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AdieG
Junior Member
Joined: 13 Oct 2008
Posts: 1
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 Posted: Mon Oct 13, 2008 7:40 pm Post subject: Installing an Extractor Fan |
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A little help please...
I have recently purchased an extractor fan with timer (greenwood variety). I want the fan to run independently of the bathroom light. I have installed an fused double pole switch outside the bathroom next to the existing bathroom light switch and I have then run a spur from the loft down to the new switch. From this fused switch I have run the cable from the switch into the bathroom within the cavity. It is here that I have a little problem....From the switch I have a Live and a Neutral, but the fan has a Live, Neutral and a Live 1. I have attempted to connect the fan to the Live and Neutral but this hasn't powered up the fan. From looking at the diagram it would appear that it wants the bathroom light to be connected to complete the circuit. However, as mentioned previously I want the fan to work separate from the bathroom light. Would I be right in assuming that I could run a loop from the Live to the Live 1 to complete the circuit? or have I purchased an already bust fan as I should be able to power up the fan by just connecting Live and Neutral..?
Any help would be greatly appreciated.... |
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IDontBelieveIt
Approved Electrician
Joined: 29 Jul 2008
Posts: 1193
Location: North Hampshire
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| Posted: Mon Oct 13, 2008 8:19 pm Post subject: |
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Well, timer based extractor fans need a permanent live, a switched live and a neutral (in most cases and earth is not required as most now are Class II) and ALL three MUST be connected.
The permanent live is needed as conventionally the switched live would come from the light live of the room light.
So in theory, and I mean in THORY, you could supply the fan with a live that feeds the fused spur, the switched live that is the live out of the fused spur and the neutral from the SUPPLY side of the supply to the fused spur (not the output of the fused spur).
Sadly I think you have wasted your time!!
And I it gets worse I am afraid. Because the extractor fan has a permanent live you also now must fit a 3-pole extractor fan isolating switch as well! One of these or like these -
http://www.tlc-direct.co.uk/Main_Index/Wiring_Accessories_Menu_Index/White_Contactum_Index/Fan_Switches_CM/index.html
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Never lie - that way you don't have to remember what you said. |
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sparkydude
Approved Electrician
Joined: 13 Aug 2005
Posts: 942
Location: Staffordshire
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| Posted: Tue Oct 14, 2008 6:11 am Post subject: |
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When you say you have a live and nuetral at the existing switch , do you have only two cores a red and a black at the switch ? if so then you have anopther problem as there is not a neutral at that switch it is just a live and switched live. You would need to obtain a neutral from the light fitting which is a lot easier to do as IDBI has said.
Just because you have a red and a black or a brown and a blue at a switch DOES NOT mean you have live and neutral, if you have alook on this site at three plate wiring it will explain it to you more
Nick
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If it isnt broke dont bloody touch it until it bloody well is and if it is broke then make drawing of the connections before you remove the broken one and replace with a new one LoL |
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