What type of wiring is used for outdoor electrical installations?

UF (Underground Feeder) cable is specifically designed for outdoor electrical installations due to its robustness and resistance to moisture. This type of cable is suitable for underground use and can be directly buried in the ground without requiring additional protection, making it ideal for applications such as powering outdoor lights, garden equipment, or other outdoor electrical systems.

The insulation of UF cable is thicker compared to NM (Non-Metallic) cable, providing a greater level of protection against environmental factors, including water and soil acidity, which is essential for maintaining electrical safety and operational integrity in outdoor settings. Additionally, UF cable is rated for wet locations, which further supports its use in outdoor applications.

Other types of wiring, such as NM cable, are not designed for outdoor use because they lack the necessary moisture resistance and could pose safety risks if exposed to outdoor conditions. EMT, while providing a degree of protection, is typically used for indoor applications and does not provide the same level of moisture resistance as UF cable. THHN wire is used in various applications but also requires additional protection for outdoor installations as it is not rated for direct burial or exposure to moisture without conduit.