Which type of wire would not be suitable for wet locations?

The type of wire that would not be suitable for wet locations is NM, which stands for Non-Metallic Sheathed Cable. This type of cable is designed primarily for indoor use in dry locations and is not resistant to moisture. In wet environments, NM cable can deteriorate, leading to potential electrical hazards.

On the other hand, THHN (Thermoplastic High Heat-resistant Nylon-coated), THWN (Thermoplastic Heat and Water-resistant Nylon-coated), and UF (Underground Feeder) cables are suitable for wet locations. THWN, specifically, is designed for wet applications and provides protection against moisture, while UF is also rated for direct burial and wet environments. THHN, when used in conjunction with the proper insulation rating, may also be employed in damp situations if it is listed for such use.

In conclusion, NM cable lacks the necessary rating and construction to withstand exposure to water or moisture, making it unsuitable for wet location applications.