The top edge height of top guard rails on supported scaffolds manufactured or placed in service after January 1, 2000 shall be installed between ___ and ____ inches above the platform surface.

The correct response indicates that the top edge height of top guard rails on supported scaffolds manufactured or placed in service after January 1, 2000 must be installed between 38 and 48 inches above the platform surface. This specific range is established by safety regulations to ensure adequate protection for workers on scaffolds, helping to prevent falls, which are one of the leading causes of injury in the construction industry.

The requirement for the height of guard rails is strategically designed to provide a balance between accessibility and safety. Heights below 38 inches may not effectively prevent workers from falling, while heights above 48 inches could potentially create challenges in using the guardrails for safe access or movement. Thus, the 38 to 48-inch standard reflects the need for both protection and practicality in accessing work surfaces.

Understanding this height standard is crucial for compliance with OSHA regulations and for ensuring workplace safety on construction sites using scaffolding.