---
title: Mass Notification Systems
…251 unchanged lines
- "Emergency operations / command center"
- "Police or campus dispatch"
− - "Per emergency response plan and AHJ (see drawings)"
+drawing_ref: "emergency response plan"
default: "Fire command center / fire department interface location"
```
…17 unchanged lines
- "Live voice (authorized LOC) > pre-recorded MNS emergency > fire alarm evacuation > supervisory/trouble > routine/test"
- "Pre-recorded MNS emergency > fire alarm evacuation > live voice > routine (where ERP requires automated priority)"
− - "Per emergency response plan prioritization matrix on drawings"
drawing_ref: true
default: "Live voice (authorized LOC) > pre-recorded MNS emergency > fire alarm evacuation > supervisory/trouble > routine/test"
…76 unchanged lines
- "1 W"
- "2 W"
− - "Per intelligibility design and ambient survey — see drawings"
drawing_ref: true
−default: "Per intelligibility design and ambient survey — see drawings"
+default: deferred
```
…14 unchanged lines
- "15 dB above average ambient (standard occupied spaces)"
- "5 dB above maximum ambient (intermittent high-noise spaces)"
− - "Per ambient sound survey — see drawings"
drawing_ref: true
default: "15 dB above average ambient (standard occupied spaces)"
…73 unchanged lines
- "Existing tower / structure"
- "Building rooftop / facade"
− - "Per site survey and GPS-recorded locations on site plan"
−drawing_ref: true
−default: "Per site survey and GPS-recorded locations on site plan"
+drawing_ref: "site plan"
+default: deferred
```
…204 unchanged lines
- "Level 2 — circuit-integrity (CI) cable or metallic conduit in 2-hour construction"
- "Level 3 — listed 2-hour fire-rated cable system"
− - "Per risk analysis and AHJ (see drawings)"
drawing_ref: true
−default: "Per risk analysis and AHJ (see drawings)"
+default: deferred
```
…12 unchanged lines
- "120V, single-phase, 60 Hz (standard)"
- "208V / 240V, single-phase, 60 Hz (large amplifier banks)"
− - "Per drawings"
drawing_ref: true
default: "120V, single-phase, 60 Hz (standard)"
…15 unchanged lines
- "24 hours standby + 30 minutes emergency operation (enhanced)"
- "60 hours standby + 15 minutes emergency operation (essential facility)"
− - "Per risk analysis / UFC 4-021-01 (see drawings)"
drawing_ref: true
default: "24 hours standby + 15 minutes emergency operation (standard voice/ECS)"
…6 unchanged lines
- "Sealed VRLA (valve-regulated lead-acid) batteries — standard"
- "Batteries supplemented by standby generator (extended duration)"
− - "Per drawings"
drawing_ref: true
default: "Sealed VRLA (valve-regulated lead-acid) batteries — standard"
…158 unchanged lines
## Intelligibility shall be re-verified after any change to the building acoustics, the speaker layout, or the message content that could affect it.