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Wiring Choice.

Zoomup

So there I was in the corner of a loft. I had two 1.0mm2 T&E cables to wire up for two new 240 Volt shower room ceiling lights that replaced some old 12 Volt faulty ones. The new ones covered the ceiling holes nicely. But, how to easily wire them in?

Ah, there is a convenient junction box that connects to the extractor fan, great I will just wire into that. It will have a permanent L which I don't need. It will have a N which I do need. And it will have a light switch controlled switch L which I do need. But wait, the grey and black are not sleeved or tagged with coloured tape. Is grey N or switched L? Is black N or switched L?

Well if it was installed by an old boy it is likely that black is N. But it may not be. If I wire up the lights reversed polarity they will still work but the install will not be compliant. I have no tester with me and the circuit is turned off while I am working on it. What did I do?

 

Z.

 

 

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    Answer. I had a gut feeling that the install was made initially by an old boy. So I connected up blue of the new cables to black of the fan wiring for N. I then connected up the new brown for the new lights to grey for switched L.

    After fighting my way down to the landing past the killer spiders in the loft, I went downstairs to the garage and reset the lighting M.C.B. Upon testing the now live lights in the shower room I was amazed that by chance I had chosen the correct combination of colours. The lights worked well via the pull cord switch………………well if the shower isolator switch was in the ON position. The convenient loft fan junction box was located post fan isolator switch not before it. Doh! Anyway after a bit of additional fiddling I get it all sorted. I do dislike lofts with the killer spiders, loft insulation, dust, limited light and tangles of wires.

    Anyway job done and customer paid.

    Z.

    P.S. Note to self. Do not connect loft lights to the upstairs lighting circuit.

     

     

Reply
  • 0

    Answer. I had a gut feeling that the install was made initially by an old boy. So I connected up blue of the new cables to black of the fan wiring for N. I then connected up the new brown for the new lights to grey for switched L.

    After fighting my way down to the landing past the killer spiders in the loft, I went downstairs to the garage and reset the lighting M.C.B. Upon testing the now live lights in the shower room I was amazed that by chance I had chosen the correct combination of colours. The lights worked well via the pull cord switch………………well if the shower isolator switch was in the ON position. The convenient loft fan junction box was located post fan isolator switch not before it. Doh! Anyway after a bit of additional fiddling I get it all sorted. I do dislike lofts with the killer spiders, loft insulation, dust, limited light and tangles of wires.

    Anyway job done and customer paid.

    Z.

    P.S. Note to self. Do not connect loft lights to the upstairs lighting circuit.

     

     

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