Working Load Limits (WLLs) are the measurement for strength in the cargo net and restraint industry. The maximum load of an item is measured through testing and then divided by a Safety Factor Ratio to determine the WLL. Maximum loads are the amount of weight or tension any item can endure before breaking. Maximum loads are also known as breaking strength or Break Strength Capacity (BSC) of an item.
Quarantine uses the same Safety Factor Ratio as the U.S. Cargo Control of 1/3 of the break strength or maximum load of an item, or 1/3 of the amount of load at which any component of the product broke when tested. Any detachable part on a restraint system must be marked independently with its specific WLL. Quarantine Restraints are comprised of more than one element, and the lowest WLL for each and every one determines the WLL of the entire group.