Champions School Home Inspection Practice Test

The recommended wire for underground wiring is UF cable, which stands for Underground Feeder cable. This type of cable is specifically designed to be used in wet and damp locations, making it suitable for underground applications where moisture is a concern. UF cable is constructed with a durable outer jacket that resists moisture and is rated for burial directly in the ground without the need for additional conduit.

It is important to use appropriate wiring for underground installations to ensure safety and compliance with electrical codes. While other types of cable, such as NM cable (commonly known as Romex), are suitable for indoor residential use, they are not designed for exposure to moisture or direct burial. THHN wire, on the other hand, is typically used for indoor wiring or in conduits and is also not suitable for direct burial without additional protective measures. Therefore, UF cable stands out as the best choice for underground wiring applications due to its specific design and protective qualities.