For structures taller than 60 feet, within what distance must all grounded media be interconnected?

For structures taller than 60 feet, the requirement is to interconnect all grounded media within a distance of 12 feet. This standard is critical for ensuring that all parts of the structure maintain an equal potential during a lightning event, which helps to mitigate the risk of side flashes and other dangerous electrical phenomena. Interconnecting grounded media in this manner facilitates effective grounding, providing a low-resistance path for lightning currents to travel to the ground, thus protecting both the structure and its occupants.

The specified distance stems from established safety standards that aim to maintain the integrity of the grounding system. By adhering to the 12-foot interconnection rule, the risk of creating potentially dangerous voltage differences between various grounded parts of the structure is significantly reduced, which is essential in the design of effective lightning protection systems.