Public Address and Paging Systems
Remake batch 26: rewritten from scratch under the authoring cheatsheet with datasheet constraints; neighbors re-pointed to the new scope boundaries; the electrical code is now the adopted-electrical-code project fact
Showing changes from Rev 3
to Rev 4
in Public Address and Paging Systems.
---
title: Public Address and Paging Systems
…2 unchanged lines
description: >
When to use: centralized amplifier-based or IP-networked audio distribution for routine announcements, background music, general intercom, and zone-based paging across buildings and campuses (schools, universities, offices, industrial facilities, warehouses, healthcare campuses, correctional facilities, and transportation terminals). Covers system architecture (70-volt constant-voltage analog vs. IP-networked audio), master and remote paging stations, amplifiers and digital signal processors, loudspeakers, supervision, intelligibility, and the interface to fire alarm voice evacuation.
− Not intended for: life-safety voice evacuation and emergency mass notification triggered by a fire alarm panel (use [[sync/mass-notification-systems]] and [[sync/fire-alarm-systems]] for the NFPA 72 Chapter 24 Emergency Communications System); fire alarm initiating devices and listed control units ([[sync/fire-alarm-systems]]); backbone cabling ([[sync/structured-cabling]]); pathways, conduit fill, and telecom rooms ([[sync/telecommunications-rooms-and-pathways]] and [[sync/raceways-and-conduit]]); cellular and public-safety radio coverage ([[sync/distributed-antenna-systems]]); security and access-control entrance intercoms; and auditorium sound reinforcement or AV presentation systems.
+ Not intended for: life-safety voice evacuation and emergency mass notification triggered by a fire alarm panel (use [[sync/mass-notification-systems]] for the NFPA 72 Chapter 24 Emergency Communications System and [[sync/fire-alarm-systems]] for the voice evacuation hardware); fire alarm initiating devices and listed control units ([[sync/fire-alarm-systems]]); backbone cabling ([[sync/structured-cabling]]); pathways, conduit fill, and telecom rooms ([[sync/telecommunications-rooms-and-pathways]] and [[sync/raceways-and-conduit]]); cellular and public-safety radio coverage ([[sync/distributed-antenna-systems]]); security and access-control entrance intercoms; and auditorium sound reinforcement or AV presentation systems.
---
…12 unchanged lines
## What this standard does not cover {note}
−- Life-safety voice evacuation and emergency mass notification initiated by a fire alarm control unit are covered by [[sync/mass-notification-systems]] and [[sync/fire-alarm-systems]]; NFPA 72 Chapter 24 Emergency Communications System requirements belong in those standards.
+- Life-safety voice evacuation and emergency mass notification initiated by a fire alarm control unit are covered by [[sync/mass-notification-systems]], with the voice evacuation hardware under [[sync/fire-alarm-systems]]; NFPA 72 Chapter 24 Emergency Communications System requirements belong in those standards.
- Fire alarm initiating devices, annunciators, and listed fire alarm control units are covered by [[sync/fire-alarm-systems]].
- Backbone cabling infrastructure is covered by [[sync/structured-cabling]]; conduit fill, pathway design, and telecommunications and equipment rooms are covered by [[sync/telecommunications-rooms-and-pathways]] and [[sync/raceways-and-conduit]].
…603 unchanged lines
### The Contractor shall furnish at least one spare amplifier module of each installed rating where N+1 redundancy is not provided.