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July 13, 2007 A Penton Media Publication Vol. V No. 13



CONTENTS
300.5 Underground Installations Correction

300.10 Electrical Continuity

What's Wrong Here?

Code Q&A

Code Quiz

Let's Go Racing! Win a Free Road America Race Weekend for Two

EC&M Code Change Conferences


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    Editorial Correction
    300.5 Underground Installations Correction
    In the previous issue of CodeWatch, Mike Holt's Top 50 NEC Rules item focused on the topic of underground installations. Item (1) focused on the protection of direct buried conductors and cables emerging from grade. The second sentence in this paragraph read as follows: "Protection isn't required to extend more than 18 inches below grade, and protection above grade must extend to a height not less than 18 feet." As many of you most likely noted, the "18 feet" reference is incorrect. The correct minimum height is "8 feet." The editors would like to apologize to the author and the subscribers for this error.


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    Top 50 NEC Rules
















    300.10 Electrical Continuity

    By Mike Holt
    All metal raceways, cable, boxes, fittings, cabinets, and enclosures for conductors must be metallically joined together (bonded) to form a continuous low-impedance fault-current path that is capable of carrying any fault current likely to be imposed on it [110.10, 250.4(A)(3), and 250.122]. Metal raceways and cable assemblies must be mechanically secured to boxes, fittings, cabinets, and other enclosures.

    Exception 1: Short lengths of metal raceways used for the support or protection of cables aren't required to be electrically continuous, nor are they required to be bonded to an effective ground-fault current path [250.86 Ex. 2 and 300.12 Ex.].

    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: I stayed at a Holiday Inn last night!


    Code Q&A
    By Mike Holt
    Q. In a dwelling unit, what are the receptacle requirements for island counter tops?

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


    Code Quiz
    By Steven Owen
    Q. When installing metal-armored cables and metal raceways, is it permissible to connect a metal-armored cable or a metal raceway to a nonmetallic box?

    1. Yes, as long as the armored cable is BX cable or equivalent. There is an internal equipment grounding conductor, however, there is no internal bonding means available to bond the armored cables together.
    2. Yes, as long as the raceway is flexible metal conduit or liquidtite flexible metal conduit installed in a length not to exceed 6 feet. There is no internal equipment grounding conductor or and no bonding means available to bond the cables together.
    3. Yes. Where internal bonding means are provided between all entries, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.
    4. No way! This is not going to happen according to the rules of the NEC.

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


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    Shows and Events
    Let's Go Racing! Win a Free Road America Race Weekend for Two
    EC&M magazine and Generac Power Systems have teamed up to offer an expenses-paid weekend (August 10-12, 2007) featuring two of the world's fastest racing series. The third annual Generac Power Weekend is one thrilling day of American LeMans series racing (the Generac 500) and an equally exciting day of Champ Car racing at its finest (the Generac Grand Prix). It's your chance to see both series compete in a single weekend at one of North America's most beautiful tracks. Located in the hilly heart of Wisconsin's scenic Kettle Moraine area, Road America is a four-mile permanent road course that tests drivers with 14 challenging turns.

    Enter by July 10, 2007. Visit the Generac Power Systems virtual booth at the EC&M E-Tradeshow. Full contest rules are available online in the Generac E-Tradeshow booth. For more information about the Generac Power Weekend, go to www.roadamerica.com.


    EC&M Code Change Conferences
    Where do you turn when you need accurate information on changes to the National Electrical Code? Acknowledged as the leaders in providing information on the NEC, EC&M magazine and EC&M Seminars have been the preferred sources of this information for more than 60 years. Seven Code change conferences have been scheduled in the fall of 2007. Host cities include: Atlanta, Boston, Dallas, Orlando, Philadelphia, St. Louis, and Seattle.

    As an approved provider with the National Council of Examiners for Engineering and Surveying (NCEES), through its Registered Continuing Education provider Program (RCEPP), professional engineers attending any of our 2008 Code change conferences will receive Professional Development Hours (PDHs), a requirement for re-licensing in many states. The conferences are also approved by every state that has a continuing education requirement for contractors and electricians.

    For additional information on the dates and locations of these events, click here.

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