How far must guards extend horizontally from the edge of an open side?

The correct extension distance for guards from the edge of an open side is 30 inches. This requirement is based on safety regulations that are designed to prevent falls and accidents in areas where there is an unprotected edge. By extending guards horizontally a minimum of 30 inches, it creates a significant barrier that helps to safeguard individuals from falling over the edge, particularly in commercial building environments where heavy foot traffic or activity may occur near open sides.

The rationale behind the 30-inch requirement includes considerations of visibility and effectiveness in preventing accidental falls. This distance has been established to ensure that barriers are substantial enough to be noticeable and to serve their protective function effectively.

Other options, while they may seem feasible, do not meet the established safety standards for proper guard height and extension. Distances such as 3 inches, 12 inches, or 18 inches would not provide adequate protection and could easily allow individuals to fall over the edge if facing away from it or if the barrier is not sufficiently robust. In contrast, the 30-inch extension serves as a proven measure to enhance safety in commercial and construction settings.