Which of the following scaffolds requires a personal fall arrest system and guardrail system for occupational safety?

Single-point or two-point adjustable suspension scaffolds require a personal fall arrest system and guardrail system due to the nature of their design and use. These types of scaffolds are typically suspended from cranes or other overhead structures and are often used in applications where workers need to perform tasks at different heights, such as window washing or maintenance.

The need for a personal fall arrest system is essential because workers on adjustable suspension scaffolds are at a significant height and are exposed to the risk of falling. A personal fall arrest system helps protect workers in the event of a fall. Additionally, incorporating guardrails further enhances safety by providing an additional barrier against falls.

Other types of scaffolds may have different safety requirements based on their structural characteristics, setup, and intended use. For instance, supported scaffolds, which are built from the ground up and rely on their structure for stability, may not necessarily require the same level of fall protection since they can often be designed with guardrails. Similarly, mobile and catenary scaffolds may have different arrangements and safety measures appropriate to their specific use cases.