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November 27, 2007 A Penton Media Publication Vol. V No. 22


CONTENTS
314.29 Wiring to be Accessible

What's Wrong Here?

Code Q&A

Code Quiz

EC&M Code Change Conferences


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    Top 50 NEC Rules


















    314.29 Wiring to be Accessible

    By Mike Holt
    Boxes, conduit bodies, and handhole enclosures must be installed so that the wiring is accessible without removing any part of the building, sidewalks, paving, or earth.

    Exception: Listed boxes and handhole enclosures can be buried if covered by gravel, light aggregate, or non-cohesive granulated soil, and their location is effectively identified and accessible for excavation.

    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?
    Think you know how this installation violates the NEC? Visit EC&M's Web site to see the answer.

    Hint: New water feature.


    Code Q&A
    By Mike Holt
    Q. A single main breaker is installed, then taps supply individual meters with disconnecting means for individual tenants. Should a main bonding jumper be installed at the single main breaker or at each separate disconnect?

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


    Code Quiz
    By Steven Owen
    Q. What is the maximum allowable ampacity of a 10 AWG THHN or THWN-2 insulated conductor installed in a schedule 80 PVC raceway (90°C rated) installed underground from the branch-circuit panelboard to the luminaires installed for parking lot lighting? There are four current-carrying conductors in this raceway. Disregard the terminals and the branch-circuit rating for this example.

    1. 32A
    2. 30A
    3. 28A
    4. 24A

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


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    Shows and Events
    EC&M Code Change Conferences
    Where do you turn when you need accurate information on changes to the National Electrical Code? Acknowledged as the leaders in providing information on the NEC, EC&M magazine and EC&M Seminars have been the preferred sources of this information for more than 60 years. Seven Code change conferences have been scheduled in the fall of 2007. Host cities include: Atlanta, Boston, Dallas, Orlando, Philadelphia, St. Louis, and Seattle.

    As an approved provider with the National Council of Examiners for Engineering and Surveying (NCEES), through its Registered Continuing Education provider Program (RCEPP), professional engineers attending any of our 2008 Code change conferences will receive Professional Development Hours (PDHs), a requirement for re-licensing in many states. The conferences are also approved by every state that has a continuing education requirement for contractors and electricians.

    For additional information on the dates and locations of these events, click here.


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