What is a requirement for ground clamps in a lightning protection system?

In a lightning protection system, ground clamps play a critical role in ensuring effective electrical connections to grounding systems. The requirement that ground clamps must have two bolts and make contact at 1-1/2" is essential for several reasons.

First, the use of two bolts ensures a secure and robust mechanical connection that can withstand the forces generated during a lightning strike. This dual-bolt configuration aids in distributing the load more evenly and minimizes the likelihood of the clamp loosening or becoming dislodged over time due to environmental factors or physical stress.

Second, the specification of making contact at 1-1/2" is important for ensuring proper surface area interaction between the clamp and the conductor. This contact distance maximizes the electrical conductivity between the clamp and the grounding system, ensuring that any lightning energy is effectively transmitted into the ground without resistance that could lead to a potential failure in the system.

Hence, meeting both of these criteria helps to maintain the integrity and reliability of the lightning protection system, ultimately enhancing safety.