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Lacer75

4th wire confusion

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Lacer75

Hi,

 

Is anyone able to tell me what the forth wire on a light is please. I know live, neutral and earth but not sure where a 4th wire should be connected. So any help would be appreciated.

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Sharpend

Which light? 

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Lacer75

I can't seem to attach a photo unless you can tell me how then I'm happy to post it to help

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Rob.

Until you have posted 10 times, or a moderator approves you. Then you can't post photos. 

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Sharpend

Can’t quite make our colour, but I suspect that is an earth that carries down the fitting? What colour is the core? 

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Lacer75

Thanks for your help. It's a silver wire with a streak of green through it. If it is the earth through the light would I just wire that into the earth on the ceiling rose?

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Rob.

Yes, but I would want to prove it is an earth. Otherwise, it'll go bang.

 

Got any test equipment?

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Lacer75

I got an ac detector for behind walls but nothing else. Any way else I could test?

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Rob.

9V battery, a length of wire and a spare car headlamp.

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Evans Electric

I can make out a brown stripe  ..a blue stripe  and the Gn/yell ,  as Rob says , get a 9V  battery  & car lamp & complete the circuit down that extra wire and back from the body of the fitting  , which we'd assume was metal .     Can't think what else it could be but strange things happen .  

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ProDave

That fitting has TWO earth wires.  The silver one with a green thread goes down to earth the bit on the bottom of the pendant, and the short green / yellow earths the bit that is screwed to the ceiling.  BOTH must be connected to the earth of the cable feeding the light.

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