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Wiring multiple PIRs to one final circuit?

Former Community Member
Former Community Member
Am I right in thinking that one can wire multiple PIRs switching individual light fitting in a single final circuit? For example, few full height cubicle with dedicated PIR and light fittings but all of them are being fed by one final circuit. As long as the load of the lights are below the rating of the MCB.


Thanks.

  • 0
    No problem at all. Same as having a number of manually switched luminaires on one circuit.


    Just be careful that they don't interfere with each other.
  • 0
    I have installed three PIRs controlling 6 lamps.

    Set the time on (approxiate) to be the same for each PIR otherwise your lights will be on for different times depending which PIR is triggered first.

    Legh
  • 0
    Be aware that some PIR sensors have relay contacts, and these can be safely wired in parallel so that any one sensor turns on the same lights,  however some other designs (the ones that do not click) use electronic switching and do not appreciate being fed volts back up the output side when in the 'off' state. Worth asking the PIR maker if you want to do this.


    Also allow a bit of extra current rating for switch-on inrush, especially if lots of lamps are in parallel and come on together.


    Anther 'gotcha' can occur if lights controlled by one sensor can fool the day/ night sensing of the other then you can get funny conditions where lamp being on can lock another off.


    Mike
  • 0
    " Anther 'gotcha' can occur if lights controlled by one sensor can fool the day/ night sensing of the other then you can get funny conditions where lamp being on can lock another off. "


    Good point

    I set the light sensor to minium for each PIR so that they only activate when the light falls off.

    Legh

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