National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

When hoisting personnel, within what percentage of level must a telescopic boom crane be in order for the gross ratings in the load chart to remain valid?

1. 1%

2. 2%

3. 5%

4. 8%

The correct answer is: 1%

When hoisting personnel with a telescopic boom crane, it is essential that the crane remains within a specific level tolerance to ensure safety and maintain the validity of the load chart's gross ratings. In this case, the requirement is that the crane must be within 1% of level. This stringent requirement helps ensure stability and minimizes the risk of tipping or losing control of the load. Operating outside of this percentage can lead to an increase in the effective load on the crane's rigging and structure due to gravity acting on a sloped surface, potentially compromising safety and the crane's rated capacities. The load chart is specifically designed based on certain conditions, and adhering to this 1% tolerance ensures those conditions are met, allowing for safe personnel lifting operations. Other options represent higher tolerances, which do not align with established safety standards for personnel hoisting. A lower tolerance like 1% is necessary to ensure the utmost safety, reflecting industry best practices.