I have an extractor fan on it's own (not linked with light). The switch is in the bathroom, the extractor fan is in a cupboard not accessed from the bathroom and the supply is in the loft above. The current setup is actually a mess of cables but essentially comes down to:
1st floor light circuit->3A FSU (double pole)->FAN (N and perm L)->Ceiling switch (Switch L and Perm L)
As far as I can see, the circuit can be isolated at the FSU. Lighting is also on an RCD.
1st floor light circuit->3A FSU (double pole)->FAN (N and perm L)->Ceiling switch (Switch L and Perm L)
As far as I can see, the circuit can be isolated at the FSU. Lighting is also on an RCD.