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December 17, 2009 A Penton Media Publication Vol. VII No. 24



CONTENTS
Pending Code Change Item for 2011 NEC

What's Wrong Here?

Code Q&A

Code Quiz

Calling All Code Writers

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 17 has voted to accept a Code change submitted by Ted "Smitty" Smith, Electrical Experts Consulting (Log #3845 NEC-P02). The recommendation calls for revising a portion of the text in Table 220.102 as follows:

    "Loads expected to operate simultaneously, but not less than 125 percent full-load current of the largest motor and not less than the first 60 amperes of load.The greater of the following: All loads that are expected to operate simultaneously, 125 percent of the full load current of the largest motor, or the first 60 amperes of the load."

    The remaining text and numbers in the Table will remain as is.

    As noted in the substantiation summary, this new wording does not change the intent of the requirement, but hopefully makes things a little more clear for end-users. Smitty is an apprentice instructor who teaches journeyman continuing education courses in Colorado. He says the existing wording of this rule causes confusion for his students.

    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: Box support


    Code Q&A
    By Mike Holt
    Q. Are AFCIs required for light fixtures and smoke alarms?

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


    Code Quiz
    By Steven Owen
    Fill in the blank
    When working with electrical systems, including multi-conductor cables, identification of conductors is an important issue. For example, on a new 480/277V, 3-phase, 4-wire system, the NEC requires you to identify conductors by phase or line and system [210.5(C)]. It is common practice to identify these ungrounded conductors with an outer finish (i.e., insulation color) that is: brown, orange, and yellow; gray for the grounded conductor; and green, green with one or more yellow stripes, or bare for the equipment grounding conductor. But when working on existing electrical systems, such as 480/277V, 3-phase, 4-wire systems, you should take care because the color __________ may have been used for an ungrounded conductor. Hint: See the Fine Print Note.

    1. white
    2. white with one or more colored stripes, other than green
    3. black with three distinctive white stripes on its entire length
    4. gray

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


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    Code News Update
    Calling All Code Writers
    Don't miss an opportunity to help create the next edition of NFPA 70E, Standard for Electrical Safety in the Workplace. Time is running out! You have between now and Jan. 5, 2010 to submit your proposals for new requirements, revisions to existing requirements, or deletion of existing requirements. But don't just fly by the seat of your pants and submit a poorly worded submission without any technical justification. It's important that you draft your proposal in a clear and simple manner and back it up with technical justification. You must convince the Code committee members that your change makes sense for all parties involved. You can download a proposal form directly from the NFPA Web site.


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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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