What is the primary function of an air terminal in a lightning protection system?

The primary function of an air terminal in a lightning protection system is to intercept a lightning stroke. Air terminals, also commonly referred to as lightning rods, are strategically placed on a structure to capture the electrical energy from a lightning strike. Once the lightning strike is intercepted, the air terminal provides a controlled path for the electrical discharge to travel safely to the ground through the system of down conductors and grounding electrode systems.

By ensuring that the energy from a lightning strike is directed away from the building and its occupants, air terminals play a critical role in reducing the risk of fire, damage to the structure, and injury to individuals. Their design and placement are essential in maximizing the effectiveness of the lightning protection system, ensuring that it functions as intended during a lightning event.