If a jib is erected but not being used, it is treated as a deduction from the crane's?

When a jib is erected but not in use, it significantly affects the crane's operational parameters. Specifically, the correct response relates to the crane's gross capacity. Gross capacity refers to the maximum weight a crane can lift, comprising its lifting capabilities under ideal conditions without taking into account the additional load factors such as attachments or configurations.

An erected jib adds weight and presents a potential instability risk to the crane, which is why it is considered a deduction from the gross capacity. When a jib is not in use, it still occupies space and contributes to the overall weight that the crane structure must support, thereby reducing its effective lifting capability.

In contrast, net capacity usually refers to the lifting capacity of the crane minus any deductions due to configuration, and operating weight refers to the weight of the crane including all attachments. Total lift capacity, while a broader term, nonetheless would still encompass the impact of an erected jib as part of the gross capacity assessment. Understanding this distinction helps crane operators and operators to safely calculate lifting operations, ensuring safety and compliance with operational limits.