480V circuit in EMT

[iwire]

I imagine you could put medium voltage cable in EMT if you wanted.

Yes

II. Requirements for over 1000 Volts, Nominal

300.37 Aboveground Wiring Methods. Aboveground
conductors shall be installed in rigid metal conduit in intermediate
metal conduit, in electrical metallic tubing, in
RTRC and PVC conduit, in cable trays, in auxiliary gutters,
as busways, as cablebus, in other identified raceways, or as
exposed runs of metal-clad cable suitable for the use and
purpose. In locations accessible to qualified persons only,
exposed runs of Type MV cables, bare conductors, and bare
busbars shall also be permitted. Busbars shall be permitted
to be either copper or aluminum.

 

[480sparky]

And I doubt you see any limitations in any of the raceway articles, you don't apply voltage to the raceway you apply it to the contained conductors.

360.10(4).
362.12

 

[kwired]

360.10(4).
362.12

Both those raceway types nearly need to be limited to 50 volts or less anyway

They are for appearance not physical protection.