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fire alarm voltage drop ?

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    fire alarm voltage drop ?

    When is voltage drop an issue when dealing with fire alarm slc and nac loops?

    #2
    It becomes an issue when the wire run is too long, and/or the wire used is of insufficient gauge, and/or too many devices have been installed on that circuit. On a NAC, device(s) at/near the end of a circuit may not operate as intended, or at all. The system may show no troubles while not in an alarm condition. On a SLC that is similarly overloaded, you are likely to see intermittent troubles that would take me many paragraphs to explain coherently. The Cliff Notes version is digital signal degradation due to mistakes made on the voltage drop calculations or an installer that didn't follow the drawings or someone adding devices at a later date without paying attention to circuit limitations.

    It is possible to have a system that meets the manufacturer's requirements but does not meet the (in some cases) more stringent requirements of the AHJ, who has the final say on whether a permit gets signed off or not.

    Which situation are you running into?
    Last edited by MichaelGP3; 12-15-13, 02:18 PM.
    In battle, in forest, at the precipice in the mountains,
    On the dark great sea, in the midst of javelins and arrows,
    In sleep, in confusion, in the depths of shame,
    The good deeds a man has done before defend him.
    --Bhagavad-Gita

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      #3
      You're welcome.
      In battle, in forest, at the precipice in the mountains,
      On the dark great sea, in the midst of javelins and arrows,
      In sleep, in confusion, in the depths of shame,
      The good deeds a man has done before defend him.
      --Bhagavad-Gita

      Comment


        #4
        Originally posted by MichaelGP3 View Post
        You're welcome.
        Thank to u for your time and effort!

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