What is the center of gravity and why is it critical in rigging?

• A. The point where the load’s weight is considered to act; knowing CG prevents tipping and ensures proper sling placement.
• B. The point where the crane attaches to the load.
• C. The center of the lifting device.
• D. The exact weight of the load.

Answer: (A)

Center of gravity is the single point where the load’s weight can be considered to act. In rigging, knowing where that point lies tells you how the load will balance when you lift it. Lifting at or near the center of gravity helps keep the load stable and vertical, with forces on the slings and hook more evenly distributed. If the center of gravity isn’t aligned with your rigging setup, the load can tilt, swing, or rotate, creating uneven sling tensions, side loading on the hook, or even tipping hazards. The exact location of the center of gravity depends on how weight is distributed inside the load and any attached hardware, and it can shift as the load changes. That’s why assessing and aligning the lift with the CG is essential for a safe, controlled lift.