On Sat, 24 Oct 2020 11:58:18 +0100, Pancho wrote:

Yes. But if you're putting in once Cat6 put in another if not
three
more. They can share the same conduit. As can the mains. Cable is
cheap, installing it isn't.

Switches are cheap, too.

If you're thinking just bung in one cable and pop a switch on the end
yes that works, provided the single cable doesn't fail. Should it do
so you don't have a "spare" to quickly change to.

Replacement brings you straight back to where you are now, installing
from scratch. Do not expect to be able to pull a new cable through
(or the old one out) of the conduit unless it is dead straight and
you have access at any bends. You *might* be able to if you can find
a proper cable pulling lubricant but I wouldn't like to bet on it.

--
Cheers
Dave.