At my factory job, there are machines, lifts etc. with EMT conduit running
on the floor. Best I can get from the codes are that the conduit must be
supported(anchored) less than or equal to every 10 feet and 3 feet from
terminations. I don't have specs to floor areas w/traffic. Check out Chapter
358.xx (2002) Another poster suggested THWN wire, and I strongly agree. The
"W" is for wet.
Use LiquidTite conduit if there is any chance of standing or running
water. As long as it isn't a trip hazard, the inspector shouldn't
have any problems with it. We used to use it all the time for power
runs under raised computer-room floors, where there was a chance of
water if and when the HVAC system leaked, or in one case, the roof on
an old building.
You should have a short length of flex at the machine end, anyway, if
you use rigid conduit -- with liquid-tite, you don't need to bother
with that, so saves you a bit of trouble there.
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