What type of conduit should a feeder from a dwelling unit to a detached garage be installed in?

The correct choice for installing a feeder from a dwelling unit to a detached garage is rigid PVC conduit. This selection is suitable due to several important factors related to electrical installation standards and environmental conditions.

Rigid PVC conduit is known for its durability and resistance to moisture, making it an ideal choice for underground applications where the feeder line might be buried. This type of conduit also offers excellent protection against physical damage and is non-conductive, which enhances safety.

In general, electrical codes often recommend using rigid PVC conduit for outdoor and underground applications because it protects the wiring from the effects of water ingress and ground movement, which could cause wear and potential failures in the electrical system. Additionally, PVC conduit is lightweight, easy to handle, and can be cut and joined quickly, making the installation process more efficient.

While other types of conduits have their uses, they may not provide the same level of protection in all conditions, particularly when burying the conduit underground or in locations subject to moisture and physical stresses.