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PostPosted: Thu Aug 10, 2017 11:44 am 
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Hello all. After a significant water leak from upstairs I took down 2 lights from downstairs ceilings. Both are two way. Having left everything to dry out for a couple of weeks, I decided to put the lights back up. The first one (in the kitchen) was no problem - up and working fine straightaway. The lounge light has been a real problem. The switched live was not marked and I forgot to note the connections when I removed the fitting. One of the switches on this one is a dimmer. I tried to identify the switched live by trial and error, using a lamp holder rather than putting the light fitting up. There was a pop from the dimmer switch when I switched on. I am assuming this was the switch burning out when I got the wires wrong. Is that likely to be right? Since then I have identified the switched live using a multimeter. What puzzles me though is that the hall and porch light will not work now, even if I remove the switch wires from the connection and simply pair up the two reds and two blacks that remain. I realise that I may well have to get a spark in to fix this but would really like to do the job myself if possible. Any ideas please? Have I got something fundamentally wrong?


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PostPosted: Sat Aug 12, 2017 7:17 am 
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If the dimmer went "pop" and the other lights no longer work, its a good chance that you have wired the light wrong.
You really need to find out which cable goes where / does what, for that you can follow the cables (probably not) or use a multi meter.

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No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

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PostPosted: Tue Aug 15, 2017 9:56 pm 
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Thanks. There were three cables at the light fitting. My layman's assumption was that one was from the previous light, one was to the next light (presumably the hall - as it packed up) and the other was the switch cable. If that is right, would it normally be the case that if the switch cable is removed, the circuit would be complete - by connecting the 2 reds together and the two blacks together - and the porch light should work normally? Spark in soon I think!


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PostPosted: Tue Aug 15, 2017 10:26 pm 
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That is actually a good assumption. :thumbleft: Most people get it wrong.
Your theory is correct, but you should never assume anything.

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Take it easy, a forum is only a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link. to find out more.

No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here


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PostPosted: Tue Aug 22, 2017 9:26 pm 
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someone-else wrote:
That is actually a good assumption. :thumbleft: Most people get it wrong.
Your theory is correct, but you should never assume anything.


I've solved the problem after going back to square one and checking the cables again. Now it's confession time! What I thought was the switch cable was actually one of the circuit cables. BUT there was some continuity between the red and the black in this cable, which is what sent me off on the wrong track in the first place. Is it possible to have continuity in a cable which is not the switch cable? Could this indicate a fault somewhere? Or could I simply have got a wrong reading on the multimeter by setting it incorrectly? All the lights are working normally now. I just have this nagging doubt about the safety of the circuit. Should I get a spark to check it?


Last edited by Strattonian on Tue Aug 22, 2017 9:59 pm, edited 1 time in total.

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PostPosted: Tue Aug 22, 2017 9:48 pm 
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You were either metering a lamp or your self.

When you find a switch cable the easiest thing to do is.............operate the switch

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Take it easy, a forum is only a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link. to find out more.

No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here



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PostPosted: Tue Aug 22, 2017 10:03 pm 
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OK, cheers. A few pennies have dropped during this exercise!


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