Humidi fan off shower circuit

[colshaws]

Hi All
I am currently doing a bathroom and customer wants a humidistat fan fitted, I have limited access to the ceiling due to a ensuite above so I cant tap into light circuit. There is a redundant shower circuit(10mm) feeding an isolator outside the bathroom and then into the room, I want to extend this circuit to the small crawl space above and fit the fan on this . Do I need to fit an FCU before the fan and what rating mcb should I use at the D,B. The circuit is rcd protected. Hope this all makes sense.

 

[yellowvanman]

Can't see a problem in using an oversized cable, if you put a 6A MCB in at the CU then you shouldn't need to put in an FCU, as it would be like any other fan setup on a lighting circuit. You should clearly label the new circuit so that anybody coming along later understands what you have done.

No need for a fan isolator switch also, if its the only appliance on the circuit!

 

[pushrod]

Agree with what yellowvanman man says, particularly labelling at CU, only problem could be that the instructions with the fan may well specify no more than a 5A fuse and a DP isolator! In which case you will have to spend a few quid on an FCU - and just use the shower isolator .