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

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

    The Fluke 1735 Power Logger is the ideal electrician or technician's power meter for conducting energy studies and basic power quality logging. Set the Power Logger up in seconds with the included flexible current probes and color display. The power quality meter measures most electrical power parameters, harmonics, and captures voltage events.

    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.

    Need help defining the parameters of your facility's next Arc Flash Hazard Evaluation? ESA's electrical engineers have written a detailed specification to help you determine what you need for your study. This Arc Flash tool is provided in a Word document that can be easily customized to include your facility's unique requirements. Request your Free Arc Flash Study Specification: Click here.

    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.

    Cool Electronic Cabinets
    Stop electronic control downtime due to heat, dirt and moisture. EXAIR Cabinet Coolers produce 20 degree Fahrenheit air from an ordinary supply of compressed air to cool electrical controls. Thermostat control minimizes air usage. UL Listed. Maintains the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web site offers detailed information, downloadable drawings and PDF literature.

    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.

    Eliminate Red Tags
    It takes more than the UL Mark on a product to satisfy code requirements. Before your next installation, use UL's Code Compliance Database to identify the correlation between model codes and UL Certified products, as well as find manufacturers of certified products.

    Click here today to find up-to-date UL Listed products at the UL Code Correlation Database.

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