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

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What applies to the capacities below the bold line shown on a load chart?

  1. They are based on the structural strength of the crane

  2. They must not be used

  3. They are based on the stability of the crane

  4. They should only be used if the crane is set up on outriggers

The correct answer is: They are based on the stability of the crane

The capacities below the bold line on a load chart represent the limits determined by the stability of the crane. This indicates that these capacities are specifically calculated based on the crane's ability to remain stable under load without tipping over. The bold line typically separates the areas of the load chart that are affected by structural strength from those limited by stability. When considering lifting operations, understanding which capacities are affected by stability is crucial for ensuring safe operation. If a crane operates above these stability limits, it may compromise the overall balance, leading to risks such as tipping, even if the crane's structure is technically capable of handling the weight. Thus, the guidance encapsulated by these capacities is vital for preventing instability during operation.

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