How high must a wall-mounted visual signaling appliance be installed in public mode?

The correct answer indicates that a wall-mounted visual signaling appliance must be installed at a height of 80 inches to 96 inches when in public mode, adhering to the guidelines set forth by the National Fire Protection Association (NFPA) standards, specifically NFPA 72, which governs the installation of fire alarm systems.

This height range is established to ensure that the visual signaling appliances are clearly visible to all occupants in a building, including those who may be seated or standing. The specified height range also helps to prevent obstructions by furniture or other structures, ensuring that the notification devices can effectively alert individuals in case of an emergency.

While there are other height options mentioned, they do not align with the established standards for mounting visual signaling appliances in public settings, making them unsuitable choices. Factors such as accessibility, visibility, and compliance with safety codes are paramount in positioning these devices appropriately, and option B strikes the right balance in meeting those crucial requirements.