The term 'enclosed conduit' can be abbreviated to 'DUCT, ' which is a four-letter word. An enclosed conduit is a type of pipe or tube that is used to protect electrical wiring, cables, and other items from the elements. It is typically made of metal, plastic, or fiberglass and is designed to keep out moisture, dust, and other debris. The conduit also provides a physical barrier between the wiring and any potential hazards.