On 27/10/2020 20:15, me wrote:

What about if I feed the permanent fan supply from a light fitting as
normal with 1.5mm twin and earth cable and then run a 1mm twin and
earth cable from the shower pull switch just for the switched live
feed?

Really *really* bad idea - that would be powering one appliance from two
separate circuits (which might not even share a RCD!)

(not to mention feeding a lighting circuit wired in 1 or 1.5mm^2 T&E
from combined nominal current rating on a pair of MCBs that could be
over 50A)

That way the fan goes on with the shower pull switch but is not
fed permanently by the shower circuit. Not sure where to fuse though
if it is ok?

If you want to do something like that, then you would be better with an
arrangement like:

http://wiki.diyfaq.org.uk/index.php/...tivated_switch


--
Cheers,

John.

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