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April 17, 2008 A Penton Media Publication Vol. VI No. 8


CONTENTS
Article 100: Definition of “Ground”

What's Wrong Here?

Code Q&A

Code Quiz



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    Top 2008 Code Changes
    Article 100: Definition of “Ground”
    By Mike Holt
    The NEC Grounding Task Group revised the definition for “ground” as follows to improve the usability of the NEC.

    “The earth or some conducting body that serves in place of the earth.”

    The revised definition is a good improvement because it provides a simple description. Previous language, “some conducting body that serves in place of the earth” was deleted, as the phrase left Code users wondering what this really meant.

    Coordinating changes were made throughout the NEC to reflect the new definition.




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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: Overcrowding?


    Code Q&A
    By Mike Holt
    Q. I was told that a back-fed breaker needs to be bolted into the panel. Is this correct?

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


    Code Quiz
    By Steven Owen
    Q. What is the minimum cubic inch area required for a terminal housing supplied with a generator? The conductors installed within the terminal housing are as follows: four No. 6 AWG THHW branch-circuit conductors and four No. 8 AWG MTW insulated conductors.

    1. This calculation does not apply to a terminal housing supplied with the generator.
    2. 20 cubic inches minimum. This applies only to the branch circuit conductors.
    3. 12 cubic inches minimum
    4. 32 cubic inches minimum

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


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    Shows and Events
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    "7.2.2 There is no arc flash hazard (with high resistance grounding systems), as there is with solidly grounded systems, since the fault current is limited to approximately 5A."

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