Which certificate category applies to a one- or two-family dwelling sprinkler system?

• A. General
• B. Underground
• C. Dwelling
• D. Commercial

Answer: (C)

Certificate categories define the scope of work a licensed sprinkler contractor may perform. A one- or two-family dwelling sprinkler system is a residential installation, so it falls under the dwelling category. This category is specifically for residential buildings and the interior fire sprinkler work typical of homes (often aligned with standards like NFPA 13D). It limits the license to residential systems and excludes commercial-scale projects or broader multi-use installations. The underground category would apply to piping installed underground or exterior work, which isn’t the focus for a standard dwelling interior system, and the commercial/general categories cover non-residential or broader scopes. Therefore, the dwelling category is the best fit.