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[ezekiel]

got a timed fan, and ran 3core from rose to triple pole isolator anto fan and everything fine but instructions say fuse down to 3a, as i have a live and switched live where do i put the fcu in the circuit?

 

[wingcoax]

Idealy where you got your live/s from then both will be protected.

 

[ezekiel]

maybe im not being clear would i put fcu into cable before it enters light fitting?

 

[securespark]

If you are triggering the fan from the same switch you use to turn the bathroom light on with, then use the lighting loop to feed an FCU, the outgoing side of which feeds the light via the switch, the fan connected to the permanent live (from the outgoing feed of the FCU, the switched live (from the switch) and the neutral, all connected through a TP switch.

HOWEVER, the problem with this is that (as with all fans fed via the bathroom light switch) you need the light on to have the fan on.

If you wire an independently-fed switch for the fan, you don't need the light on to have the fan.

 

[ericmark]

Most people don't bother to fuse to 3A and just hope the 6A lighting feed will be OK. A few people have asked the manufactures and have received a variety of replies as to if the existing 6A is good enough.

Others have used double pole lighting switches or fused the bathroom lights also to 3A.

There is only one way to find out if the 3A recommendation is just because with a BS1361 fuse preferred sizes are 3 or 13 amp and with MCB's 6A is OK. Or if it really needs 3A is to ask the manufacture. And maybe if enough ask they will start to put the info on the box!

 

[ban-all-sheds]

If you take a branch from the lighting circuit to a switched FCU, and then the live from that through one side of a DP switch which replaces the existing switch then you won't need the 3-pole isolator.