thanks for the quick responses. There is one grey cable at the light that has brown, blue and green lines. At the switch there are three bundled cables of the same make up. The earths are all earthed, the neutrals are blocked together and the brown lives go into the switch - 2 in coms, one in L1.

    I haven't changed the switch wiring and the switch should work as it worked with a previous light.

    I have taken L1 out (so there are just two wires in com) and the light didnt light up. Which I guess does imply a switch failure of some sort with it being stuck on.
     
  9. Shockingnovice123

    Shockingnovice123

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  10. securespark

    securespark

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    In that case it's worth trying another switch.

    Does the old one feel slack or gratey or different?

    If you have others the same, try them to see if they have the same action to them.
     
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