April 25, 2006 A Prism Business Media Publication Vol. IV No. 8



CONTENTS
90.3 Code Arrangement

What's Wrong Here?

Code Q&A

Code Quiz

NEMA Active on the 2008 Code Revision Front


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    Top 50 NEC Rules

























    90.3 Code Arrangement

    By Mike Holt
    The NEC consists of an introduction and nine chapters. The requirements noted in Chapters 1 through 4 apply to all installations. The requirements in Chapters 5, 6, and 7 apply to special occupancies, special equipment, or other special conditions and can supplement or modify the requirements found in Chapters 1 through 4.

    For example, the general requirements in 250.118 state that a metal raceway, such as EMT, is suitable to provide a low-impedance path to the power supply for ground fault current. However, 517.13(B) of Art. 517 (Health Care Facilities) doesn't consider the raceway to be sufficient. It requires you to install an insulated copper conductor in the raceway for this purpose.

    Chapter 8 contains the requirements for communications systems such as telephone, antenna wiring, CATV, and network-powered broadband systems. Communications systems aren't subject to the general requirements of Chapters 1 through 4, or the special requirements of Chapters 5, 6, and 7 -- unless there's a specific reference noted in Chapter 8 to these earlier chapters.

    Chapter 9 contains the tables necessary to calculate raceway sizing, conductor fill, and voltage drop. Annexes aren't part of the Code, but are included for informational purposes.

    Editor's note: This information was extracted from Mike Holt's textbook, Understanding the National Electrical Code.


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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: Separation anxiety


    Code Q&A
    By Mike Holt
    Q. Can an air duct be installed directly above an electrical panel?

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

    Code Quiz
    By Steven Owen
    Q. Excluding exceptions, what is the requirement for cabling work space, which includes a requirement for a clear work space not less than __________ wide where cables are located on both sides? In the case of cables installed on one side only, the minimum clear workspace shall not be less than 750 millimeters (2 feet 6 inches) wide. The vertical headroom shall not be less than __________, unless the opening is within 300 millimeters (1 foot), measured horizontally, of the adjacent interior wall of the enclosure.
    A) 3 feet 6 inches / 6 feet
    B) the width of the equipment / 6 feet 6 inches or the height of the equipment
    C) 8 feet or the width of the equipment / 6 feet 7 inches or the height of the equipment
    D) 900 millimeters (3 feet) / 1.8 meters (6 feet)

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


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    Code News Update
    NEMA Active on the 2008
    Code Revision Front

    According to the April 2006 issue of Electroindustry, 40 of the 56 2008 Code change proposals submitted by NEMA have been accepted. Many of the revisions are focused on personnel safety devices and fire protection devices. According to the write-up, accepted revisions include:
    • A new requirement for 120V receptacle outlets at all dwelling balcony, deck, and porch areas. The outlets would have to be GFCI protected.
    • An expansion of AFCI protection in dwellings to include all 120V, 15A, and 20A branch circuits.
    • An extension of GFCI protection to cover all outdoor non-dwelling 120V, 15A, and 20A outlets and all 120V outlets located within 6 feet of a sink.
    • A new Article 626 for Electrified Parking Space Equipment.
    • Revision of Article 382 to include a new "concealable nonmetallic extension" wiring method.
    • The acceptance of rigid nonmetallic raceway wiring methods in hazardous, classified locations.
    • Relocation of Table 430.91 to Article 110, which would provide a Code-wide selection criteria for enclosure types.

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