This answer is based on the 2017 NEC. A. Insulated conductors typically used in dry and damp locations include Types THHN, THHW, THWN, or THWN‑2. Other conductor insulations that can be used are Types ...
Decide how much digging you’re prepared to do and how deep your trench will be. This helps determine the type of wiring and the method you’ll use. Underground cable and wire can be installed at ...