Wiring bathroom fan heater

Discussion in 'Electricians' Talk' started by coolhandluke, Dec 15, 2014.

Page 1 of 3
  1. coolhandluke

    coolhandluke New Member

    Hi there. i'm looking for some advice on adding a fan heater in our bathroom, as there are no (well ideal) power sources available, apart from spurring off the immersion heater, and there is no access to the loft and no sockets nearby to spur off without doing a long run of cable round the houses.

    So, whats left is the immersion heater circuit. As this is a radial circuit with 2.5mm T&E to a 16 amp mcb. it is not setup for the combined load. So i'm looking for a way round this, would it be viable to configure it so one can only be switched on at a time?
    This is the setup below:

    [​IMG]
     
    coolhandluke, Dec 15, 2014
    #1
  2. unphased

    unphased Screwfix Select

    Welcome to the world of the electrician! The only proper way of doing this is a new 16A radial circuit. If it means running a cable round a difficult route then that unfortunately is what you need to do. You cannot spur a load of 2kW off an immersion heater circuit, nor can you spur it off any other circuits. Heating loads of 2kW or more should be on a separate dedicated circuit.
     
    unphased, Dec 15, 2014
    #2
    FatHands likes this.
  3. seneca

    seneca Screwfix Select

    As UP said, a new circuit is required in this situation!
     
    seneca, Dec 15, 2014
    #3
  4. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Or disconnect the immersion completely!

    Mr. HandyAndy - Really
     
    Mr. Handyandy, Dec 15, 2014
    #4
  5. seneca

    seneca Screwfix Select

    Yes, that would be the other way.
     
    seneca, Dec 15, 2014
    #5
  6. coolhandluke

    coolhandluke New Member

    Unfortunately we've got no central heating so we rely on electric for hot water. I had thought it might be possible to use like a changeover switch in the airing cupboard so that whenever the fan is on, the immersion is off. But I can see that as being a big nono. Oh well
     
    coolhandluke, Dec 15, 2014
    #6
  7. retiredsparks

    retiredsparks Super Member

    Interesting question.
    If a either/or switch was used ...each item DHW/heater would at any point in use be on a "dedicated circuit".
    I cannot see any regulation which covers/prohibits this setup(off top of head)
    Not ideal but perfectly safe.
    Some cookers have a selection switch system which allows only predetermined rings to be used in unison hence limiting the load.
    RS
     
    retiredsparks, Dec 16, 2014
    #7
  8. coolhandluke

    coolhandluke New Member

    Thats what I thought. So if it's safe to do so, it's just a question of finding a suitable switch.

    How about this? http://www.ebay.co.uk/itm/SCL-IC220...ial_Automation_Control_ET&hash=item2a44f1b437
     
    Last edited: Dec 16, 2014
    coolhandluke, Dec 16, 2014
    #8
  9. retiredsparks

    retiredsparks Super Member

    Looks goods...but I
    am prepared to be shot down in flames...lol
    RS
     
    retiredsparks, Dec 16, 2014
    #9
  10. unphased

    unphased Screwfix Select

    You know what I think I would agree that using something like a changeover switch could comply. After all it is serving the purpose. You might want to supplement the installation with information that the switch should not be removed and that it is fed from one circuit etc.
     
    unphased, Dec 16, 2014
    #10
    FatHands likes this.
  11. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    I would check the specification if you can find it. "2-pole" sounds like the switch only makes live(2 x live) and does not switch neutral! (If it matters at all!)

    Mr. HandyAndy - Really
     
    Mr. Handyandy, Dec 16, 2014
    #11
  12. Caddy

    Caddy Active Member

    It will switch both live and neutral being 2 pole.
     
    Caddy, Dec 16, 2014
    #12
  13. Mr. Handyandy

    Mr. Handyandy Screwfix Select



    We'll see!

    Mr. HandyAndy - Really
     
    Mr. Handyandy, Dec 16, 2014
    #13
  14. Jitender

    Jitender Screwfix Select

    Doesn't he need some kind of DPDT switch ( Double Pole Double Throw)?

    Obviously it will need to be 230VAC rated.
     
    Jitender, Dec 16, 2014
    #14
  15. Caddy

    Caddy Active Member

    That is effectively what that switch is, although it has an "off" position as well
     
    Caddy, Dec 16, 2014
    #15
  16. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    We'll see!

    Mr. HandyAndy - Really
     
    Mr. Handyandy, Dec 16, 2014
    #16
  17. coolhandluke

    coolhandluke New Member

    We certainly will. Switch on the way, thanks guys!
     
    coolhandluke, Dec 17, 2014
    #17
  18. Jitender

    Jitender Screwfix Select

    Could you provide a link to the switch that you will be using, this could prove useful.

    Thanks
     
    Jitender, Dec 17, 2014
    #18
  19. Jitender

    Jitender Screwfix Select

    Jitender, Dec 17, 2014
    #19
  20. Jitender

    Jitender Screwfix Select

    On second thoughts it better to have to "OFF" position.
     
    Jitender, Dec 17, 2014
    #20
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