Which of the following is NOT part of a fall arrest system according to OSHA?

A fall arrest system is designed to safely stop a worker from falling when working at heights. According to OSHA (Occupational Safety and Health Administration) standards, such systems typically include components that are directly involved in connecting a worker to a secure anchor point and preventing injury during a fall.

Lanyards and snap hooks are essential parts of a fall arrest system. Lanyards connect the worker's harness to an anchor point, while snap hooks are used to securely attach the lanyard to both the harness and the anchor. These components are critical for ensuring that, in the event of a fall, the worker is safely stopped before hitting the ground.

Aerial lifts may be equipment used to reach elevated work areas, and they can come with built-in safety measures; however, they do not constitute part of a fall arrest system. Guardrails serve as a form of fall prevention by providing a physical barrier that helps keep workers from falling off edges or platforms but are not classified as part of a fall arrest system. This means that while guardrails are an important safety feature in construction and other industries, they do not function in the same context as lanyards and snap hooks in stopping a fall once it has occurred.

Therefore, guardrails stand apart as a