Lightning Protection Level 1 Practice Test 2026 – Complete Exam Preparation

The correct distance for positioning air terminals from the outside corner or edge of the object they are protecting is 24 inches. This distance is significant in lightning protection systems because it minimizes the risk of side flash, which can occur when lightning strikes nearby and travels along the surface of an object before using it as a path to ground. By placing the air terminals at a minimum of 24 inches from the corner, the design effectively reduces the area where lightning might arc or bypass the protection system. Ensuring this distance contributes to the overall effectiveness of the lightning protection system in safeguarding the structure and its occupants from the dangers associated with lightning strikes.