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

With the hook in the extreme low position, how many wraps must remain on the load hoist drum?

1. 1 wrap

2. 2 wraps

3. 3 wraps

4. 4 wraps

The correct answer is: 2 wraps

When the hook is in the extreme low position, it is essential to maintain a minimum number of wraps of wire rope on the load hoist drum to ensure safe operation and prevent the chance of the rope accidentally slipping off the drum. The requirement for having at least two wraps left on the drum helps to maintain the integrity of the lifting system and provides a secure attachment to the load being lifted. This practice is crucial because if too few wraps are left, there's a higher risk of the rope being dislodged due to sudden movements, load shifts, or wind conditions. By ensuring that at least two wraps remain, the operator can safeguard against these risks and ensure that the hoist system remains stable and secure while lifting or lowering loads. This approach also helps distribute the load evenly across the remaining wraps, reducing potential damage to the wire rope and the hoist equipment itself. Overall, adhering to this requirement is vital for safe crane operations and aligns with best practices in crane safety protocols.