Which of the following conductors is specifically listed for wet locations?

The conductor specifically listed for wet locations is USE. This designation, which stands for Underground Service Entrance, indicates that the conductor is designed to be resistant to moisture and suitable for underground applications where it may be exposed to wet conditions. USE conductors have insulation that is resistant to water and other environmental factors, making them appropriate for use in wet locations, such as direct burial or when run through conduit in areas prone to moisture.

In contrast, while THHN, RHW, and AC conductors have their own specific applications and ratings, they do not carry the same designation for wet locations. THHN is designed primarily for dry and damp locations, RHW is suitable for wet applications but is often not as widely used in underground settings as USE, and AC (Armored Cable) is primarily used in dry locations and may not provide the additional moisture protection specified for wet applications. Thus, USE is the most suitable conductor listed for use in environments where moisture is a concern.