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Wiring PIR sensors, Extractor fans, LED panel lighting, overide switch. In one circuit

Former Community Member
Former Community Member
Hi,


I am currently level 2 Qualified 2365 and beginning my level 3. 

​​​​​As my interest in the field increases I always observe electrical installations, I noticed one day in a public toilet, the ceiling panels were lifted and the Extractor fan, PIR sensor, Panel lighting, and override switch we're all wired in one circuit using wago connectors. 

Now I can't help it but I really need to work out how this was wired in a wiring diagram, I have an idea as to how, but not sure.


But my question is, as normal do we calculate the whole load of this circuit and then use the correct rated mcb, and if anyone could provide me with a wiring diagram or explain how it works. I think I even noticed some resistors used. 


Thanks for your help
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    ebee:

    Just a word about PIR sensors.

    Some types you can wire in parallel and some you can`t.

    i.e, two or more sensors to operate one light or group of lights can sometimes be an advantage.

    Always check with a manufacturer to see if compatable otherwise you might find the output on one PIR might hold the other PIR(s) output permanently on.

    A way around this if, for some reason, you want to use a non compatable PIR is to wire the outputs each into its own relay or contactor then para up the relays switched outputs.

    The same thing applies to central heating zone valves too.




    I've paralled three PIR detectors together controlling five outdoor lights around the house. Depending on which one is triggered first will depend on how long the lights stay on. I've attempted to get the timing as near to each other as possible.


    Legh

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  • 0

    ebee:

    Just a word about PIR sensors.

    Some types you can wire in parallel and some you can`t.

    i.e, two or more sensors to operate one light or group of lights can sometimes be an advantage.

    Always check with a manufacturer to see if compatable otherwise you might find the output on one PIR might hold the other PIR(s) output permanently on.

    A way around this if, for some reason, you want to use a non compatable PIR is to wire the outputs each into its own relay or contactor then para up the relays switched outputs.

    The same thing applies to central heating zone valves too.




    I've paralled three PIR detectors together controlling five outdoor lights around the house. Depending on which one is triggered first will depend on how long the lights stay on. I've attempted to get the timing as near to each other as possible.


    Legh

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