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

The correct answer indicates that self-supporting extra-heavy-duty type IA metal portable ladders are designed to support a weight of at least three times the maximum intended load. This standard is established to ensure the safety and structural integrity of the ladders during use, as they may experience dynamic forces that can exceed typical static loads. By requiring this substantial safety factor, the regulations account for various factors such as potential unforeseen loads, usage conditions, and the durability of the materials used in the ladder’s construction.

This is particularly important for heavy-duty applications where ladders might be subjected to rigorous use in construction and maintenance work. Ladders in the type IA category are typically rated for a maximum intended load of 300 pounds. Therefore, supporting three times that amount means the ladder should safely bear at least 900 pounds under ideal conditions, thus giving workers confidence in their safety when using these ladders. The other figures listed in the answer choices represent higher safety factors that don’t align with the specified requirements for type IA ladders, highlighting the importance of understanding the specific ratings and definitions outlined in safety standards for equipment.