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UK toilet extractor fan
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Majorbob:
Hi All,

I'm bricking up a window and installing a timed extractor fan in my downstairs toilet.  This room is just a toilet, no basin or anything else.  The only power it will have is a 6A lighting circuit and it is very lightly loaded.  It's connected to a local secondary CU that just serves a small home-salon and this toilet.

Manufacturers manual suggests a 3A FCU but do I really need to?

If maintenance has to be carried out the whole circuit can be isolated at the MCB without affecting the main house.  This is not the only toilet in the house and it gets plenty of light during the day.

Fan is 17W on a 240V circuit so if it's using anywhere near enough to blow a 3A FCU there is a serious problem.
Gyro:
Unfortunately, the IET wiring regs always defer to the manufacturer's instructions. If the manufacturer specifies a 3A fuse, then there must be a 3A fuse to meet the regs.

The requirement is that an electrician must be able to isolate the fan to work on it in safety. It's debatable whether natural daylight is sufficient if it's a dull rainy day or evening call-out. Isolating the lighting circuit at the MCB may be sufficient, but in the case of a serious fan fault (smoke) means that you can't get the lights back on... but this is all secondary to the wiring regs requirement that I mentioned above, you need to fuse it at 3A to be compliant.


P.S. If you look at the Toolstation website for Click Grid modules, it's possible to fit a 3 pole fan isolator switch (Permanent live, switched live, and Neutral) and a fuseholder into a single width front plate. Product codes 75262, 93193, and 49473. Not expensive.
Majorbob:
Ok, thank you for the clarification.  That's a minor irritation but not a problem.  I have a spare FCU I bought for another project and a single gang backplate so easy enough.
eti:
One uses the word "lavatory", if one has any breeding and civility.
Monkeh:

--- Quote from: eti on August 17, 2021, 07:18:41 pm ---One uses the word "lavatory", if one has any breeding and civility.

--- End quote ---

And the rest of us just say bog.
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