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

The reduction of gross capacity in a multi-crane lift is typically how much?

1. 10%

2. 15%

3. 20%

4. 25%

The correct answer is: 25%

In a multi-crane lift scenario, the gross capacity of a crane is typically reduced to account for several factors, such as the dynamics of the load, potential swinging or tilting, and the increased risk of instability when multiple cranes are operating in tandem. A common industry standard is to reduce the gross capacity by about 25%. This percentage helps ensure a safer lift by allowing for a margin of error due to these dynamic factors. Furthermore, this reduction is in alignment with many manufacturers' recommendations and safety guidelines, which advise operators to consider the complexity and risks associated with lifting heavy loads using multiple cranes.