Electrically continuous structural steel may be used as a strike termination device or main lightning protection conductor if it is at least ? thick.

Using electrically continuous structural steel as a strike termination device or main lightning protection conductor is significant for ensuring an effective lightning protection system. The thickness requirement of at least 3/16" is important because it ensures that the structural steel can effectively carry the lightning current without exceeding its capacity, which could lead to melting or damage during a strike.

Structural steel that meets this thickness requirement can provide durability and sufficient strength to withstand the intense energy of a lightning strike. A thickness of 3/16" strikes a balance; it's robust enough to ensure conductivity while still being practical in terms of fabrication and installation. Thinner materials might not handle the expected lightning currents safely, leading to potential failures in the system. This ensures a reliable path to ground for the lightning current, thereby protecting the structure and its occupants from the harmful effects of lightning strikes.