Final answer:
A positioning device system must limit free-fall distance to no more than 24 inches to ensure worker safety by reducing the risk of injury.
Step-by-step explanation:
The question pertains to occupational health and safety, specifically the limitations of a positioning device system in terms of free-fall distance. A positioning device system must limit free-fall distance to no more than 24 inches. This requirement is designed to ensure the safety of workers by minimizing the potential distance they could fall, thereby reducing the risk of serious injury.