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December 18, 2008 A Penton Media Publication Vol. VI No. 24


CONTENTS
406.11 Tamper-Resistant Receptacles in Dwelling Units

What's Wrong Here?

Code Q&A

Code Quiz

Comments Sought on Proposed TIA

Electric West 2009


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    Top 2008 Code Changes
    406.11 Tamper-Resistant Receptacles in Dwelling Units
    By Mike Holt
    Requirements for tamper-resistant receptacles were added to the 2008 NEC. The new requirement states that all 15A and 20A, 125V receptacles in dwelling units shall be listed as tamper resistant.

    This rule applies to receptacles installed behind appliances, above countertops, and other locations out of the reach of children.


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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: Proper termination?


    Code Q&A
    By Mike Holt
    Q. Can a junction box contain both 277V and 120V conductors?

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


    Code Quiz
    By Steven Owen
    With respect to fixed stage equipment other than switchboards, what is the maximum ampere load permitted on a 20A branch circuit serving floodlights, border lights, and proscenium sidelights?

      1. 20A or 100%
      2. 16A or 80%, as per 210.20(A)
      3. 10A or 50%, as per 210.23(A)(2)

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


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    Code News Update
    Comments Sought on Proposed TIA
    As published in the December issue of NFPA News, the following Tentative Interim Amendment (TIA) has been proposed to the NFPA.

    NFPA 70-2008, National Electrical Code
    TIA Log No. 936
    Reference: 680.26
    Submitter: Wayne H. Robinson, Lothian, Md.
    1. Revise 680.26(B)(1)(b)(2) as follows: "Conform to the contour of the pool and the pool deck and the perimeter surfaces outlined in 680.26(B)(2)"
    2. Revise 680.26(B)(2)(b) as follows: "Alternate Means. Where structural reinforcing steel is not available or is encapsulated in a non-conductive compound, a copper grid conductor(s) shall be utilized where the following requirements are met:
    (1) At least one minimum 8 AWG bare solid copper conductor shall be provided.
    (2) The conductors shall follow the contour of the perimeter surface.
    (1) The copper grid shall be constructed of 8 AWG bare copper and be arranged meeting the requirements of 680.26(B)(1)(b)(3).
    (2) The copper grid shall follow the contour of the perimeter surface extending (3 ft) horizontally beyond the inside walls of the pool.
    (3) Only listed splices shall be permitted. (4) The required conductor shall be 450 to 600 mm (18 to 24 in.) from the inside walls of the pool.
    (5) The required conductor shall be secured within or under the perimeter surface 100 mm to 150 mm (4 in. to 6 in.) below the subgrade.
    (4) Be secured within or under the deck or unpaved surfaces no more than 150-mm (4 in. to 6 in.) from the underside of the deck."

    To review the submitter's reason and emergency nature text for this change, click here and scroll down to the bottom of page 2.

    This TIA has been published for public review and comment. Comments should be filed with the Secretary, Standards Council by January 16, 2009. You should identify the TIA number when submitting your comments. The Standards Council will review the technical committees' ballot results, the public comments, and any other information that has been submitted when it considers the issuance of the TIA at its March 3-4, 2009 meeting.


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    Shows and Events



    Electric West 2009

    The Electric West Show, to be held March 18-20, 2009 at the Las Vegas Convention Center in conjunction with the Power Quality Reliability Conference, is the perfect place to brush up on the latest NEC topics -- and earn continuing education credits in the process. Geared toward electrical contractors, consulting & specifying engineers, electricians, and plant facility personnel, there's something for everyone at the Electric Show. The biggest electrical marketplace in the western United States, this event attracts 250 exhibiting companies and more than 6,000 attendees every year. Here's a preview of some of the NEC seminars planned for next year's event:
    • One- and Two-Family Dwelling Unit Electrical Systems
    • Changes to the 2008 NEC
    • Swimming Pools and Similar Installations (NEC Article 680)
    • Introduction to the 2009 NFPA 70E
    For more information, visit our Web site.



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