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December 27, 2007 A Penton Media Publication Vol. V No. 24

408.4 Circuit Directory or Circuit Identification

What's Wrong Here?

Code Q&A

Code Quiz

Electric West

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    Top 50 NEC Rules

    408.4 Circuit Directory or Circuit Identification

    By Mike Holt
    All circuits and circuit modifications must be legibly identified as to their clear, evident, and specific purpose. The identification must include sufficient detail to allow each circuit to be distinguished from all others, and the identification must be on a circuit directory located on the face or inside of the door of a panelboard.

    Editor's note: This information was extracted from Mike Holt's textbook, Understanding the National Electrical Code

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    Code Challenge
    What's Wrong Here?

    By Joe Tedesco

    Think you know how this installation violates the NEC?

    Visit EC&M's Web site to see the answer.

    Hint: Low rent, no heat

    Code Q&A
    By Mike Holt
    Q. Is there any allowance in the NEC to locate receptacles in dwelling units where it is convenient for furniture layout or the designer's wishes, if the required number of receptacles is installed?

    Visit EC&M's Web site to see the answer.

    Code Quiz
    By Steven Owen
    Q. For a 20A, 125V, single-phase receptacle that supplies power to a cord-and-plug connected metering pump, which is integral to a continuous industrial process that cannot tolerate an unexpected loss of power, installed outdoors in an industrial facility, the 20A receptacle __________. Note that qualified personnel maintain this industrial facility and an assured equipment grounding conductor program is in place.

    1. has no special requirements in this example.
    2. must have a weatherproof cover per 406.8(B)(1) only.
    3. must have a weatherproof cover per 406.8(B)(1) and have GFCI protection.
    4. must have a weatherproof cover per 406.8(B)(1), however, it does not have to have GFCI protection.

    Visit EC&M's Web site for the answer and explanation.

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    Electric West

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    • Home Automation

    For 2008, the Power Quality segment will be expanded into its own separate conference. For more information and to register, visit the Electric West Web site.

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