Which type of cable is prohibited for use in damp or wet locations?

Type AC armored cable is not permitted for use in damp or wet locations due to its construction and the materials used. Type AC cable, which is an armored cable, typically has a flexible metal sheath that provides physical protection and grounding but is not watertight. Exposure to moisture can lead to potential corrosion and degradation of the shielding and conductors, compromising both the integrity and safety of the electrical system.

In contrast, other types of cables mentioned can be used in damp or wet locations under certain conditions. For instance, Type NM cable is generally not suited for these environments because it lacks the necessary moisture-resistant features, but it is specifically prohibited due to not meeting the standards for wet conditions. Type MC cable has a metal sheath that provides some protection against moisture, while Type UF cable, designed specifically for underground use, is rated for direct burial and is moisture-resistant, making it appropriate for wet locations.

Understanding the limitations and applications of different types of cables is essential for ensuring safety and compliance with the National Electrical Code (NEC) in various environmental conditions.