Under what condition can a Master Plumber with a COF service commercial buildings?

The assertion that a Master Plumber with a Certificate of Fitness (COF) cannot service commercial buildings is rooted in the specific regulations governing the qualifications necessary for servicing these structures. Typically, servicing commercial buildings often requires higher levels of expertise, adherence to more stringent codes, and possibly additional certifications or licensures that extend beyond what is required for handling residential systems.

Commercial buildings are subject to different codes and standards due to factors like their size, complexity, and the safety implications involved in their operation. A Master Plumber with only a COF might not possess the requisite knowledge or approval to manage the advanced systems often found in commercial properties, including intricate fire sprinkler systems, which have critical implications for safety and compliance with fire codes.

Thus, the statement accurately reflects the limitations placed on individuals regarding the servicing of commercial buildings without the necessary credentials or licensure tailored to that environment.