Bathroom fan with timer

[5tan the man]

Whats the sequence of fitting a extractor fan with timer with regards to iso switch/fused spur/fan ?
I have gone for 3core n cpc from the ceiling rose to a 3pole iso switch, then 3core n cpc to supply side of fused spur, joining the permanent live and switched live ,then out from the load side to the fan with 3core n cpc splitting the two lives to corresponding terminals. Is this right ?

 

[staylor34]

Stan, a bit overkill, just wire from the light with a 3 core + earth into the 3 pole fan isolator, live, switch line and neutral, out with a 3 core into the fan. Is this in a bathroom? If so you shouldn't have a ceiling rose in there and the fan isolator needs to be in the correct zone,
Cheers,
Steve.

 

[5tan the man]

Thanks. The ceiling rose is a ashly j501 junction box with the same connections as a ceiling rose. Just wanted to keep it simple. The fan is in a cloakroom with a toilet n sink ,the f/s and iso switch will outside. My reason for the fused spur was to put a smaller 3amp fuse in as the lighting circuit is fed from a rewireable fuse with a 5amp wire in. Do you think it would be ok without the f/s?

 

[truckster]

As staylor34 says, this is probably how 99% of fans are wired but a recent court case found the sparky negligent because he didn't put in a 3A fused spur as per manufacturers instructions (go figure) The way I do it is l/n from light to f/spur then twin to pull cord and three core to fan or insert a 3A spur into the light feed and do as staylor says.

 

[sedgy34]

agreed overkill!!! nothing stopping you put the isolator in loft next to fan if its an inline type or outside above the door if its a bathroom

 

[staylor34]

Maybe the manufacturers should look at making a 3 pole isolator with a fuse, like a spur? thus fan protected, gets a bit messy with a spur and 3 pole isolator especially as they really should be accessible for local isolation.

 

[5tan the man]

Thanks.I thought that. Must admit the way I've got the switching setup it looks a bit over the top but i thought I'd go for safety first.

 

[Guitarist]

From your description it looks like you have linked the switched and perm live together, so the unit will just run continuously, unless I read it wrong....
If the manufacturer says that it must have a 3A fuse then to comply with BS7671 you must do exactly that.
Normally, the FCU feeds the circuit for the light in that room, then split.

 

[One_of_them]

surely joining the perm and switched together in the fcu terminal will mean the sw/l will be ineffective and your light and fan will be permo on?

.....ahh beaten again

 

[DaveyD]

XPELAIR are 5a so I dont fuse down personally just the 3 pole switch. Unless I can do the whole bathroom eg a extension then I might fuse the whole lot.

 

[5tan the man]

Dam. Forgot about that. Ah well out goes the f/s then. Thanks all

 

[Guitarist]

You can always use the "Thanks" button also, if you think we have been of help

 

[Stig40]

of course if the cloakroom as a window you do not need the fan isolator

 

[sedgy34]

of course if the cloakroom as a window you do not need the fan isolator

Think you mean the overrun as fans need local isOlation

 

[Stig40]

does this mean I am misunderstanding, as the point of separate fan isolation is for maintenance