What type of wire is required for outdoor installations?

For outdoor installations, UF (Underground Feeder) cable or other rated waterproof types are specifically designed to withstand exposure to moisture and adverse weather conditions, making them ideal for outdoor use. UF cable has a robust and durable insulation that is resistant to moisture, renowned for its capability to be buried directly in the ground without the need for additional conduit. This makes it suitable for both above-ground and underground applications.

Other types of cable, such as NM (Non-Metallic) cable, are intended for dry, indoor locations and lack the moisture-resistance required for outdoor settings. Similarly, while THHN wire is used in many applications, it also lacks the necessary insulation for direct exposure to water or soil unless placed in conduit. TF (Thermoplastic Flexible) cable, while flexible, does not meet the specific requirements for outdoor durability in the same way that UF cable does. Therefore, UF cable or similarly rated waterproof types are the correct choice for any outdoor electrical installation to ensure safety and compliance with electrical codes.