What are the strength requirements for anchorages used with positioning device systems?

The strength requirements for anchorages used with positioning device systems are based on ensuring safety and durability during potential fall situations. The correct choice states that anchorages must be able to withstand 3000 pounds or twice the impact load of an employee fall. This standard is critical because it helps to ensure that the anchor can handle not just the static weight of the person using the system, but also the dynamic forces that occur during a fall.

When a person falls while using a positioning device, the impact can significantly exceed their body weight due to the rapid deceleration that takes place. The requirement to support twice the impact load provides a necessary safety buffer that reduces the risk of failure of the anchorage point. This precaution is essential in reducing the likelihood of severe injury or fatality in the event of a fall.

In contrast, the other options do not adequately address the need for safety under dynamic load conditions. Some suggest lower thresholds that may not provide sufficient protection against the forces experienced during an actual fall. Thus, the requirement of 3000 pounds or double the fall impact aligns with recognized safety practices, ensuring reliable performance of positioning systems in real-world situations.