Which of the following components must be rated for the maximum system working pressure?

The selection of piping and fittings as components that must be rated for the maximum system working pressure aligns with safety standards outlined in NFPA 24. Both piping and fittings are integral to the overall integrity and functionality of the fire service main system.

Piping serves as the primary conduit for water flow, while fittings connect various sections of piping and facilitate direction changes and branching of the system. Ensuring that both components are rated to withstand the maximum system working pressure is essential because any failure due to inadequate pressure ratings can result in leaks, system failures, and ultimately jeopardize fire protection capabilities.

By specifying that piping and fittings must be appropriately rated, NFPA 24 emphasizes the importance of maintaining a robust and safe fire protection system, capable of functioning under the pressures experienced during a fire emergency. This requirement underscores the necessity for careful selection and installation practices to mitigate risks associated with water pressure fluctuations during operation.