Is there any rule or code requirement for installing 15KV cable in rigid metal conduit vs. EMT when inside a building? I've seen it most often in rigid metal conduit when inside a building. I can't seem to find anything on this in the NEC.
300.37 Aboveground Wiring Methods
Aboveground conductors shall be installed in rigid metal conduit, in intermediate metal conduit, in electrical metallic tubing, in rigid nonmetallic conduit, in cable trays, 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.