What is the minimum number of downleads required for any structure, regardless of size?

The minimum number of downleads required for any structure is two. This standard is established to ensure adequate grounding and provide redundancy in the lightning protection system.

Having at least two downleads allows for a more effective dissipation of the electrical surge from a lightning strike into the ground. This helps distribute the current more evenly, mitigating the risk of potential hotspots or failure in the system that could occur if only a single downlead is used.

Using two downleads also enhances the overall performance of the lightning protection system, as it provides alternative pathways for the lightning current to reach the ground. This design feature is crucial for maintaining safety and effectiveness, especially in larger structures or those at higher risk of lightning strikes. While some smaller structures may not strictly require more than one downlead, the two-downlead minimum is intended to provide a baseline for adequate protection in all cases.