Which conductor type is best suited for outdoor use in both wet and dry locations?

The choice of Type SE (Service Entrance) conductors for outdoor use in both wet and dry locations is appropriate because these conductors are specifically designed to handle the environmental challenges associated with outdoor installations. Type SE conductors have a robust construction that includes a weather-resistant thermoplastic jacket, making them suitable for exposure to moisture and varying temperatures. They are often used for overhead service entrance wiring and in outdoor electrical applications where the wiring needs to be durable against elements like rain or snow.

In contrast, while other conductors may have specific strengths, they might not be as well-suited for wet conditions. For example, Type THHN is primarily designed for dry locations and may not provide adequate protection when exposed to moisture over time. Type AC (Armored Cable) is typically used for protected indoor applications, and while it offers some level of moisture resistance, it is not as effective as Type SE in outdoor settings. Type UF (Underground Feeder) is designed for direct burial but may not have the same capacity for overhead applications as Type SE, particularly in moist environments.

Overall, Type SE’s construction and properties make it a reliable choice for outdoor applications requiring durability and moisture resistance.