What is the requirement for outdoor wiring regarding protection against moisture?

Outdoor wiring must be protected against moisture due to the potential for exposure to rain, snow, and other environmental conditions. Wiring that is specifically listed for wet locations is designed to withstand such conditions without sacrificing safety or integrity. This means that the materials used in the wiring and its insulation are resistant to water ingress, which is crucial for preventing short circuits, electrical hazards, and damage to the wiring itself.

Wires rated for wet locations are subject to rigorous testing and standards to ensure they perform safely and effectively under wet conditions. Using wiring that meets these specific requirements helps to maintain electrical reliability and safety in outdoor installations.

In contrast, wiring rated for dry locations does not have the necessary protective qualities for outdoor use, installations above ground do not inherently ensure protection from moisture, and simply insulating wires with special coatings does not guarantee suitability for wet environments without specific listings and standards.