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January 10, 2008 A Penton Media Publication Vol. VI No. 1


CONTENTS
408.7 Unused Openings

What's Wrong Here?

Code Q&A

Code Quiz

Michigan Electrical Code Requirements

Electric West


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    Top 50 NEC Rules















    408.7 Unused Openings

    By Mike Holt
    Unused openings for circuit breakers and switches must be closed using identified closures, or other means approved by the authority having jurisdiction, that provide substantially equivalent to the wall of the enclosure.

    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: Silly support.


    Code Q&A
    By Mike Holt
    Q. Section 110.14(C) requires the use of the 60°C column for 100A or less and the 75°C column for above 100A for conductor sizing. What is the value of THHN rated 90°C if the ampacity cannot be used for conductor sizing?

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


    Code Quiz
    By Steven Owen
    Q. Excluding exceptions, which one of the following locations does not require GFCI protection for 15A and 20A, 125V single-phase receptacles?

    1. bathroom (anywhere)
    2. within 6 feet of a sink in a commercial or industrial facility
    3. electric drinking fountain
    4. outdoors on a commercial building
    5. cord-and-plug connected vending machines
    6. outdoors and in or on a floating building or structure within the electrical datum plane
    7. within 20 feet of a decorative fountain
    8. in aircraft hangars where electric diagnostic equipment, electrical hand tools or portable lighting equipment are used
    9. in commercial garages where electric diagnostic equipment, electrical hand tools or portable lighting equipment are used
    10. dwelling unit attics, in accordance with 210.63

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


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    Code News Update
    Michigan Electrical Code Requirements
    In late November 2007, Michigan adopted the 2005 Michigan Electrical Code. According to the December 2007 issue of NEMA's electroindustry, the state exempted the following sections of the 2005 NEC: 501.30(B), 502.30(B), 503.30(B), 505.25(B), 506.25(B), 547.1 to 547.10, and Annex G. It also amended the following sections of the 2005 NEC: 230.40, 230.71(A), 250.118, 300.3(B), 334.10, 348.60, and 350.60. It's important to note that Michigan does not allow flexible metal conduit or liquidtight flexible metal conduit to serve as an equipment conductor. The full text of the amended sections may be viewed in this PDF file.


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    Shows and Events




    Electric West

    Year after year, electrical contractors, consultants, engineers, plant managers, and other electrical professionals make it their business to stay on top of the latest industry developments by attending the Electric West Conference program, schedule for Las Vegas from Feb. 27-29. It provides the tools you need to become more efficient, work faster, more profitably and stay ahead of the competition. Categories include:
    • Code Changes & Standards

    • Safety

    • Lighting

    • Residential Applications

    • Industrial Applications

    • Business Practices

    • 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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