RBM (remove this) wrote:
NEC requirements for buried wiring vary depending upon amperage of the
circuit, type of conduit, type of protection, such as ground fault, and
direct buried cables. It also varies depending where the trench is, such as
under a driveway, road, etc. etc. Personally, in a residential application I
like to sleeve U.F. cable through PVC pipe or flexible non metallic conduit,
for added protection. More protection is obviously better. In your
situation, at the very least I'd install GFCI protection on the circuit

I am familiar with GFCI outlets, but in this case the wire goes right
from an internal light switch directly to the lamp post. Is there a
different type of GFCI unit that can be placed inline?

Amy