Bypassing Delay Switches

Discussion in 'Electrics UK' started by bigalxyz, 7 Oct 2021.

  1. bigalxyz

    bigalxyz

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    I have some pneumatic delay switches controlling some bulkhead lights in a long hallway. Pressing one switch causes all lights to come on - they’re all wired together.

    I’m thinking of replacing the lights with new ones with built in PIR sensors (have installed one as a test and it seems to work well) and then just bypassing the switches.

    The pneumatic delay switches just have live & neutral wires going into them. If I just whip out each switch, join all these wires up with bits of terminal block inside the holes where the switches used to be, and then cover the holes with a blanking plate, will that be a safe way to do it? Can’t see a problem myself, but am keen to get a second opinion.

    Thank you.
     
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  3. EFLImpudence

    EFLImpudence

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    upload_2021-10-7_15-13-10.png

    No, they don't.

    Join the two wires that are connected to the switch - Yes.
     
  4. bigalxyz

    bigalxyz

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    Well, a brown wire and a blue wire.

    anyway, thank you
     
  5. SUNRAY

    SUNRAY

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    Hang on a minute.

    EDIT Deleted incorrect information.
     
    Last edited: 7 Oct 2021
  6. bernardgreen

    bernardgreen

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    The PIRs will only control the lamp that they are part of. Triggering one PIR will not turn ON the other lights.
     
  7. EFLImpudence

    EFLImpudence

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    Eh?

    He might only need to connect the wires together at ONE switch but as he is removing all the switches, he may as well connect them at all the switches.

    However, as he is fitting PIR lights, he might need to use the switched lives at all the lights.
     
  8. EFLImpudence

    EFLImpudence

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  9. bigalxyz

    bigalxyz

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    to clarify: the wiring into the back of the PIR light that I’m trialling only has two wires (blue and brown) - there’s no switched live & no earth
     
    Last edited: 7 Oct 2021
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  11. EFLImpudence

    EFLImpudence

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    Do you have any other wires in the box behind any of the switches?

    If not, then it is likely that ONE of the lights has more than two wires, with two wires going to the other lights.
    In which case, only one PIR will switch on the other lights - OR - each light will be controlled only by its own PIR.

    So the wiring might be more involved than you think.
     
  12. bigalxyz

    bigalxyz

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    I’ll double check this shortly. Thanks
     
  13. bernardgreen

    bernardgreen

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  14. bigalxyz

    bigalxyz

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    the PIR sensor is an integral part of each light so each sensor only controls one light
     
  15. winston1

    winston1

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    A PIR consumes around 3 watts 24/7, around £5 a year. Multiply that by the number of lights and perhaps you may wish to reconsider.
     
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  16. bernardgreen

    bernardgreen

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    Correct, and that is why the extra wire ( shown in Purple ) has to be added to the wiring between lamps if all the lamps are to come ON when only PIR is activated.
     
  17. bigalxyz

    bigalxyz

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    Ok - understood. It’s fine for just one light to come on at a time though - don’t need all of them on
     
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