What is one characteristic of the required Class I aluminum main lightning conductor?

The characteristic of a Class I aluminum main lightning conductor that stands out is its specific weight requirement, which is 95 pounds per 1,000 feet of length. This specification is critical for ensuring that the conductor has enough mass and conductivity to effectively carry the lightning current without damaging the infrastructure it protects. The heavier weight contributes to better performance in terms of electrical conductivity and characteristics necessary for grounding purposes.

Having a defined weight also plays a crucial role in installation practices and the overall reliability of the lightning protection system. It ensures that the conductor is robust enough to withstand the thermal and mechanical stresses encountered during a lightning strike, thus safeguarding the integrity of the entire system. The other options do not provide the precise technical requirements stipulated for Class I conductors, making the correct answer the one that aligns with the established specifications for this type of lightning protection component.