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extraction fan

Discussion in 'Electrics UK' started by thershow1, 30 Apr 2016.

  1. thershow1

    thershow1

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    20160430_183635-480x853.jpg 20160430_184834-480x853.jpg Hi guys
    Looking to wire up an extractor fan to an isolation switch. Im going to wire it from the bathroom light which only has a neutral, switched live and earth so will need to pull a permanant live off a different room rose. Can someone advise how to wire
     
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  3. Find out where the live to the bathroom light comes from, and pick it up from there, and take the switched live from the bathroom light - take the neutral from either, but an earth isn't normally used in an extractor, because it's plastic.
     
  4. thershow1

    thershow1

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    Thanks doggit could you tell me how to wire the switch please?
     
  5. The switch doesn't say load and supply, so you can put the wires in either way round, Neutral to L3, and say Live to L1, and switched live to L2. On the fan, Live to L, and switched live to LT
     
  6. ban-all-sheds

    ban-all-sheds

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    Make sure it's from the same circuit though.
     
  7. thershow1

    thershow1

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    Thanks again doggit.
     
    Last edited: 1 May 2016
  8. thershow1

    thershow1

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    Do i need to earth the switch as i only have 3 core in place or do i need to lace a new wire?
     
  9. bernardgreen

    bernardgreen

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    As it is metal faced then yes it must be earthed.
     
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  11. thershow1

    thershow1

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    Thanks bernardgreen
     
  12. Taylortwocities

    Taylortwocities

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    All cables for fixed wiring should have an earth (Cpc) included.
    It is not acceptable to use the unsheathed earth conductor for anything but earth.
    Look in the WIKI for a full diagram on how to wire the fan.
     
  13. thershow1

    thershow1

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    Just traced the wires through but all roses seem to be like this 20160501_122606-480x853.jpg
     
  14. ban-all-sheds

    ban-all-sheds

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    Unless your lighting circuit loops through the switches there will be JBs with the terminals you need to connect your 3C+E for the fan.
     
  15. sparkwright

    sparkwright

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    Best practice to power a timed fan is to use 3 core and earth cable, and try to pick up the supply all from the same point.

    In your case there will be a junction box where you can obtain this - or if not, as said, the switch may be the answer.

    There will of course be a permanent live at the bathroom switch, if you insist on doing it how you originally said.
     
  16. thershow1

    thershow1

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    Confusing myself now! And cant sort my head out. I have a junction box which seems to be a linker from replacing a pull chord switch to a rocker switch. Their are no other boxes i can locate. I cant take directly off the bathroom spotlights as they are in sealed units.
    So the bedroom to either side has the attached pic roses. And the switch is as shown??! 20160428_184141-320x180.jpg 20160501_170633-480x853.jpg 20160501_171011-480x853.jpg
     
    Last edited: 1 May 2016
  17. ban-all-sheds

    ban-all-sheds

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    And they won't have a permanent live anyway.
     
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