This article was posted 12/14/2007 and is most likely outdated.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
(Click on image to enlarge)

       
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Comments

  • The electrical inspector on my house required a separate, non-afci, circuit for the smoke detectors. His reasoning was that he did not want the detector to trip in the event there was an arc fault in the bedroom. Apparently this is a cause of fire and he wanted the detector live regardless

    David Dodgen
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