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April 23, 2009 A Penton Media Publication Vol. VII No. 8

800.156 Dwelling Unit Communications Outlet

What's Wrong Here?

Code Q&A

Code Quiz

Cast Your Vote for the EC&M Product of the Year!

Enroll In EC&M University's Online Arc Flash Courses


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    Top 2008 Code Changes

    800.156 Dwelling Unit Communications Outlet

    By Mike Holt
    A new section was added to the 2008 NEC addressing communications outlets within dwelling units. It states no less than one communications outlet shall be installed within each dwelling unit cabled to the service provider demarcation point.

    This new section was added to require that a communications outlet be provided at the location of the communications service entrance to a dwelling for new construction. There was previously no requirement for a communications outlet in a dwelling unit.

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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: These groups don't get along well with each other.

    Code Q&A
    By Mike Holt
    Q. I am hearing differing opinions about the requirements for bonding steel gas piping. What are the rules for this?

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

    Code Quiz
    By Steven Owen
    When installing electrical equipment in manholes, which are intended for personnel entry, with all of the electrical equipment installed on one wall (opposite electrical cabling), what is the requirement for work space (with respect to the electrical equipment) according to Part V of Art. 110?
    Note: The electrical equipment is operating at 240V and has live parts that may require examination while energized.

    1. There is no requirement. Just use good judgment.
    2. With respect to the electrical equipment and its clear work space, there must be a minimum depth of 30 in. as you approach the equipment, 36 in. width, and 72 in. vertical height/headroom.
    3. With respect to the electrical equipment and its clear work space, there must be a minimum depth of 36 in. as you approach the equipment, 30 in. width, and 72 in. vertical height/headroom.
    4. As long as the "qualified person" entering the manhole is wearing Level 4 flame-resistant PPE, including Level 4 flash suit hood, along with 00 rubber insulating liners and leather protectors, hearing protection inserts, safety glasses, and leather work shoes, the issue of clear work space goes away, as the "qualified person" is completely protected.

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

    Cool Electronic Cabinets
    Summer will be here soon! Prevent hot weather failures. EXAIR’s compact Cabinet Coolers are the low cost way to purge and cool electronic controls with 20 degree Fahrenheit air. All models are UL Listed and maintain the NEMA 4, 4X or 12 rating of the enclosure. Many cooling capacities are available. Web site offers detailed information, downloadable drawings and PDF literature. EXAIR Corporation click here for more information

    EC&M Product of the Year Competition
    Cast Your Vote for the EC&M Product of the Year!
    Would you like to help pick the prestigious EC&M Product of the Year winner and qualify for a chance to win $100? If you're an EC&M subscriber, make your vote count by visiting the 2009 EC&M Product of the Year Poll. To review the products, click on the links for each of the 29 category winners to read a brief description and view a photo. Once you're finished with your review, enter your contact information, choose your favorite product from the drop-down menu, and click submit.

    Your selection will help us identify the 2009 EC&M Product of the Year Platinum, Gold, and Silver award winners. As an added incentive, three lucky voters will be randomly selected to receive a $100 gift check.

    The voting poll will remain open through 5 p.m. on June 19, 2009. Only one vote per EC&M subscriber, please. Any votes received from manufacturers, PR firms, or non-EC&M readers will be discarded.


    Have a UL White Book but not sure how to use it?Discover why the UL White Book is Part 2 of the NEC and how it will help you avoid "Red Tagged" jobs. Click here to learn how to use the White Book online FREE (or to order a copy).

    Shows and Events
    Enroll In EC&M University's Online Arc Flash Courses
    Need Arc Flash prevention training and continuing education, but don't have a travel budget? That's no problem. EC&M University’s e-Training Center is the answer! Just link to these live, online training courses directly from your computer. Each course will be presented in a concise and easy-to-understand manner by an industry acknowledged expert.
    • High Resistance Grounding and Arc Flash Accident Prevention
      May 7, 2009
    • Mitigation of Arc Flash Hazards Using Fuses
      May 12, 2009
    • Arc Flash Testing Updates
      June 16, 2009
    • Arc Flash Hazard Mitigation Case Studies
      June 25, 2009
    For more information, go to To register online, go to

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