Overview of Public Emergency Alarm Reporting
Chapter 27 of NFPA 72 addresses public emergency alarm reporting systems, which provide a means for the public and for protected premises fire alarm systems to transmit alarms directly to a public communications center, typically a fire department dispatch center. Historically, these systems have used municipal fire alarm box networks, though modern implementations may use various technologies including radio, telephone, and networked communications.
Public Alarm Boxes
Public fire alarm boxes are strategically located throughout a municipality to allow citizens to report emergencies. They must be conspicuously mounted, easily accessible, and identifiable by color (typically red) and signage. Box placement must consider population density, travel distance, and the needs of the community. Boxes may be manual (requiring a person to activate them) or automatic (connected to a building’s fire alarm system to transmit signals directly to the public communications center).
Communication Centers
The public communications center that receives alarm signals must meet strict requirements for reliability and staffing. Centers must be staffed at all times by trained operators, must have redundant power supplies and receiving equipment, and must maintain documented standard operating procedures. The center must be capable of dispatching the appropriate emergency response based on the type and location of the alarm signal received.
System Reliability and Technology
Public emergency alarm reporting systems must maintain high reliability because they serve as a critical link in the emergency response chain. Wired networks must be electrically supervised to detect faults. Wireless and IP-based networks must provide equivalent levels of reliability and must be monitored for integrity. Redundant communication paths and backup power are required to ensure that the system remains operational during power outages, equipment failures, or adverse conditions.
