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 6106 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can 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
    The extractor fan requires a L and N switch for isolation purposes. I have installed two recently and seen two different circuits shown in instructions. One shows a 2-pole switch prior to the single pole service switch the other after. Both demanding that a 3 Amp fuse be fitted. For the first circuit you can simply use a 2-pole switched / fuse spur. For the second a dedicated and extractor annotated 3 -pole  switch is used. This is both expensive and and not fused, so you have to provide this separately and also use 3 core and earth cable. 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. Another advantage of the 2-pole switched circuit is that it isolates the whole circuit and not just the branch to the extractor. The switch is however supplied to give safe isolation of the fan for maintenance / removal.
Reply
  • 0
    The extractor fan requires a L and N switch for isolation purposes. I have installed two recently and seen two different circuits shown in instructions. One shows a 2-pole switch prior to the single pole service switch the other after. Both demanding that a 3 Amp fuse be fitted. For the first circuit you can simply use a 2-pole switched / fuse spur. For the second a dedicated and extractor annotated 3 -pole  switch is used. This is both expensive and and not fused, so you have to provide this separately and also use 3 core and earth cable. 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. Another advantage of the 2-pole switched circuit is that it isolates the whole circuit and not just the branch to the extractor. The switch is however supplied to give safe isolation of the fan for maintenance / removal.
Children
No Data

Community Rules & Guidelines