Which factor is crucial when calculating the load on a rigging line?

The angle of the sling or line tying into the load is crucial when calculating the load on a rigging line because it directly impacts the distribution of force within the rigging system. When a load is lifted using slings or lines, the angle at which these slings are positioned influences the total load experienced by each sling or line segment.

A shallower angle increases the tension in the rigging lines, leading to higher forces being applied than the actual weight of the load. Conversely, a steeper angle can reduce the tension in the lines, but may also lead to other complications, such as stability issues. The loading on each component of the rigging system must be carefully assessed to ensure safety and prevent equipment failure.

While the weight of the equipment and other factors like height and material type are important for overall safety and rigging calculations, the angle of the sling is the most significant in determining the immediate forces that act on the rigging lines during the lift.