At least one wall switch‑controlled lighting outlet must be installed in every habitable room, kitchen, and bathroom of a dwelling unit. (See the definition of “Lighting Outlet” in Art. 100.) ...

Habitable rooms — At least one wall switch-controlled lighting outlet must be installed in every habitable room and bathroom of a dwelling unit. See the definition of "Lighting Outlet" in Art. 100.

Say you need a bright yard light way out in your yard or a remote outlet to power a pond pump or electric tools. The best way to get electrical power right where you need it is to run underground ...