On 04/09/2012 12:25, Thomas wrote:
Hello

Planning on installing an extractor fan in the en-suite to reduce
condensation - currently looking at:
http://www.extractorfanworld.co.uk/a...-fan-129-p.asp

Wondering about how to activate/deactivate the fan. Options seem to be:

(1) dedicated on/off switch
(2) wired to light circuit with 2 min delay
(3) wired to light circuit with in-line isolator switch

I tend to favour (3) since it allows the light to be on without the fan -
good for those occasions when lighting only is needed. What are the regs
concerning switches, fuses etc?

Also wondering about best place to install - currently favouring ceiling
mount near door rather than directly above shower cubicle.

Any comments?

Thanks
Thomas


You have to install an isolator switch for it, these are generally
installed outside the bathroom - If you have a fan that has a built in
timer and is activated by the lights, then you need a three pole
isolator like this
http://www.tlc-direct.co.uk/Products/MKK4859.html

It will switch Neutral, permanent and switched live.

With this, you can simply install a timed fan (an/or a humidistat) and
turn this switch off when you just want lights and no fan, for the
midnight relief.

If the fan is just a simple fan without a timer, or their PIR model
(assuming this doesn't need a connection to the light switch as well as
a permanent supply) and you want intendant control, then you just need a
normal switched fuse spur like this
http://www.tlc-direct.co.uk/Products/MKK1040.html

The fan instructions will specify what fuse rating it requires, if that
matches what your lighting circuit is protected with, then you won't
need to install an extra fused spur like this if you choose the timed
type with a fan isolator switch.
http://www.tlc-direct.co.uk/Products/MKK0337.html


--
Toby...
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