What key factor affects the tension in crane rigging during lifts?

The angle of the spreader is crucial in determining the tension in crane rigging during lifts because it directly influences how the load is distributed among the rigging components. When the angle of the spreader changes, it alters the effective load that each rigging line experiences. A larger angle can lead to increased tension in the lines due to the geometric relationship between the load, the rigging, and the crane. This means that if the angle widens, the rigging lines bear more weight and stress, which can affect the safety and stability of the lift. Understanding this helps crane operators optimize rigging setups for safer lifts and ensures that the equipment is within its operational limits.