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

What is the net capacity of a crane on main boom unless the manufacturer states otherwise?

1. The capacity listed in the load chart minus the weight of the rigging and all attachments

2. The capacity listed in the load chart plus the weight of the rigging and all attachments

3. The capacity listed in the load chart minus the weight of the rigging and all attachments not in use

4. The capacity listed in the load chart minus the weight of the rigging alone

The correct answer is: The capacity listed in the load chart minus the weight of the rigging and all attachments

The net capacity of a crane on the main boom is determined by considering the capacity listed in the load chart and subtracting the weight of the rigging and all attachments that will be used during the lift. This approach ensures that the crane operates within its safe working limits, as the total weight being lifted must account for both the load and any additional equipment that could affect the crane’s stability and performance. In practice, when a crane operator assesses a lift, they must understand that the weight of the load alone is not the sole consideration. The rigging, which includes slings, hooks, and other attachments, adds weight that must be included in the total load calculation. Therefore, the accurate way to determine the actual lifting capacity available for a specific load is to start with the load chart capacity and subtract the weight of all rigging and attachments being utilized. This ensures safety and compliance with the operational guidelines set forth by the manufacturer.