Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 39 replies
  • Subscribers 32 subscribers
  • Views 6024 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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
Parents
  • 0

    However I think second maybe the preferred method as the industry supplies the annotated 3 pole switch, but I have not seen an annotated 2-pole switch.



    Arguably there's little need to produce a dedicated fan-symbol marked 2-pole isolating device - as you can always employ the 3-pole version and leave one pair of terminals unused.  It's the same with simple lightswitches - if you want a 2-gang one you can only get it in 2-way versions - so you just have to leave the extra terminals unused for 1-way switching. The waste of the extra metal etc is far offset by the savings of not having multiple different products (and lower volumes of each).

     

    Another advantage of the 2-pole switched circuit is that it isolates the whole circuit and not just the branch to the extractor.



    But has the disadvantage of isolating the light as well as the fan - which can be a nuisance especially in bathrooms with no window.


      - Andy.
Reply
  • 0

    However I think second maybe the preferred method as the industry supplies the annotated 3 pole switch, but I have not seen an annotated 2-pole switch.



    Arguably there's little need to produce a dedicated fan-symbol marked 2-pole isolating device - as you can always employ the 3-pole version and leave one pair of terminals unused.  It's the same with simple lightswitches - if you want a 2-gang one you can only get it in 2-way versions - so you just have to leave the extra terminals unused for 1-way switching. The waste of the extra metal etc is far offset by the savings of not having multiple different products (and lower volumes of each).

     

    Another advantage of the 2-pole switched circuit is that it isolates the whole circuit and not just the branch to the extractor.



    But has the disadvantage of isolating the light as well as the fan - which can be a nuisance especially in bathrooms with no window.


      - Andy.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines