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June 4, 2009 A Penton Media Publication Vol. VII No. 11


CONTENTS
City of Phoenix Now Enforcing 2008 NEC

What's Wrong Here?

Code Q&A

Code Quiz

Enroll In EC&M University's Online Arc Flash Courses



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    Code News Update
    City of Phoenix Now Enforcing 2008 NEC
    As of May 1, 2009 the City of Phoenix is enforcing the requirements of the 2008 NEC, with a few minor modifications. A short list of city-approved amendments relate to the following sections of the Code:
    • Article 210 – Branch Circuits
      210.8 Ground-Fault Circuit-Interrupter Protection for Personnel
    • Article 250 – Grounding and Bonding
      250.118 Types of Equipment Grounding Conductors
    • Article 334 – Nonmetallic-Sheathed Cable; Types NM, NMC and NMS
      II. Installation
      334.10 Uses Permitted and 334.12 Uses Not Permitted
    To review the details of the amendments in PDF format, click here.



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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: Wireless A/C controls?


    Code Q&A
    By Mike Holt
    Q. We are being told that we must GFCI protect our receptacle for the washing machine if it is located within 6 ft of the laundry sink. Even though we chose to use a single receptacle for the washer, the inspector still won't pass it. Is he correct in his ruling?

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


    Code Quiz
    By Steven Owen
    When installing feeder conductors for portable switchboards at a facility like the Grand Ole Opry in Nashville, Tenn., an issue arises regarding the size of the supply neutral conductor. Here's the situation.

    Single-conductor feeder cables (not installed in raceways) are used on multiphase circuits feeding portable switchboards containing solid-state phase-control dimmers. This arrangement calls for the neutral conductor to have an ampacity of at least 130% of the ungrounded circuit conductors feeding the portable switchboard. The size of the largest ungrounded phase conductor is 500kcmil.

    What is the minimum size required for the supply neutral conductor is this example?

    1. Two sizes smaller (i.e., 350kcmil)
    2. Same size (i.e., 500kcmil)
    3. One size larger, just to be safe (i.e., 600kcmil)
    4. Minimum 650kcmil, which means you'll use a 700kcmil conductor

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



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    Shows and Events
    Enroll In EC&M University's Online Arc Flash Courses
    Need Arc Flash prevention training and continuing education, but don't have a travel budget? That's no problem. EC&M

    University’s e-Training Center is the answer! Just link to these live, online training courses directly from your computer. Each course will be presented in a concise and easy-to-understand manner by an industry acknowledged expert.
    • Arc Flash Testing Updates
      June 16, 2009
    • 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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