What does the term "Class I" materials refer to in lightning protection?

The term "Class I" materials in lightning protection refers specifically to equipment designed for ordinary structures that are 75 feet in height or lower. This classification takes into account the varying levels of risk associated with different building heights, as structures above this height are typically exposed to higher levels of lightning strike risk and therefore may require different standards and equipment.

Understanding that "Class I" pertains to ordinary structures helps illuminate the criteria set forth in lightning protection, where materials and systems must be capable of effectively safeguarding buildings within this specified height range. This classification is crucial for ensuring that adequate protection is provided without over-engineering for lower-risk structures.

The distinction between "Class I" and other categories, such as those for taller or specialized buildings, emphasizes the tailored approach required in lightning protection systems depending on the structure’s characteristics and height.