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

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.

    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: 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
    Don't Miss This Important And Informative Webinar!

    April 24th, 2:00PM Eastern, 11:00AM Pacific: Arc Flash Hazard - Can HRG Technology Play a Role in Prevention? presented by Sergio Panetta, vice president of Engineering, i-Gard.

    This webinar will provide a short summary of solidly-grounded and high resistance grounding (HRG) systems, with particular emphasis on the prevalence of the solidly-grounded system and the inherent arc flash hazard associated with this option. It will also provide information as to the root causes of arc flash hazard and then discuss the following statement on HRG from the IEEE Std 141-1993 (Red Book):

    "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."

    Finally, the webinar will provide the rationale and technical understanding of how HRG technology can mitigate and reduce the arc flash hazard as well as important design considerations when specifying and installing an HRG system. For more information, click here.

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