This article was posted 12/14/2007 and is most likely outdated.

Article 760 Fire Alarm Systems - 760.21
 

 
Subject - Article 760 Fire Alarm Systems - 760.21
Based on - NEC - 2005 Edition

December 14, 2007
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Fire Alarm Systems

760.21 GFCI and AFCI Protection

Part II. Nonpower-Limited Fire Alarm (NPLFA) Circuits

New rule prohibits AFCI protection of the 120V circuit that supplies power for a nonpower-limited fire alarm system.

The power source for a nonpower-limited fire alarm circuit cannot be supplied through ground-fault circuit interrupters or arc-fault circuit interrupters. Figure 760-2

Author’s Comment: This GFCI/AFCI limitation only applies to the circuit that supplies a nonpower-limited fire alarm system. Smoke detectors connected to a 15 or 20A, 120V circuit must be AFCI-protected if located in the bedroom of a dwelling unit [210.12(B)]; because according to NFPA 72, National Fire Alarm Code the circuit for the smoke detectors isn’t the power source of a nonpower-limited fire alarm circuit.



Figure 760-2
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Comments

  • What is the application for non-power limited firealarm systems? Thanks, David

    david
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