Class II materials are typically used for structures that exceed what height?

Class II materials are typically associated with structures that exceed 75 feet in height. This classification is crucial in lightning protection design, as it helps determine the appropriate level of protection needed for taller structures. As buildings increase in height, the potential for lightning strikes also increases, necessitating more robust materials and systems to safely manage and direct the energy from lightning strikes to the ground.

Using Class II materials for structures over this height helps ensure that the lightning protection system can effectively handle the energy involved and mitigate the risk of damage. It's important to implement suitable materials and installation practices as structures rise beyond 75 feet to adequately safeguard against lightning-related incidents.