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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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    hopefully you'd be very careful not to assume however that the wiring was as shown above, without checking for volts..

    Not long after the change over, I  witnessed the aftermath of just such a cockup where  a large number of portable shower 'tardises' had been dropped onto a camp site, along with a 1MVA genset to power them.

    The cable tail on the hired  genset was 'old colours' and perhaps the yellow core was a bit dirty looking, and may have been mistaken for a badly made  grey, or it may have been wired by someone very tired. The dis board taking the 3 phase to lots of 32A commando sockets was however very much  wired to expect the new colours.


    By transposing 2nd phase and neutral,  essentially the black/blue confusion ensued.

    Once the genset was started, some of the showers were between 2 phases and ran very hot but failed very quickly.. Although the mistake was quickly rectified, a number of the showers were then 'cold only' for the rest of the event. Disappointing and expensive, for the sake of a quick flick on the volts range. (all dead tests had looked OK of course.)

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  • 0
    hopefully you'd be very careful not to assume however that the wiring was as shown above, without checking for volts..

    Not long after the change over, I  witnessed the aftermath of just such a cockup where  a large number of portable shower 'tardises' had been dropped onto a camp site, along with a 1MVA genset to power them.

    The cable tail on the hired  genset was 'old colours' and perhaps the yellow core was a bit dirty looking, and may have been mistaken for a badly made  grey, or it may have been wired by someone very tired. The dis board taking the 3 phase to lots of 32A commando sockets was however very much  wired to expect the new colours.


    By transposing 2nd phase and neutral,  essentially the black/blue confusion ensued.

    Once the genset was started, some of the showers were between 2 phases and ran very hot but failed very quickly.. Although the mistake was quickly rectified, a number of the showers were then 'cold only' for the rest of the event. Disappointing and expensive, for the sake of a quick flick on the volts range. (all dead tests had looked OK of course.)

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