When is it acceptable to use a non-metallic sheathed cable?

Using non-metallic sheathed cable is acceptable in dry locations, as this type of cable is designed for residential wiring and other applications where exposure to moisture is minimal. It is primarily intended for use within walls, ceilings, and floors in structures where the environment is controlled and protected from the elements, making it an ideal choice for indoor applications.

Non-metallic sheathed cable generally cannot be used in wet locations because its insulation can degrade when exposed to moisture over time, leading to potential hazards such as short circuits or fire. Similarly, while it may be suitable for some dry locations, it is not recommended for environments with high humidity, as prolonged exposure to moisture can still pose issues for the cable's insulation and overall safety. Therefore, the selection of non-metallic sheathed cable should always align with the environmental conditions outlined in the National Electrical Code (NEC) and local building codes to ensure safety and compliance.