Which NFPA 72 section addresses public mode sound level requirements?

• A. 18.4.4.1
• B. 18.4.5.1
• C. 18.1.1
• D. 18.5.6

Answer: (A)

Public mode sound level requirements are the rules that ensure alarms heard by building occupants meet measurable audibility criteria. This section specifies the required sound levels for occupant notification appliances, including how loud the alarms must be in different ambient conditions and distances, so people can hear them clearly during an alarm and respond appropriately.

That’s why this section is the best answer: it directly defines the audible criteria for public mode, the mode used for occupants, rather than other topics in NFPA 72 such as private mode signals or general definitions and scope. The other sections cover different aspects of signaling or administrative aspects and do not address the occupant audible level requirements.