Conduit systems are protective raceways that enclose and route electrical wiring between equipment, junction boxes, and termination points. Common types include rigid metal conduit (RMC), intermediate metal conduit (IMC), electrical metallic tubing (EMT), and PVC, each selected based on environmental exposure, mechanical protection needs, and area classification. Conduit sizing accounts for conductor quantity, fill percentage, and pulling tension limits to ensure proper installation and future cable accessibility.