When lifting from the main boom with the jib extension, what must be done with the effective jib weight?

When lifting from the main boom with a jib extension, the effective jib weight must be deducted from the gross capacity of the crane. This is because the jib extension adds additional weight that the crane must be able to support. In order to maintain safety and operational efficiency, it is essential to account for the weight of the jib effectively as it reduces the overall lifting capacity available for the load being lifted.

The gross capacity represents the maximum weight the crane can lift without being compromised. By deducting the effective jib weight, you ensure that the crane operates within its safe limits and that the total weight being lifted—combining both the load and the jib—is within the crane's operational capacity.

This concept aligns with safe lifting practices where the total weight that the crane handles includes both the load and any additional attachments or accessories, such as a jib. It reinforces the importance of proper calculations in crane operations to prevent overloading and potential accidents.