What type of conduit is typically used for underground installations due to its corrosion resistance?

PVC conduit is favored for underground installations primarily due to its excellent corrosion resistance. This is a significant advantage when considering the harsh environmental conditions that underground installations may face, such as moisture, soil acidity, and potential exposure to various chemicals. PVC, or polyvinyl chloride, does not corrode like metal conduits, ensuring the integrity of the conduit and the protection of the electrical wiring over time.

Furthermore, PVC is lightweight, making it easier to handle and install, which can also contribute to cost-effectiveness in large-scale projects. Its non-conductive properties are beneficial in preventing electrical shorts in the event of moisture intrusion. This combination of durability, ease of installation, and resistance to environmental factors make PVC conduit a suitable choice for underground electrical installations.