When should workers use a personal fall arrest system?

The correct answer is that workers should use a personal fall arrest system when working on a scaffold 10 feet or higher. This is because regulations and safety standards dictate that at heights where a fall could occur, especially on scaffolding, it is crucial to implement fall protection measures to prevent serious injury or fatality.

Scaffolds elevate workers above the ground and increase the risk associated with falls. Having a personal fall arrest system in place provides a critical layer of safety, ensuring that if a fall were to occur, the worker would be safely caught and not fall to the ground. This requirement helps to mitigate the risks associated with working at height and is a standard safety protocol in many industries.

The other options do not align with the established safety standards concerning the use of personal fall arrest systems. For instance, using such systems only in confined spaces or only during training sessions does not address the primary concern of employee safety when working at heights. Similarly, stating that they should be used whenever working at any height does not take into account the specific regulatory guidelines that apply to particular situations, such as scaffolding. The focus on the 10-foot threshold for scaffolding provides a standard that helps ensure worker safety in environments with a higher likelihood of fall hazards.