How should you determine the load's center of gravity (CG)?

• A. Use load charts, rigging calculations, and manufacturer guidance to keep CG within safe limits.
• B. Estimate CG by eye.
• C. CG is not important if the load seems balanced.
• D. CG is determined by the color of cables.

Answer: (A)

Determining the load’s center of gravity is essential for planning a safe lift because the CG shows where the entire weight effectively acts and how that point relates to the rigging and crane. The safest approach is to use load charts, rigging calculations, and the manufacturer’s guidance for that specific load. Load charts provide the lifting capacities and acceptable CG positions for different rigging configurations, helping you stay within the crane and rigging limits. Rigging calculations account for how sling lengths, angles, multiple legs, and attachment points shift the effective CG and influence how much capacity you have and how the load will behave during the lift. Manufacturer guidance gives the exact attachment points and balance characteristics for the load, which can differ from a generic assumption.

Estimating by eye is unreliable because subtle weight distribution inside a load can move the CG well outside the part of the rigging that supports it, even when the load looks balanced. The color of cables has no bearing on CG, and CG remains important regardless of appearance. By relying on charts, calculations, and manufacturer guidance, you keep the CG within safe limits and reduce the risk of tipping, swinging, or overloading equipment.