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Reference · Fundamentals

Emergency Communications SystemECS

A system that delivers voice or text instructions for emergencies — in-building fire emergency voice/alarm communications (EVACS) and mass notification systems (MNS).

NFPA 72: Chapter 24

Section numbers vary by edition — confirm in the edition your AHJ has adopted.

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Read more in these guides

Voice Evacuation Intelligibility, Explained (NFPA 72 Chapter 24)A voice message no one can understand is worse than a tone. Here's how Chapter 24 turns 'clear enough to act on' into something you can design and measure.

Related terms

Fire Alarm Control PanelMonitor (Input) ModuleRelay (Control) Module
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