Which statement about sprinkler listing requirements is true?

• A. They must be listed by a recognized listing agency
• B. Listing is optional
• C. They must be kept away from listing agencies
• D. They do not need to be listed for residential systems

Answer: (A)

Sprinklers must be listed by a recognized listing agency because listing confirms the device has been tested and evaluated for use in the intended fire protection system. A listed sprinkler carries marks from a recognized laboratory (such as UL or other NFPA-recognized agencies) that prove its design, materials, construction, and performance meet applicable standards. For NFPA 13R residential low-rise systems, the AHJ requires the sprinklers to be listed for residential use and for the specific application, ensuring the sprinkler will perform as intended when connected to the system’s water supply and piping configuration.

Listing is not optional; unlisted sprinklers do not meet code requirements. The idea of keeping sprinklers away from listing agencies is incorrect, since the whole purpose of listing is to verify suitability and reliability. And residential systems do require listed sprinklers, so saying they do not need listing also misstates the standard.