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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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    Sparkingchip:




    Chris Pearson:

    Or black, the old N, over-sleeved blue; and grey for switched line, over-sleeved brown. Same applies for 2-way lighting.




    No, that's not good practice,  it may comply with the regulations, but is not considered correct as it is continuing the idea that black identifies the neutral. 



    Not at all - the neutral conductor is identified by the blue marking.


    514 and Appendix 7 stipulate that line conductors must be marked brown. There is no reference to the use of 3-core cable for L, SwL, and N. In the absence of any regulation or even published convention, there is a free choice as to which of black and grey are used for SwL and N. The only obligation is to ensure that the same marking is applied at both ends of the same conductor!

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  • 0

    Sparkingchip:




    Chris Pearson:

    Or black, the old N, over-sleeved blue; and grey for switched line, over-sleeved brown. Same applies for 2-way lighting.




    No, that's not good practice,  it may comply with the regulations, but is not considered correct as it is continuing the idea that black identifies the neutral. 



    Not at all - the neutral conductor is identified by the blue marking.


    514 and Appendix 7 stipulate that line conductors must be marked brown. There is no reference to the use of 3-core cable for L, SwL, and N. In the absence of any regulation or even published convention, there is a free choice as to which of black and grey are used for SwL and N. The only obligation is to ensure that the same marking is applied at both ends of the same conductor!

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