What type of wiring is prohibited in damp locations according to NEC guidelines?

In accordance with NEC (National Electrical Code) guidelines, open wiring is prohibited in damp locations due to its vulnerability to moisture. Open wiring refers to the method of running conductors without any type of protective covering or conduit, leaving them exposed. This type of installation poses a significant safety risk in damp environments because moisture can lead to corrosion, short circuits, and increased chances of electrical shock.

Damp locations require wiring to be protected against moisture intrusion, which is where more suitable wiring methods, such as those involving non-metallic sheathed cable or sheathed cables like Romex, come into play. These cables typically have an insulation layer that provides a protective barrier against moisture and environmental factors, thus maintaining electrical safety and system integrity in these areas. Hence, the guidelines clearly prohibit open wiring in damp locations to prevent the associated risks.