Stefek Zaba wrote:


But you wrote in your earlier posting, 'I want to be able to override
the fan using the switch, but still be able to use the lights'. Not sure
what you mean by 'override' here. If you want only to be able to turn
the fan *off* sometimes, an on-off pullswitch in its permanent-live
would do the business. If you want only to be able to turn it *on*
sometimes independently of the lights, a change-over pullswitch so it
takes its 'trigger' input either from the light's switched-live or from
its perm-live would do the trick - but it seems unlikely to be all that
useful, since you can get the fan to come on and run for the duration of
its run-on timer by flicking the lights on and off. If you want full
three-way control of the fan - 'perm off, comes-on-with-light, perm-on',
you're either into using a single centre-off double-pole toggle-switch
(*please* use one with a plastic paddle, and mount it outside the
bathroom), so that the 'trigger' feeds from either perm-live
("perm-on"), nothing (the centre-off position), or the light's
switched-live ("comes-on-with-light"), or accepting that the isolator's
a perfectly good thing to operate for the 'perm-off' function, leaving
the pullswitch changeover (or a normal 2-way plateswitch mounted outside
the bathroom, or at least in Zone3 or non-zone) to select 'perm on' or
'light-controlled'.

HTH, rather than confuses - Stefek


Thanks very much - that clarifies enormously.

I'm trying to get it so that the fan can be off during the summer (when
windows are open) and occasionally off in winter (eg when there are lots
of people here using the bathroom for purposes that don't create much
steam).

I hadn't thought of simply sticking a single pole switch in the perm
live to fan.

I suppose it could be a pullswitch with a very short pull, so as not to
be confused with the light.

Then again, I suppose I really should remove the present FCU from above
the bath and replace it with an isolator which isolates N + *both*
Lives. Logical solution would be a 3 pole switch outside the bathroom.
Perhaps marked 'FAN'!

Funzbo