Two PIRs for one light?

[rantoftheday]

Is it possible to wire up a lighting cicuit so that there are two PIRs controlling one light so that if any PIR is activated the light comes on?

And if so does anyone have a wiring diagram for such a system?

 

[nabba]

Taking a 3 core from fitting to pir , and so on and on to the next pir or multiple whatever the case , are you suggesting a 3 core providing the fitting your coming from is possibly a EM fitting or has a looped perminant feed as you would need a perminant live also to each pir, ?
Just was trying to understand the way you wrote it As it wasn't stated in your post
Thanks

 

[nabba]

Hi Richard I have looked at your overide switches, I need to install one in a small office the lights are switched via a motion sensor at the moment but need a switch to turn off the lights when a projector is in use when in meeting, looking at your drawings paralleling a manual switch this way would it work??? Never installed a overide switch before would I not have to kill the perm feed to sensor??

 

[Guest111]

There are 2 ways to do what you want,either install your switch in the perm live to the sensor or in the switched live from the sensor.When we talk about an override switch on pir,s it is normally to make the light stay on and is wired across the perm live and switched live,what you want is really a cut out switch to prevent pir from switching light on,hope this helps.

 

[Richard Burns]

I would put a switch in the switched live going to the light (after the PIR) because then the sensor will not need to be restarted each time.

 

[nabba]

Hi Richard , still wet behind the ears from collage so just a guide pls if you would 4 PIRs on one lighting circuit so in order to make either sensor switch lights on , as your drawing would I just parallel up all PIRs first ? then off to my lights or could I just loop in and out through my lights as I go till I get to next pir and so on , as long as all perminant wires and switch wires go we're they need to go ?

Thanks

 

[Richard Burns]

Easiest thing to do is take a supply to the first PIR and then use three core+E thereafter either going to a PIR or light as required.
At each point you would parallel all connections but the permanent line would be just looped in each lamp.
If the last point(s) are lights then you would only need T&E as you would no longer need the permanent line.

A slightly crowded diagram going from PIR to light to PIR, etc.
Obviously you could have them in any order i.e. PIR. PIR, PIR, light, PIR, light, light, light.
The last three lights only needing T&E.

 

[bigspark17]

Usually for any pir sensors application you would need a local isolator, wire all sensors in 3core &earth back to the isolator (or linked), wire the light (s). From there you can connect at ease, and if wired individually one cable got damaged you can isolate without disrupting other sensors/lights until you get it repaired or changed. As for an override, a single pole switch between permanent live and switched live at any point.!