What type of conduit is typically used for underground installations?

The use of Schedule 40 PVC conduit for underground installations is preferred due to its resistance to moisture, corrosion, and degradation from soil chemicals. Schedule 40 PVC is lightweight, easy to handle, and can be easily cut to length, making it an efficient choice for running electrical wiring underground. Its ability to withstand various environmental factors ensures that the electrical systems remain safe and functional over time.

Moreover, Schedule 40 PVC also adheres to building codes and standards for underground installations, providing protection for the electrical conductors within. This type of conduit is typically non-metallic, reducing the risk of electrical hazards associated with moisture and conductive failures that can occur with metal conduits.

In contrast, while rigid conduit offers robustness, it can be harder to work with and is generally not as commonly used underground without specific insulation or protection. Flexible conduit is more suited for areas requiring movement or flexibility rather than static underground installations. EMT (Electric Metallic Tubing) is also not typically used underground due to its susceptibility to corrosion when exposed to moist environments. Hence, Schedule 40 PVC stands out as the ideal choice for protecting electrical systems in underground settings.