Which of the following may not be used in damp or wet locations?

Type NM cable, also known as nonmetallic sheathed cable, is specifically designed for dry locations. It is not suitable for use in damp or wet locations due to its construction, which typically includes insulation materials that are not moisture-resistant. Using Type NM cable in environments where it may encounter moisture could lead to failure of the insulation, potential electrical hazards, and violations of electrical codes.

By contrast, other cable types listed, such as Type UF and Type MC cables, are rated for wet locations. Type AC armored cable can also be used in some damp conditions, but its suitability is dependent on specific installations and local codes.

Understanding the limitations and applications of different cable types is essential for ensuring electrical safety and compliance with applicable regulations.