Which of the following is essential to know when calculating load weight on a crane?

Understanding the safe working load limits is critical when calculating load weight on a crane, as it defines the maximum weight that the crane can safely lift without risking structural failure or instability. This concept ensures not only the safety of the operation but also the protection of personnel involved and the equipment being used. By adhering to the safe working load limits, operators can prevent accidents caused by overloading, which can lead to tipping or other hazardous failures.

The other options, while related to crane operation, do not directly address the necessary calculations for load weight. For example, the net capacity of the crane reflects its lifting capabilities but does not specifically indicate the safe load limit that factors in various conditions. Gross truck weight pertains to the overall weight of the vehicle but does not specifically inform load calculations for cranes. The operator's weight is not relevant to the lifting capacity of the crane itself when determining load weight. Therefore, knowing the safe working load limits is fundamental to ensuring safe and effective crane operation.