What is the maximum height for air terminals used for lightning protection that necessitates special support requirements?

The maximum height for air terminals used for lightning protection that requires special support requirements is indeed 24 inches. When air terminals, often referred to as lightning rods, exceed this height, they necessitate additional structural support to ensure their stability and effectiveness. This height threshold is significant because it reflects both industry standards and safety practices established to manage the risks associated with lightning strikes.

When air terminals are taller than 24 inches, the potential for structural failure increases due to wind loads and other environmental factors. Therefore, implementing special support requirements becomes essential to maintain the integrity of the lightning protection system. Structures must be designed to safely bear these added loads, ensuring that the air terminals remain securely in place and perform their intended function of directing lightning strikes safely down to the ground.

Understanding this height limit is crucial for professionals involved in designing and installing lightning protection systems, as it directly influences their compliance with codes and safety standards.