NFPA 72 code sections · NFPA 72 Overview
Taking a system out of service is an impairment — and it has rules
Any time part of a fire alarm system is taken out of service — for testing, repair, or construction — the code treats it as an impairment. The owner or their representative and the AHJ must be notified, the monitoring station must be told so they don't dispatch on test signals, a tag must be placed at the panel showing the system is impaired, and mitigation (such as a fire watch) may be required until service is restored. When work is done, everyone is notified again and the tag comes off.
NFPA 72 reference
Chapter 10 — Fundamentals
10.21 Impairments (10.21.1 through 10.21.4); see also 14.2.2 for notification before testing
References use NFPA 72 2019/2022 numbering — section numbers can shift between editions, so confirm in the edition your AHJ has adopted.
On the job
A tech starts a zone-by-zone test without calling the central station. The first pull station sends an alarm, the fire department rolls, and the owner is billed for a false dispatch. Had the tech followed the impairment procedure — notify the owner, AHJ, and monitoring company, hang the tag, then test — the same work would have been routine.
Quick check
1. Before taking a system out of service for testing, you must notify:
2. A tag at the control unit during an impairment tells people that:
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