What tensile strength must light use pulleys withstand without load failure?

The tensile strength required for light-use pulleys to avoid load failure is crucial for ensuring the safety and effectiveness of rope rescue operations. A tensile strength of 22 kN (kilonewtons) is suitable because it provides a good balance of strength versus weight for the operational demands placed on light-use pulleys. This strength ensures that the pulley can handle forces associated with various rescue scenarios, including the potential impact loads that might occur during a rescue operation.

In rescue applications, considerations include the maximum loads expected in real-world situations, which are often higher than the static load due to dynamic factors such as sudden movements or shifts in weight. Therefore, a rating of 22 kN is designed to accommodate those conditions comfortably, thereby ensuring both the safety of the rescuers and the effectiveness of the rescue efforts.

Other options may not provide sufficient strength or may be overly conservative, potentially limiting the equipment's usability in demanding situations. The 22 kN rating strikes a practical balance, ensuring that light-use pulleys can function safely under a range of expected conditions in technical rescue operations.