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PostPosted: Thu Sep 07, 2017 12:23 pm 
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I have a property occupied by tenants, one of whom has 'helpfully' tried to replace a broken lightswitch, but has messed up the swap. It's a two-gang switch (operating two separate ceiling fittings in a living room). One is working fine, but the other is a 2-way switch, and doesn't work (but is obviously dangerous, as one of the wires is loose in the back of the switchbox!).

I'm not confident that I can identify how the 2-way switch (on the left in the picture) should be wired. It is obvious from colours/sleeves? Can anyone assist me before I call an electrician?

Thanks in advance.

(PS I'm better at plumbing...)


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PostPosted: Thu Sep 07, 2017 12:44 pm 
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There is no hard and fast rule as to what colours are used to do what. But a guess would be take the black (with a brown sleeve) out from where it is and put it in the top single terminal of that half of the switch.

So it will look like the other switch does now. (One wire at the top, one wire at the bottom right. As we look at the picture)

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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: Thu Sep 07, 2017 12:48 pm 
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someone-else wrote:
There is no hard and fast rule as to what colours are used to do what. But a guess would be take the black (with a brown sleeve) out from where it is and put it in the top single terminal of that half of the switch.

So it will look like the other switch does now. (One wire at the top, one wire at the bottom right. As we look at the picture)


I'm expecting to connect three wires, though (how else can it function as two-way?) - and that leaves the blue wire (with brown sleeve) not connected to anything - surely that can't be right?


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PostPosted: Thu Sep 07, 2017 1:39 pm 
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:oops: Sorry it was the way I read your post.

If it is two way, there is no G'tee as to how it is wired, its a case of test / trial and error, BUT, go and look at the other switch that operates the non working light, that will have either 3 or five wires in it (Again, depending on how who ever wired it chose to do)
Look for the cable that has 3 wires and how ever that is done, do that at this 2 gang switch.
One wire is the common, the other two are strappers. So long as the common is right, it doesn't matter which way round the strappers go. Common is always the single "top" terminal

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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: Thu Sep 07, 2017 1:52 pm 
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This is the 2nd switch. I'd have to go and look at it more closely to see whether the five wires are identifiable as a 3-wire cable + 2 others.

Is it safe to experiment? From what (little) I can understand from a wiring diagram, all the wires present are potentially 'live' - does that mean that the worst that can happen is that with three wires connected the light will be either always on or never on - not that I will short the circuit or do damage?


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PostPosted: Thu Sep 07, 2017 2:54 pm 
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I would not recommend "experimenting" But the good news is the common is Grey (it can easily be seen on its own) so that means the two strappers must be black and brown.

So all you need to do is to go to the other switch, find the 3 that are in the same 3 core and earth, put the grey in the common, and the blue and black in their own terminals.

Obviously the lecy is off while you do this.

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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: Thu Sep 07, 2017 6:40 pm 
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StuartH wrote:
does that mean that the worst that can happen is that with three wires connected the light will be either always on or never on - not that I will short the circuit or do damage?


Correct. As S-e says Lecky off anyway whilst working on the switch.

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PostPosted: Thu Sep 07, 2017 9:49 pm 
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Move the grey wire as shown into the terminal shown by the pink line.

Put the blue wire into the terminal shown by the red wire.

Try it. If it does not work properly then swap over the two wires shown by the green line.



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