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#144163 - 10/17/05 03:40 PM Bathroom Exhaust Fans  
Uppeydog  Offline
Member
Joined: Jul 2004
Posts: 68
Loch Lomond
If you Install an exhaust fan with timer, & use the 5A Lighting supply Circuit, do you have to install a 3 Pole isolating Switch?


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#144164 - 10/17/05 07:07 PM Re: Bathroom Exhaust Fans  
djk  Offline
Member
Joined: Dec 2002
Posts: 1,237
Ireland
Under Irish regs, you do thesedays.

Have to be able to isolate the permanent live, the switched live and the neutral for maintenence.

If you've fans with humidistats the fan isolation switch can be very useful. We have them and on very humid days the fans can start to run constantly!

[This message has been edited by djk (edited 10-17-2005).]


#144165 - 10/17/05 07:58 PM Re: Bathroom Exhaust Fans  
Uppeydog  Offline
Member
Joined: Jul 2004
Posts: 68
Loch Lomond
Thanks DJK


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#144166 - 10/18/05 04:14 AM Re: Bathroom Exhaust Fans  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Here in NZ you would not require a 3-pole isolator.
Depending upon your type of fan, the phase coming in would be fed to the light switch and then on to the fan isolator, as in continuously live.
The fan isolator would have a switch that looks like this:

[Linked Image]

The fan supply needs to stay energised so that the timer works.
There is no need to break the Neutral.


#144167 - 10/18/05 06:23 AM Re: Bathroom Exhaust Fans  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
The 3-pole isolator has become the norm here for timed fans:

[Linked Image]

MK is now making a version with a lock out provision, although from the pictures I can't quite figure out how the padlock is supposed to work: [Linked Image]

[Linked Image]

I'm trying to think when these isolators first appeared. I think it might have been with the 15th edition (1981).


#144168 - 10/18/05 12:37 PM Re: Bathroom Exhaust Fans  
Uppeydog  Offline
Member
Joined: Jul 2004
Posts: 68
Loch Lomond
Thanks for that Lads!
Is the Isolator allowed by law to be mounted in the bathroom, or does it need to be mounted outside the bathroom?
Can it be mounted in the loft above the bathroom? (Trumpy..do you play for the All Blacks? if you do I'll see you in Cardiff on Bonfire-night!!!)


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#144169 - 10/19/05 07:30 AM Re: Bathroom Exhaust Fans  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
s the Isolator allowed by law to be mounted in the bathroom, or does it need to be mounted outside the bathroom?


Well, by law you can put it almost anywhere you like in a private house, since there is nothing legally enforcable about BS7671. [Linked Image]

However, as far as the Regs. are concerned it can go inside the bathroom, subject to being located outside the appropriate zones as for any other switch.

I wouldn't locate the isolator in the roof space unless the fan itself is mounted there (i.e. an "in line" unit with ducting to the grill over the tub/shower).


[This message has been edited by pauluk (edited 10-19-2005).]


#144170 - 10/20/05 01:14 PM Re: Bathroom Exhaust Fans  
Uppeydog  Offline
Member
Joined: Jul 2004
Posts: 68
Loch Lomond
Thanks Paul, very helpful. (AS usual)!


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#144171 - 10/21/05 04:28 AM Re: Bathroom Exhaust Fans  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
U/Dog,
Quote
Trumpy..do you play for the All Blacks?

Hehe,
At one time I probably could have, however these days, it's called Middle Age Spread and we all know what that means.
I wouldn't even get in as an Assistant Deputy Understudy to the Orange Boy. [Linked Image]


#144172 - 10/24/05 03:03 PM Re: Bathroom Exhaust Fans  
Uppeydog  Offline
Member
Joined: Jul 2004
Posts: 68
Loch Lomond
You could probably get a game easy for the Lions then!!!!


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