Extractor Fan Switch.

Colin Haggett:

geoffsd:

whjohnson:

3 pole switch required in order to isolate the fan/SELV transformer etc.

But if, as stated by perspicacious, the fuse covers both the permanent live and switched live then a three-pole switch is not necessary; a switched double-pole FCU would suffice.

The idea of the fan isolator was to keep the lights on when servicing the fan.

Just what sort of servicing does a 4 inch bathroom fan require? And, aren't there lead lamps or torches available? If "serviced" in the daytime and the room has a window, there is no need for the room light for "servicing" the fan, whatever that entails?


Also Chris, the fusing down to 3 Amps is to comply with manufacturer's instructions for some fans.


Sometimes customers buy their own fans and ask me to install them. If the fan needs a 3 Amp fuse then this arrangement seems to satisfy that requirement.


I recently installed a customer's fan in a small shower room. I ran the supply via a fused connection unit for the lights and shower fan. That was easy as the room was being refurbished and the ceiling was down. But sometimes it is not so easy if the lighting is on a B6 M.C.B. and wired three plate, or looped at switches.


Z.

Colin Haggett:

geoffsd:

whjohnson:

3 pole switch required in order to isolate the fan/SELV transformer etc.

But if, as stated by perspicacious, the fuse covers both the permanent live and switched live then a three-pole switch is not necessary; a switched double-pole FCU would suffice.

The idea of the fan isolator was to keep the lights on when servicing the fan.

Just what sort of servicing does a 4 inch bathroom fan require? And, aren't there lead lamps or torches available? If "serviced" in the daytime and the room has a window, there is no need for the room light for "servicing" the fan, whatever that entails?


Also Chris, the fusing down to 3 Amps is to comply with manufacturer's instructions for some fans.


Sometimes customers buy their own fans and ask me to install them. If the fan needs a 3 Amp fuse then this arrangement seems to satisfy that requirement.


I recently installed a customer's fan in a small shower room. I ran the supply via a fused connection unit for the lights and shower fan. That was easy as the room was being refurbished and the ceiling was down. But sometimes it is not so easy if the lighting is on a B6 M.C.B. and wired three plate, or looped at switches.


Z.