For the underground portion of the PVC conduit, Sec. 352.10(H) requires this conduit to comply with either Sec. 300.5 or Sec.

Options commonly include intermediate metal conduits, rigid metal conduits, galvanized rigid conduits, flexible metal conduits, liquid tight flexible metal conduits, rigid nonmetal conduits, ...

Underground cable and wire can be installed at different depths, depending on the type of conduit, wire or cable. Install galvanized rigid metal electrical conduit with individual insulated wires ...