If a jib is erected but not actively used, how is it treated in relation to the crane's capacity?

When a jib is erected but not actively used, it is treated as a deduction from the crane's gross capacity. This is because the jib adds weight and structural considerations that effectively reduce the crane's overall lifting capability. The jib, although not being used for lifting at that moment, still contributes to the overall configuration and balance of the crane, which must be taken into account when determining how much weight the crane can safely lift.

The presence of the jib may alter the center of gravity and affect stability, which is essential for safe crane operation. Since the crane's specifications for lifting capacity are based on specific configurations, the static load of the jib means that the crane cannot operate at its maximum rated capacity if that jib is attached, even if it is not in active use. Thus, treating it as a deduction ensures that the crane operates within safe and recommended limits.