Two-blocking occurs when the ball or block comes in contact with what?

Two-blocking occurs when the ball or block comes in contact with what?

• A. The Sheaves
• B. The Rope
• C. The Load
• D. The Boom

Answer: (A)

Two-blocking happens when the lower block (the ball or hook block) makes contact with the upper block’s sheaves. This creates a pinch point where the hoist rope can become jammed between the blocks, which can damage the rope and prevent proper movement, potentially leading to an uncontrolled lift or drop. It’s the specific interaction between the blocks and their pulleys that defines this hazard, not just any contact with the rope, load, or boom.

Two-blocking happens when the lower block (the ball or hook block) makes contact with the upper block’s sheaves. This creates a pinch point where the hoist rope can become jammed between the blocks, which can damage the rope and prevent proper movement, potentially leading to an uncontrolled lift or drop. It’s the specific interaction between the blocks and their pulleys that defines this hazard, not just any contact with the rope, load, or boom.