What is the effect of using an incorrect D/d ratio in rigging?

Using an incorrect D/d ratio, which refers to the diameter of the lift line (D) to the diameter of the rigging hardware (d), can significantly compromise the safety and integrity of the rigging setup. When the D/d ratio is not appropriate, it can lead to an uneven distribution of forces and increased stress on the rigging components. This increased stress can create conditions that may cause the sling to fail under load, resulting in potential accidents or injuries.

A correct D/d ratio ensures that the rigging is able to handle the loads safely without overstressing any component. Therefore, if the ratio is too low or too high, it could mean the sling is unable to perform as required, leading to a higher likelihood of sling failure. This emphasizes the importance of understanding and applying the correct D/d ratio in rigging practices to maintain safety during lifting operations.