NFPA 72 requires that visual and audible signals should not confuse those who are hearing or visually impaired.

NFPA 72 requires that visual and audible signals should not confuse those who are hearing or visually impaired.

• A. Signals must be synchronized.
• B. Audible alarms must be silenced only during maintenance.
• C. Visual and audible signals should not confuse those who are hearing or visually impaired.
• D. Signals must be loud enough to be heard over ambient noise.

Answer: (C)

This is about making fire alarm signals accessible and unambiguous for occupants who rely on different senses. NFPA 72 aims to ensure that the combination of visual and audible alerts conveys the same clear message, so someone with a hearing impairment can interpret the warning from the visual cues, while someone with a visual impairment can rely on the audible cues, and both groups aren’t presented with conflicting information. In practice, this means coordinating the signals so they are consistent, identifiable, and recognizable as the same alarm event across modalities, with appropriate visibility for strobes and intelligibility for horns and bells in typical environments. The idea is not to produce confusion or mixed messages among those who depend on different senses, which is why this statement is the best fit. Other choices address different aspects of signaling—synchronization, maintenance procedures, or merely being loud enough—that don’t directly capture the requirement to avoid confusing signals for hearing- or visually-impaired occupants.

This is about making fire alarm signals accessible and unambiguous for occupants who rely on different senses. NFPA 72 aims to ensure that the combination of visual and audible alerts conveys the same clear message, so someone with a hearing impairment can interpret the warning from the visual cues, while someone with a visual impairment can rely on the audible cues, and both groups aren’t presented with conflicting information. In practice, this means coordinating the signals so they are consistent, identifiable, and recognizable as the same alarm event across modalities, with appropriate visibility for strobes and intelligibility for horns and bells in typical environments. The idea is not to produce confusion or mixed messages among those who depend on different senses, which is why this statement is the best fit. Other choices address different aspects of signaling—synchronization, maintenance procedures, or merely being loud enough—that don’t directly capture the requirement to avoid confusing signals for hearing- or visually-impaired occupants.