Warning lines, used in warning line systems, shall be erected at least ? from the roof edge when no mechanical equipment is being used.

• A. 8 feet
• B. 6 feet
• C. 12 feet
• D. 4 feet

Answer: (B)

Warning lines create a visible boundary to keep workers away from the edge when there’s fall hazard and no protective mechanical equipment in place. Placing the line at least six feet from the roof edge provides a practical buffer, giving workers space to move and work without stepping into the hazard zone. This distance helps reduce the chance of a fall by enforcing a safe perimeter while tasks are performed. For the described scenario, the minimum distance is six feet. If mechanical equipment or other protective systems are used, the setup can differ, but with no mechanical protection, six feet is the required spacing.