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March 27, 2007 A Penton Media Publication Vol. V No. 6



CONTENTS
250.10294 Bonding Jumper

What's Wrong Here?

Code Q&A

Code Quiz

NEC Report on Comments Now Available

EC&M Code Change Conferences


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    Top 50 NEC Rules















    250.10294 Bonding Jumper

    By Mike Holt
    Bonding jumpers must be of copper. Bonding jumpers must terminate by exothermic welding, listed pressure connectors, listed clamps, or other listed means. Sheet-metal screws cannot be used for termination of bonding conductors or connection devices [250.8].

    Bonding jumpers for service raceways must be sized in accordance with Table 250.66, based on the ungrounded service conductors within the service raceway. Where service conductors are paralleled in two or more raceways or cables, the bonding jumper for each raceway or cable must be sized on the ungrounded service conductors in each raceway or cable.

    Bonding jumpers on the load side of service equipment must be sized in accordance with Table 250.122, based on the rating of the circuit-protection device. A single bonding jumper sized in accordance with 250.122 can be used to bond multiple raceways or cables.

    Where the equipment bonding jumper is installed outside of a raceway, its length must not exceed 6 feet -- and it must be routed with the raceway. Exception: An equipment bonding jumper of any length can be used to bond isolated sections of metal raceways at outside pole locations.

    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: A potentially shocking installation


    Code Q&A
    By Mike Holt
    Q. Can a circuit breaker be used to switch fluorescent lighting?

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


    Code Quiz
    By Steven Owen
    Q. Where a transient voltage surge suppressor (TVSS) is installed, the TVSS shall comply with which of the following?

    1. The rating of the TVSS shall be equal to or greater than the maximum continuous phase-to-ground power frequency voltage available at the point of application.
    2. TVSS shall be a listed device.
    3. TVSS shall be marked with short circuit current rating and shall not be installed at a point on the system where the available fault current is in excess of that rating.
    4. TVSS shall not be installed on ungrounded systems, impedance grounded systems, or corner grounded delta systems unless listed specifically for use on these systems.
    5. All of the above.

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


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    Code News Update
    NEC Report on Comments Now Available
    The 2007 NEC Report on Comments is now available for all to view. Download the file from the NFPA Web site.

    See something in the report you're not too happy with? You can always file an amending motion on the technical committee report by submitting a Notice of Intent to Make a Motion by the deadline of May 4, 2007. Certified motions that receive notice of proper Amending Motions will be presented for action at the annual meeting to be held June 3-7, 2007 in Boston.


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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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