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Discuss Outside light fed from 2 circuits in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. happyhippydad
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    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    I went to a small job today to change a sensor for an outside light. I expected it to be straight forward.

    I started by isolating the supply, which ended up taking longer than expected as it needed 2 circuit breakers to be off in order to isolate it.

    I explained that i would need to remedy this first before changing the sensor but the customer didn't want to pay for the extra work so that was the end of the job.

    My question is, how does an outside light or indeed anything get fed from 2 circuits in the first place? It must be working from one circuit so why does someone feel the need to add it to another circuit as well? How could this fault occur?
     
  2. westward10
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    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Top Poster Of Month

    Location:
    Northamptonshire
    Could be part of the emergency lighting, it is not uncommon to see maintained fittings with separate switch and charge supplies. This charge supply can also be linked through the general non emergency fittings. They should ideally be on the same circuit but sometimes simple lighting circuits blow people's minds.
     
    • Informative Informative x 1
  3. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I would be recommending that the lighting circuits be investigated properly ....................

    Of is it a case of the SL and PL coming from different points?

    Some customers can be stupid ..............
     
  4. happyhippydad
    Online

    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    This was fed from 2 different socket circuits, domestic house.
    I just can't see in what scenario this happens! :confused:
     
  5. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Hum ......... what about the socket circuits - were they "dual fed" too?

    I found a 2G socket on a lighting circuit yesterday ..............in an outhouse!
     
  6. happyhippydad
    Online

    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    Just had an unexpected email from the chap saying he'd like an electrical report done on the house! I guess he had a think about it.

    The last report was 2000, so I suggested it was time for another.

    I shall update according in a month or 2 on the dodgy socket circuits!
     
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  7. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I normally sew the seed of investigation with customers then leave them to ponder .................. the hard sell isn't my tactic, nor does you any favours with your clients....
     
    • Agree Agree x 1
  8. KEV 1 N
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    KEV 1 N Regular EF Member

    Location:
    Durham
    There’s two circuits interconnected somewhere, if it’s sockets it could be the upstairs and downstairs legs of the ring mixed up at DB, unless the two ring circuits are on separate RCDs.
    If there’s just one RCD, then the interconnection won’t cause it to trip, the problem only comes to light(pun intended!) when you want to isolate an individual circuit, and end up having to have two MCBs switched off.
    Lighting circuits could be interconnected at the switch at the bottom of stairs where one controls the up light and the other for down.
     
    • Optimistic Optimistic x 1
  9. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Now where is that bottle of Scotch Someone gave me at ELEX today? thanks mate a good pain killer.
     
  10. westward10
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    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Top Poster Of Month

    Location:
    Northamptonshire
    Ah I assumed commercial, sounds like a wiring mess as there is no reason for it.
     
  11. Dave OCD
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    Dave OCD Forum Mentor

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    HHD - This will almost certainly be the two RFCs wrongly connected at the DB, one leg from each ring in both MCBs, it's dodgy but seems to happen quite often.
     
    • Agree Agree x 3
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  12. Wilko
    Online

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Glad to hear you didn't get a belt off it HHD !
    Being a competent and diligent person it's understandable you are trying to make sense of this circuit, but I think it's a waste of valuable drinking time :) . Edit - sorry didn't mean to sound offhand - fix first, then drink.
     
    • Like Like x 1
  13. Baddegg
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    Baddegg Still simmering Ken, not boiled yet buddy x Electrician's Arms

    Location:
    Portsmouth
    Smoking time.....he’s a hippy:D
     
  14. SJD
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    SJD Forum Mentor

    Location:
    Braccan heal
    I recently came across an outside PIR light fed from 2 different circuits. The previous owner had helpfully put a note in the fuse box to isolate the two circuits before working on one specific light.

    The reason - the light with PIR was to come on either when the PIR operated (from socket circuit via FCU) or when the other outside lights were turned on (switched live from lighting circuit).

    What the previous owner had failed to appreciate was the case when the PIR operated and the outside lights were turned on, when the two circuits were cross connected. I.e. beware of working on the socket circuit on a dark evening!
     
    • Like Like x 2
  15. happyhippydad
    Online

    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    Cheers Dave that makes perfect sense. A simple fix too!
     
    • Like Like x 1
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