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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:

    Indeed when wiring time controlled fans and the like with brown, black and grey only the grey needs over sleeving with blue, over sleeving the the black with brown is unnecessary, but it has become an accepted working practice to aid conductor identification.




    BS 7671 is less than clear on the matter - what's new? ?


    514.4.4 "Other conductors shall be identified by colour in accordance with Table 51." Table 51: Line of a single-phase circuit - brown. Appendix 7 para 5: Power circuit line conductors should be coloured as in Table 51. Other line conductors may be brown, black, red, etc.


    If you think that switched line is an "other line conductor" by all means leave the sleeving off. However, if you feel that Table 51 applies, the conductor must be marked brown. The latter option is, IMHO, the safer one.

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  • 0

    Sparkingchip:

    Indeed when wiring time controlled fans and the like with brown, black and grey only the grey needs over sleeving with blue, over sleeving the the black with brown is unnecessary, but it has become an accepted working practice to aid conductor identification.




    BS 7671 is less than clear on the matter - what's new? ?


    514.4.4 "Other conductors shall be identified by colour in accordance with Table 51." Table 51: Line of a single-phase circuit - brown. Appendix 7 para 5: Power circuit line conductors should be coloured as in Table 51. Other line conductors may be brown, black, red, etc.


    If you think that switched line is an "other line conductor" by all means leave the sleeving off. However, if you feel that Table 51 applies, the conductor must be marked brown. The latter option is, IMHO, the safer one.

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