How does a "two-block" condition occur?

A "two-block" condition occurs specifically when the upper block of a hoist comes into contact with the lower block. This situation is critical because it indicates that the hoist has reached the maximum allowable lift height, which can lead to severe damage, accidents, or even injuries if not addressed immediately. In a well-functioning rigging setup, there should always be a safe distance between these two blocks to ensure a smooth and safe operation.

Understanding the mechanics behind a two-block condition helps riggers recognize the importance of monitoring loads and lift heights to prevent such occurrences. Calls for attention to the rigging setup are warranted; however, the core issue here is the physical contact between the blocks themselves. This type of event highlights the risk of improper communication during lifting and the necessity for proper training and caution during rigging operations.