What is the conductivity of copper materials designed for lightning protection when annealed?

The conductivity of copper materials designed for lightning protection, particularly when annealed, is typically around 100% IACS (International Annealed Copper Standard). This means that these materials can carry electrical current with minimal resistance, which is essential in lightning protection systems. When copper is annealed, it undergoes a heat treatment process that enhances its electrical conductivity by relieving stress and optimizing its crystalline structure.

This high level of conductivity is crucial because lightning protection systems depend on materials that can quickly and effectively conduct the high electrical charges associated with lightning strikes away from structures. Using materials that are at or near 100% conductivity ensures that the system will function optimally during a lightning event, providing the necessary safety and protection to buildings and their occupants.