Which class of materials is used for buildings exceeding 75 feet in height?

The correct answer is Class II materials. In the context of lightning protection for tall structures, buildings that exceed 75 feet in height require specific materials to ensure adequate protection against lightning strikes. Class II materials are designed to provide a higher level of performance and reliability in lightning protection systems, meeting the critical demands posed by such tall structures.

These materials are typically characterized by their durability, electrical conductivity, and ability to withstand the high currents associated with lightning strikes. This makes them suitable for installations in taller buildings where the risks and potential damage from a lightning strike are significantly greater compared to shorter structures. Class I materials, on the other hand, are not rated for such high protective capability, and Class III materials generally offer even lower standards of performance. Conventional materials may also lack the enhanced features needed in this scenario. Thus, the selection of Class II materials is a crucial consideration for effectively protecting taller buildings from lightning-related hazards.