What must insulated cables have when exposed to moisture?

Insulated cables that are exposed to moisture must be marked for wet locations to ensure safety and compliance with electrical codes. This marking indicates that the cable is suitable for use in environments where it may be subject to water or high humidity. Cables marked for wet locations often have special insulation and structural designs that enable them to withstand moisture without degrading or causing electrical hazards.

While it is important for cables to be weather-resistant and have a specific voltage rating, these attributes do not specifically address the issue of moisture exposure. Weather-resistant cables are designed to withstand outdoor environments, but the key requirement for moisture is the proper marking for wet locations, which clearly specifies their suitability in such conditions.