Originally Posted by hbsparky
and as for the romex in conduit, can't do it, the outer sheath on the romex is considered a conduit and you can't run conduit in conduit.
The fact that this is not true is a subject for a whole 'nother thread.
The fact is NM cable (romex) cannot be used in conduit underground.
NM cable in a conduit system
is also considered extremely bad practice.
I would run a 3/4" conduit from the floor box to a nearby partition wall and stub up there. Then run UF cable in that conduit sleeve
to the box.