How should the distance of an air terminal be configured to ensure proper lightning protection?

The ideal configuration of the distance of an air terminal for effective lightning protection is to position it above the structure it protects. This ensures that the air terminal can intercept lightning strikes before they reach the structure, directing the electrical energy safely down to the ground through a grounding system.

By having the terminal elevated, its height can create a protective zone around the building, allowing for better dispersion of the electrical discharge. This setup minimizes the potential for lightning to strike the building itself, which is crucial in preventing damage and ensuring safety.

Positioning the air terminal close to the structure, at ground level, or at the same level as the roof line would not provide the necessary elevation to effectively divert lightning strikes. This could lead to increased vulnerability for the structure being protected, therefore compromising its safety features during a lightning event.