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Connecting shower fan to 45A ceiling pull cord

  • 05-03-2010 12:49am
    #1
    kgbt
    Closed Accounts Posts: 2 ✭


    Hi,

    I have a 45A electric shower that is isolated by a ceiling pull cord switch. I'd like to connect up a 3A extractor fan that will be activated when the current flows to the shower, i.e. when this switch is activated. I believe that I should be able to safely take a 45A feed out from the shower switch and connect it to a 3A dual pole fused connection unit and onto to the extractor. I've read somewhere that there is a problem making connections between the 10mm 45A cable and the FCU because the cable is too fat. I also read somewhere that one method of making the connection is via a 3A MCB - 10mm wire into the MCB, 1mm wire out the other side.

    There is no timer on the extractor fan so I don't need a continuous live feed, and I don't want to active the fan from the light circuit.

    Can anyone offer any advice?

    Thanks.
    Tagged:


Comments

  • #2
    ShamFeen
    Registered Users, Registered Users 2 Posts: 229 ✭✭ShamFeen


    I wouldn't connect it to the shower mains. Try and connect it with the light or switch it independantly. New legislation governs that a fan switch must provide isolation to the fan


  • #3
    meercat
    Registered Users, Registered Users 2 Posts: 4,828 ✭✭✭meercat


    agree with shamfeen.try get it on lighting circuit.try seperate switch if possible otherwise use inline fan with isolator in the attic.connect with centre light.maybe use 5amp pullcord.duct out facia.


  • #4
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    they're usually activated with the light (through an additional isolator).

    a humidity activated fan might help you but i'm not familiar.
    http://www.tlc-direct.co.uk/Products/BGXF100H.html

    you could automate it in theory with a current sensing type relay and modular contactor in a small enclosure
    (the type of relay they use in shower controllers)

    fan would activate when shower is actually running rather than pull-cord


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