What is the minimum height for guards mounted above a roof-mounted equipment platform for service?

The correct minimum height for guards mounted above a roof-mounted equipment platform for service is 42 inches. This height requirement aligns with safety regulations aimed at preventing falls and providing a safe working environment for technicians who are servicing equipment on rooftops.

A guard height of 42 inches is designed to effectively mitigate the risk of falling from elevated surfaces, which is especially important given the nature of rooftop work, where heights can pose significant hazards. This standard is commonly referenced in OSHA regulations and other safety guidelines, making it vital for compliance and the protection of individuals working at such heights.

The other height options, while varying in their application, do not meet the established safety regulations for guardrails in these contexts, underscoring the importance of adhering to the 42-inch standard to ensure worker safety in maintenance and service tasks on roof-mounted equipment platforms.