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June 18, 2009 A Penton Media Publication Vol. VII No. 12


CONTENTS
Comments Sought on Proposed TIA

What's Wrong Here?

Code Q&A

Code Quiz

Enroll In EC&M University's Final Online Arc Flash Course


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

    NFPA 110-Proposed 2010 Edition, Standard for Emergency and Standby Power Systems
    TIA Log No. 965
    Reference: 7.13.4.1.3(a) and 7.13.4.3.4
    Submitter: David Stymiest, Smith, Seckman, Reid, Inc.

    Action:
    1. Revise section 7.13.4.1.3(a) as follows:
    "When the EPSS consists of paralleled EPSs, the quantity of EPSs intended to be operated simultaneously shall be tested simultaneously with the building load for a 2-hour period the test period identified in Section 7.13.4.1.3(j)."

    2. Revise section 7.13.4.3.4 as follows:
    "The data specified in 7.13.4.1.3(d), (e), (g), (h) and (i) shall be recorded at first load acceptance and every 15 minutes thereafter until the completion of the 2-hour test period identified in Section 7.13.4.1.3(j)."

    The "Emergency Nature" text for this TIA states: Section 5.2(a) is cited as the rationale on which to base the emergency nature of this proposed TIA. This section states, "The document contains an error or an omission that was overlooked during a regular revision process."

    To review the "Submitter's Substantiation" text for this proposed TIA, click here and review the text on pages 5 and 6.

    This TIA has been published for public review and comment. Comments should be filed with the Secretary, Standards Council by July 17, 2009. No form is required, but your comments should be submitted on company letterhead. Please 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 August 4-6, 2009 meeting.

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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: Missing and misapplied items


    Code Q&A
    By Mike Holt
     Q. Do we still have to bond the deck of an outdoor swimming pool if the deck is constructed of pavers?

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


    Code Quiz
    By Steven Owen
     When installing feeder conductors for a stage or set (per Art. 530), an issue arises regarding the size of the overcurrent protection devices for the feeder conductors. Here's the situation.

    The building is used primarily for motion picture production. The feeder conductors from the substation to the stages are protected by overcurrent protective devices (OCPDs) that are located in the substation. The overcurrent devices are multi-pole units. The calculated load is 500A, continuous. The feeder conductors consist of 2 sets of 400kcmil per phase, THHN or THWN conductors (the dual insulation rating on the conductor) installed in parallel in two separate raceways. For the purposes of ampacity adjustment, the neutral conductor in this example is not considered to be current-carrying.

    What is the minimum conductor size required for the feeder conductors, and what is the maximum size OCPD setting permitted per the above-referenced section of the Code?

    1. 4/0 AWG; 600A rating or setting of the OCPD.
    2. 300kcmil; 2,280A setting of the OCPD.
    3. 400kcmil; 800A rating or setting of the OCPD.
    4. 400kcmil; 2,680A setting of the OCPD.

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

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    Shows and Events
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    • Arc Flash Hazard Mitigation Case Studies
      June 25, 2009
    For more information, go to www.ecmuniversity.com. To register online, go to www.acteva.com/go/ecmuniversity.
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