What is meant by the term "two blocking"?

The term "two blocking" refers specifically to the situation where the load block makes contact with the boom point sheaves. This condition typically occurs when the hoisting system is operated with insufficient rigging height or when the load is lifted excessively high. Two blocking is a dangerous scenario because it can lead to severe equipment damage and may compromise the stability and safety of the lift.

Understanding two blocking is crucial for riggers and crane operators, as it provides insight into the limits of the crane’s operation and the importance of following safe lifting procedures. The other options describe different scenarios that do not accurately capture the essence of two blocking, which specifically involves the interaction between the load block and the boom point sheaves. Proper training and awareness can help prevent two blocking incidents in crane operations.