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    jimart's Avatar
    jimart Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 29, 2012, 12:03 PM
    Allowable voltage tolerance for a 120 volt cicuit
    What is the allowable voltage tolerance for a 120 volt cicuit per the NEC and what is the code reference?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Oct 29, 2012, 12:25 PM
    Allowable? Anything.
    Recommended? 3%.

    Is this a test or homework? Let us know and we'll let you know where to look.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #3

    Oct 29, 2012, 01:34 PM
    This is outside the NEC. Most devices are designed to function properly within a 10% +/- bandwidth. That is a product specification. So a 120 Vac device could work properly within a 132 volt A/C or a 108 volt circuit.

    What Stan is referring to is the 5% end to end voltage drop of a cable run. Because this is a "FPN" (fine print note) in the 2008 NEC and an "IN" (Informational note) in the 2011 release of code it is a recommendation only. It is not code enforceable.

    So, what exactly are you asking about?
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