What should the grounding connection from a lightning protection system be established?

The grounding connection from a lightning protection system is typically best established at diagonal corners of the structure. This method ensures that the grounding system is effective by providing a route for the lightning current to dissipate into the earth evenly across the structure. By placing connections at diagonal corners, it helps in minimizing potential differences in case of a lightning strike, reducing the risks of side flashes and additional damage to the building.

This grounding strategy takes advantage of the principles of equal potential, ensuring that various sections of the structure have a lower risk in case of an electrical surge. It’s particularly important for larger buildings, where placing grounding connections in corners can effectively protect the entire structure from lightning strikes.

Other options may not provide the same level of effectiveness. For example, having a connection only near the power supply entrance may not adequately protect the entire building, particularly if the lightning strike occurs at a different location. Similarly, grounding along the perimeter or only on the roof may leave parts of the structure vulnerable, as they do not provide as comprehensive coverage or protection as the diagonal corner system.