Answer
Feb 20, 2026 - 01:03 PM
The National Electrical Code (NEC) requires that smoke detectors in commercial buildings be supplied by a reliable power source, typically connected to the building's primary power with battery backup (NEC 760). The installation must follow the manufacturer's instructions and local codes, and wiring must use approved fire alarm circuits and listed materials. However, the exact placement and quantity are governed by NFPA 72, not the NEC.
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