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PIR plus switches to force off/on

Discussion in 'Electrics UK' started by MisterBoy, 4 Nov 2020.

  1. MisterBoy

    MisterBoy

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    We have some security lights installed, 3 lights and a separate PIR. However there are also 2 switches - one overrides the PIR to turn the lights on, the other turns them completely off.

    The ON switch must be making use of a permanent live in parallel to the PIR switched live, and I assume the OFF switch is an isolator, but what might that circuit diagram look like?
     
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  3. SUNRAY

    SUNRAY

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    I'll happily make a guess at the circuit but can I ask why you wish to know? and additionally are the 2 switches together on one plate or totally apart and where do the cables run relative to all of the fittings?
     
  4. MisterBoy

    MisterBoy

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    Mainly I was curious, partly with playing around with smart switches and stuff I was coming across a similar sort of situation. Lighting gets complicated fast in my experience as you add multiple switches, etc.

    And yes two separate switches. It's handy because you can force it on for a BBQ, but also you can turn it off for maintenance or if you want to look at the stars - we're out in the country with no street lights.
     
  5. EFLImpudence

    EFLImpudence

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    Various wiring methods, but

    First switch
    Input - power
    output - to PIR and input of second switch

    Second switch
    output - to lamps.
     
  6. SUNRAY

    SUNRAY

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    This is the basic set-up:
    upload_2020-11-4_13-52-52.png
    However the position of devices within the circuit are by no means fixed, for example the lights can easily be connected on the grey and black wires at the switch.
    The switch marked isolator may only be single pole, in which case it is not adequate as isolation for maintenance.

    EDIT:

    Crossed in the post again.
     
  7. MisterBoy

    MisterBoy

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    Thanks guys appreciate it. Practical electronics is really interesting.
     
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