Which NFPA standard is focused on water mist fire protection systems?

The focus on water mist fire protection systems is specifically addressed in NFPA 750. This standard outlines requirements for the design, installation, and maintenance of water mist systems, which use fine water droplets to control and extinguish fires effectively. NFPA 750 provides detailed guidance on system components, performance criteria, and testing methods, ensuring that water mist systems function safely and efficiently to protect lives and property from fire hazards.

In contrast, the other options address different topics: NFPA 780 pertains to the installation of lightning protection systems, NFPA 760 covers the requirements for the installation and service of fire alarm systems, and NFPA 700 is not a recognized standard in the context of fire protection systems. Thus, NFPA 750 is the correct standard relevant to water mist fire protection systems.