What material is often used for outdoor electrical wiring due to its durability?

Aluminum is commonly used for outdoor electrical wiring primarily because of its excellent balance of low weight and high conductivity. This makes it particularly advantageous for overhead and outdoor installations, where weight savings can lead to decreased structural demands on poles and towers. Additionally, aluminum has a natural layer of oxidation that provides some resistance to corrosion, making it more durable in harsh environmental conditions compared to other materials.

While PVC is used in some outdoor applications for insulation and protection, it does not possess the conductivity required for wiring. Teflon, although it has exceptional heat resistance and chemical stability, is not typically suitable for general electrical wiring due to cost and conductivity factors. Steel, while durable, is heavier and can be prone to rust and corrosion if not properly coated or treated, making it less ideal than aluminum in many outdoor electrical applications.