Fall arrest equipment is necessary when working on elevated walkways or platforms that are:

The necessity of fall arrest equipment when working on elevated walkways or platforms is fundamentally linked to safety regulations and best practices designed to prevent falls and ensure worker protection. The correct answer highlights that fall protection is required based on the standards established by local law, which can vary by jurisdiction.

Local laws typically set specific height thresholds that, when exceeded, mandate the use of fall protection systems. By adhering to the regulations established in those laws, workers can ensure they are compliant and operating within safety parameters aimed at preventing accidents. This approach recognizes that the local legal framework is informed by regional risk factors, work environments, and safety conditions.

In contrast, specifying a height of at least 4 feet or more than 5 feet lacks specificity and might not align with local regulations that could dictate different heights. Similarly, stating requirements solely based on the presence of hazardous environments overlooks the critical role that statutory regulations play in establishing safety protocols. Following local laws effectively ensures that all workers are protected according to the most applicable and current safety standards.