NFPA Guide
Understand how NFPA 1221, 1225, and 72 work together in modern ERRCS projects.
NFPA 72 historically shaped in-building emergency communications requirements, NFPA 1221 addressed emergency services communications infrastructure, and NFPA 1225 consolidated the modern standards that many jurisdictions now point toward for testing, coverage, survivability, and maintenance.
In practice, owners and integrators need to reconcile the adopted fire code, the local AHJ's submittal standards, and whatever version of NFPA language the jurisdiction has incorporated into approval workflows.