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November 5, 2009 A Penton Media Publication Vol. VII No. 21



CONTENTS
Pending Code Change Item for 2011 NEC

What's Wrong Here?

Code Q&A

Code Quiz

Louisiana One Step Closer to Adoption of 2008 NEC

Electric West 2010



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    Change Proposals
    Pending Code Change Item for 2011 NEC
    As noted in the NEC Committee Report on Proposals, 2010 Annual Revision Cycle, Code-Making Panel 6 has voted to accept a Code change proposal generated by the NFPA/CSA NEC/CEC Ampacity Harmonization Task Group and submitted by representative James M. Daly (Log #635 NEC-P06). The recommendation calls for revising the first column heading in Table 310.15(B)(2)(a) from "Number of Current-Carrying Conductors" to "Number of Conductors (See Note 1)" and adding a note below the table before FPN No. 1 to read: "Number of Conductors is the total number of conductors in the raceway or cable adjusted in accordance with 310.15(B)(4) and (5)."

    As noted in the substantiation summary, this Table was originally added to the Code in 1940, and the column heading remained as "Number of Conductors" until 1993. During the 1993 NEC revision cycle, the column headings in Table 310.15(B)(2)(a) and Table B.310.11 were editorially changed to "Number of Current-Carrying Conductors." However, there was no Proposal, Comment, or Panel Action to make the change. This reinstatement of the original column heading permits the user to take the total number of conductors in the cable or raceway and subtract the neutral conductors not required to be counted under 310.15(B)(4) and the grounding or bonding conductors not required to be counted under 310.15(B)(5). The result is the number of conductors that may be simultaneously energized — this number would be used to select the adjustment factor from the Table. The correction to the column heading also correlates with the column headings in Table 400.5 in the NEC and Table 5C in the 2006 Canadian Electrical Code, Part I.

    You can download an electronic version of the report via the NFPA Web site.

    Although the comment period is now closed, the results of the committee action on all submitted comments will be published in the NEC Committee Report on Comments, which will be made available to all who request it. The Report on Comments mail date is scheduled for March 29, 2010.


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    Code Challenge
    What's Wrong Here?
    By Brian J. McPartland
    Think you know how this installation violates the NEC? Visit EC&M's Web site to see the answer. Hint: Fixtures permitted in clothes closets


    Code Q&A
    By Mike Holt
    Q. When are tamper-resistant receptacles required?

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


    Code Quiz
    By Steven Owen
    In single-family and multi-family dwellings, what are the minimum and maximum lengths permitted for the grounding conductor on network-powered broadband communications systems network interface units that contain protectors? Ignore any possible exceptions noted.

    1. Minimum — as short as practicable / maximum — 20 ft
    2. Minimum — 2.5 ft / maximum — 6 ft
    3. Minimum — 4 ft / maximum — 10 ft
    4. Minimum — as short as practicable / maximum — 6 ft

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


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    Code News Update
    Louisiana One Step Closer to Adoption of 2008 NEC
    According to a recent Code Alert issued on October 30, 2009 by the National Electrical Manufacturers Association (NEMA), an administrator for the Louisiana State Uniform Construction Code Council (LSUCCC) recently announced the official implementation date for the 2008 NEC in the state of Louisiana is Jan. 1, 2010. The LSUCCC originally adopted the 2008 NEC without amendment on April 14, 2009.


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    Shows and Events





    Electric West 2010

    The Electric West Show, to be held March 16-18, 2009 at the Las Vegas Convention Center, 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, the conference program will offer the following NEC seminars, presented by industry experts such as Mike Holt, Keith Lofland, and Edward Gorginian.
    • Analysis of 2011 NEC Changes
    • Understanding Important NEC Requirements
    • Dwelling Calculations
    • Advanced NEC Calculations
    • Grounding vs. Bonding
    • Swimming Pools and Similar Installations
    For more information, visit our Web site, or click here to register.



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