A combination burglary/fire alarm system listed for household use may be used in a small mercantile occupancy.

• A. True
• B. False
• C. Not specified
• D. Only with AHJ approval

Answer: (B)

Listings tell you where a system can be used. A combination burglary/fire alarm system that is listed for household use is designed and tested for residential environments, with components and performance appropriate for homes. A small mercantile occupancy, while relatively small, is still a commercial space and has different life-safety requirements, wiring standards, supervision needs, and device performance criteria. Using a household-listed system in a mercantile setting would not meet those commercial requirements and would violate the stated listing. AHJ approval cannot override the limits of the listing—the equipment is not permitted to be used outside its listed occupancy. For a mercantile space, you’d need equipment listed for commercial/mercantile use that complies with the applicable codes and standards.