What is the primary cause of two-blocking during lifting operations?

The primary cause of two-blocking during lifting operations is hoisting the load too high. When the load is lifted excessively beyond the intended height, it can cause the hook to come into direct contact with the block or the crane structure. This situation can lead to significant stress on the rigging equipment and cause the load to become unstable, potentially resulting in an unsafe situation. Two-blocking not only risks damaging the equipment but also poses serious safety hazards to operators and bystanders. Proper lift height management is essential to maintain safe operating practices during material handling.