How many sprinklers can a master plumber with an S-12 COF maintain in residential occupancies?

The correct answer is based on the regulations governing the maintenance of fire protection systems by individuals with specific certifications. A master plumber holding an S-12 Certificate of Fitness (COF) is authorized to maintain a specific number of sprinklers in residential occupancies, which is set at a maximum of 30. This limit is established to ensure that an individual can effectively manage the oversight and maintenance of the systems without compromising safety or quality.

Regulations are typically designed to ensure that fire protection systems are properly maintained and inspected to function correctly during emergencies. By capping the number of sprinklers that one individual can maintain, it helps to promote thorough attention to each system and enhances reliability in residential environments, where fire safety is crucial.

While other options represent higher numbers, the limit of 30 aligns with safety and regulatory compliance standards set by fire safety authorities. Understanding these limits is essential for professionals working within fire protection fields, as it directly relates to the effectiveness of fire safety measures in residential settings.