What standard is used for the installation of sprinkler systems in 1/2 family dwellings and manufactured homes?

The correct choice is NFPA 13D, which specifically addresses the installation of sprinkler systems in one- and two-family dwellings as well as manufactured homes. This standard outlines the requirements and guidelines for residential sprinkler systems designed to provide life safety protection for occupants in these types of structures.

NFPA 13D is particularly important because it creates a simplified approach suited to the unique characteristics and needs of residential buildings. It covers aspects such as system design, installation procedures, and maintenance, ensuring that the systems installed are effective and reliable for protecting against fire hazards in a household environment.

Other options such as NFPA 13R are tailored for residential occupancies that are more complex, like apartment buildings. NFPA 20 focuses on the installation of stationary pumps for fire protection, which would not apply directly to residential sprinkler systems. NFPA 780 pertains to the installation of lightning protection systems, which is outside the realm of fire sprinkler system standards. Therefore, NFPA 13D is the appropriate standard for the specified application.