What type of conduit is generally used for underground wiring?

Non-metallic conduit is commonly used for underground wiring due to its resistance to corrosion and ability to withstand moisture and other environmental factors. The material is lightweight, making installation easier, and does not conduct electricity, which enhances safety in wet conditions.

Additionally, non-metallic conduit, often made from PVC (polyvinyl chloride), provides a durable protection for electrical wiring in buried applications, adhering to electrical codes and standards that govern underground installations. This conduit type is also flexible enough to navigate around obstacles while providing a secure housing for wires.

Other types of conduit, such as flexible conduit, rigid conduit, or electrical plastic wrap, may not offer the same level of protection against environmental hazards or are not typically used for underground installations for various reasons including structural integrity or moisture resistance.