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Runner service is a service required for Proprietary Supervising Station and Central Supervising Station Fire Alarm Systems.
NFPA 72 currently recognized four methods of communication from the protected premises to the supervising station for fire alarm systems.
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Article 760.3 (Other Articles) identifies other sections of NFPA 70 that also apply to fire alarm systems.
While the Point 7 Rule can be mathematically calculated for heat detectors and applied to rectangular area and corridor applications, thankfully, the math has already been done for us in NFPA 72.
NFPA 72 requires that all points on the ceiling have a detector within a distance of 0.7 times the listed spacing of the detector.
Code Question – Is there language in the code that specifically prohibits blocking a fire alarm device (like a horn/strobe or pull station) with a bookcase?
When a ceiling surface has solid projection more than 4 inches, the distance between the projections center to center determines whether the projection is a joist or beam.
Positive alarm sequence and presignal systems delay occupant notification to allow for time for investigation of a fire. While both systems delay occupant notification, the function of the features and where they are permitted are different.