What is the primary material used for the main conductor in a lightning protection system?

The primary material used for the main conductor in a lightning protection system is copper. This choice is favored due to copper's excellent electrical conductivity, which allows it to efficiently carry the high currents generated during a lightning strike. Additionally, copper is highly resistant to corrosion, which is crucial for maintaining the integrity and functionality of the lightning protection system over time.

While aluminum is also a conductive material and can be used in some lightning protection applications, it does not match the conductivity and durability of copper for this specific purpose. Steel, while strong, is not as conductive as copper and would not be the preferred choice for the main conductor. Silver, although the best conductor of electricity, is not typically used due to its high cost and susceptibility to tarnishing, which can impair its conductivity. Therefore, copper remains the standard and most reliable option for lightning protection systems.