Dual-rated THHN/THWN conductors can be installed in which of the following locations?

Dual-rated THHN/THWN conductors are designed to be versatile in their application. The designation THHN (Thermoplastic High Heat-resistant Nylon-coated) indicates that the conductor is suitable for use in dry locations, while THWN (Thermoplastic Heat and Water-resistant Nylon-coated) indicates its suitability for wet or damp locations.

Since these conductors are rated for both applications, they can be installed in dry, damp, and wet locations, making them suitable for various environments. This versatility allows electricians to use the same type of conductor in multiple settings, simplifying inventory and installation processes. The dual ratings ensure that the conductors meet the necessary safety and performance requirements across different environmental conditions, enhancing their usability. Thus, the correct choice reflects the adaptability of THHN/THWN conductors across different installation scenarios.