In a scenario involving a Mercantile Fire Alarm, which code is used?

• A. 3I
• B. 3MC
• C. 3R
• D. 6B

Answer: (B)

Codes for fire alarms are organized by the type of occupancy, so responders immediately know what kind of building they’re dealing with and what procedures to follow. For mercantile locations, the code that identifies this specific occupancy is 3MC. Here, the number 3 signals a fire alarm situation, and the letters MC stand for Mercantile, signaling a store/retail setting and the corresponding response. That alignment makes 3MC the correct choice because it directly maps to mercantile alarms, ensuring the right kind of dispatch and actions. The other options correspond to different occupancies—industrial, residential, or another category—so they wouldn’t indicate a mercantile fire alarm.