What does WLL stand for, and how is it used in selecting rigging gear?

• A. Working Load Limit; it is the maximum load the gear is designed to lift safely, used to select compatible equipment and determine safe practice.
• B. Working Load Level; it indicates the maximum speed of lifting gear.
• C. Weight Load Limit; it measures load weight.
• D. Working Load Limit; it is used to calculate lift height.

Answer: (A)

WLL stands for Working Load Limit: the maximum load the rigging gear is designed to lift safely when used as rated by the manufacturer. This rating is the key you use when selecting equipment because you must ensure every component in the rigging setup can handle the load you plan to lift.

In practice, you compare the actual load (and any dynamic or shock factors) to the WLL of each piece—slings, shackles, hooks, chains, and the rigging configuration itself. You choose gear whose WLL is greater than the expected load, often applying a safety margin to cover dynamic forces, angles, and the worst case in the lift. That means the whole system should have a combined capacity that exceeds the load, with each component rated appropriately.

WLL is about safe capacity, not speed, height, or exact weight measurements beyond indicating capacity. It’s also important to note that different standards may use terms like SWL, but the principle remains the same: use gear rated above the load to maintain safe practice.