Construction Supervisor License Practice Exam 2025 – All-in-One Study Guide for Exam Success!

The correct answer indicates that the required top height of top rails used in guard rail systems is 42 inches, with a permissible variation of plus or minus 3 inches. This standard aligns with OSHA regulations, which are designed to ensure the safety of workers by minimizing the risk of falls from elevated surfaces.

Guard rails are crucial safety features on construction sites, especially in areas where workers are exposed to open edges or sides. By establishing a specific height for the top rail, OSHA aims to create a consistent safety standard that helps prevent accidents. The allowance of a variance of 3 inches accounts for slight variations in installation and manufacturing, ensuring that the rails can still offer adequate protection even with minor discrepancies in height.

Understanding these specifications is critical for construction supervisors, as compliance with OSHA standards is mandatory for workplace safety and can also affect liability in case of accidents.