A master plumber with a COF is limited to residential occupancies with how many sprinkler heads or less?

The correct answer indicates that a master plumber with a Certificate of Fitness (COF) is authorized to install sprinkler systems in residential occupancies that have 30 sprinkler heads or fewer. This limitation ensures that the scope of work remains manageable and that the plumber has the necessary skills and knowledge to effectively handle systems of this size without undue risk to safety or code compliance.

In residential settings, having a specific limit on the number of sprinkler heads allows for regulation of who can perform certain installations based on their certification level. The goal is to maintain quality control and ensure that systems are installed correctly to meet safety standards.

Therefore, the criteria set by the regulations reflect a balance between allowing qualified professionals to work within their expertise while ensuring that larger, more complex systems are handled by those with broader qualifications and experience in commercial or larger residential fire protection systems.