What is the minimum diameter of a Class II copper air terminal?

The minimum diameter of a Class II copper air terminal being 1/2" is based on standardized requirements for effective lightning protection systems. Class II air terminals are specifically designed for applications that necessitate a high level of protection from lightning strikes.

A diameter of 1/2" ensures adequate conductivity and structural integrity, allowing the terminal to withstand the intense electrical and thermal effects of a lightning strike. Additionally, having a thicker terminal reduces the risk of melting or vaporization during a lightning event, ensuring that the terminal can effectively carry the discharge safely into the grounding system. This specification is outlined in the relevant industry standards that govern the installation and performance expectations of lightning protection systems, aiming to enhance safety and reliability in the event of a lightning strike.