What is the net capacity determined by?

Net capacity is determined by the manufacturer's load ratings minus any capacity deductions that are necessary due to various factors, such as the need to account for the weight of rigging, potential dynamic forces, or other load impairments. This process ensures a more accurate measure of the effective lifting capability of the crane, taking into consideration real-world conditions and safety factors.

The manufacturer's load ratings provide a baseline or guideline for the crane's capabilities under ideal circumstances. However, the actual load that can be safely lifted will often be less than this rating when deductions for attachments, rigging, and other variables are applied. This understanding is crucial for operators to ensure safety and efficiency in crane operations.

The other options do not accurately reflect how net capacity is calculated. While rated capacities and gross capacities provide useful information, they do not factor in the necessary deductions that can affect the true lifting capability in practical scenarios. Additionally, considering only the weight of the load in isolation does not provide a complete picture of the crane's operational limitations.