Exterior Lights in the Drive + PIR as Switch

Discussion in 'Electrics UK' started by karlitob1983, 15 Sep 2021.

  1. karlitob1983

    karlitob1983

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    Hi all,

    Question: Can I use an PIR sensor as the only switch for exterior lights in my front drive.

    Background: I'm about to start groundworks on both the patio and the drive in the next few weeks. When I win the lotto, I'll be putting a garden room at the end of the garden - which is about 60m away from the consumer unit. So I'll be laying 3x16 swa and cat6a F/FTP now for whenever I need it in future. I will be feeding both wires in through the exterior wall at the side of the house; and along the floor of a room (a converted garage), and then through an internal wall to where the consumer unit is.
    As I don't need this for a few years, I wont be connecting either end to anything.

    But i was thinking that if am laying swa to the back garden, could I lay some swa to the front garden also for garden lights. Our perimeter is about 10 x 8 x 10. Since putting a switch by the front door would be a lot of work - and I still would forget to put it on, I wondered if I could put a PIR on the wall, within the run of the swa to act as a switch?

    Any major problems with doing it this way?

    Thanks for your time.
     
  2. EFLImpudence

    EFLImpudence

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    Yes, there could be problems.

    You might want/need to turn it off.

    Especially if it gets wet and/or develops a fault which might cause other items to be disconnected by the protective device(s).

    You should use a double pole switch.
     
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  4. RandomGrinch

    RandomGrinch

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    As well as the double pole switch, you could also consider a smart relay.
    It would add complexity and another point of failure, but would allow programming and remote switch off if the PIR was stuck on all night!
    Edit:
    Think before posting! Would require a two output smart relay! One in parallel with PIR and one in series for full functionality! :rolleyes:
     
    Last edited: 15 Sep 2021
  5. winston1

    winston1

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    As that is a very unlikely event I wouldn't bother to do anything!

    And even if it did happen you would probably move to a nicer house anyway.
     
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  7. karlitob1983

    karlitob1983

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    Thanks to both of you for your reply.

    To be more accurate - I’m only planning to do the laying now. I’ll certainly be getting an electrician to do the work.


    Can I ask if I have the following correct:

    Consumer Unit to
    SWA to
    Double Pole Switch to
    SWA to
    PIR to
    Garden lights to
    Gland Termination.

    In other words, will/could the double pole switch be on the wall just below the consumer unit and then the swa will exit the house, then connect into the PIR and then into the garden lights; and then terminate with a gland.

    Is that right?

    thanks again for your time.
     
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