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January 21, 2010 A Penton Media Publication Vol. VIII No. 2



CONTENTS
Pending Code Change Item for 2011 NEC

What's Wrong Here?

Code Q&A

Code Quiz

Comments Sought on Proposed TIA

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 4 has voted to accept a Code change submitted by Lanny G. McMahill of Phoenix. (Log #454 NEC-P04). The recommendation calls for adding a new exception to 230.24(A), which reads as follows:

    "Exception No. 5: Where the voltage between conductors does not exceed 300 and the roof area is guarded or isolated, a reduction in clearance to 900 mm (3 ft) shall be permitted."

    As noted in the substantiation summary, this new exception will correlate with allowances in the National Electrical Safety Code (NESC). McMahill points out that there is currently a minor conflict with the exceptions in the NEC and the NESC. This change will better correlate the two documents.

    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: Think clearances


    Code Q&A
    By Mike Holt
    Q. What are the bonding requirements for transformers?

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


    Code Quiz
    By Steven Owen
    Fill in the blank

    When installing disconnecting means for multi-wire branch circuits in temporary installations, the disconnecting means must disconnect all ungrounded conductors at the power outlet or panelboard where the branch circuit originates. The power outlet may be __________.

    1. an enclosed assembly that may include circuit breakers
    2. an enclosed assembly that may include fuseholders
    3. an enclosed assembly that may include fused switches
    4. all of the above

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


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    Code News Update
    Comments Sought on Proposed TIA
    The following Tentative Interim Amendment (TIA) has been issued by the NFPA.

    NFPA 70E-2009, Standard for Electrical Safety in the Workplace
    TIA Log No. 981
    Reference: 130.3, Exception No. 1
    Submitter: Daleep Mohla, DCM Electrical Consulting Services, Inc.

    1. Delete Exception No. 1 to Section 130.3, Arc Flash Hazard Analysis, which presently reads as follows:

    Exception No. 1: An arc flash hazard analysis shall not be required where all of the following conditions exist:
    (1) The circuit is rated 240 volts or less.
    (2) The circuit is supplied by one transformer.
    (3) The transformer supplying the circuit is rated less than 125kVA.

    2. Renumber Exception No. 2 as Exception.

    To review the submitter's reason substantiation and emergency nature text for this change, click here.

    This TIA has been published for public review and comment. Comments should be filed with the Secretary, Standards Council by February 1, 2010. 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 2-3, 2010 meeting.


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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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