Which NFPA standard is related to sprinkler systems in one- and two-family dwellings?

The correct choice is associated with NFPA 13D, which specifically addresses the installation of sprinkler systems in one- and two-family dwellings. This standard provides guidelines for the design and installation of automatic sprinkler systems that help ensure fire safety in residential settings. By focusing on smaller structures, NFPA 13D aims to balance fire safety needs with practical considerations, such as cost and simplicity, making it suitable for homes.

NFPA 13R, although related to residential sprinklers, applies to larger residential buildings such as townhouses and small apartment buildings, which makes it less relevant to the specific context of one- and two-family dwellings. NFPA 25 deals with the inspection, testing, and maintenance of water-based fire protection systems, rather than the initial installation guidelines for residential sprinklers. Lastly, NFPA 72 pertains to fire alarm systems and does not cover sprinkler systems at all. Therefore, NFPA 13D is the most appropriate standard for addressing the requirements for sprinkler systems in one- and two-family dwellings.