May 11, 2006 A Prism Business Media Publication Vol. IV No. 9



CONTENTS
90.4 Enforcement

What's Wrong Here?

Code Q&A

Code Quiz

NEC Sessions Scheduled for 2006 NFPA World Safety Conference & Exposition


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    90.4 Enforcement

    By Mike Holt
    The Code is set up for enforcement by governmental bodies that exercise legal jurisdiction over electrical installations for power, lighting, signaling circuits, and communications systems. Enforcement of the NEC is the responsibility of the authority having jurisdiction (AHJ), which is responsible for interpreting requirements, approving equipment and materials, waiving Code requirements, and ensuring the equipment is installed in accordance with listing instructions.

    Although the AHJ is responsible for interpreting the NEC, his or her decisions must be based on a specific Code requirement. If they reject an installation, they're legally responsible for informing the installer which specific NEC rule was violated.

    Only the AHJ has authority to approve the installation of equipment and materials. Typically, the AHJ will approve equipment listed by a product testing organization such as Underwriters Laboratories, Inc. (UL). However, the NEC doesn't require all equipment to be listed. This means that he or she can reject an installation of listed equipment and can approve the use of unlisted equipment. But given our highly litigious society, approval of unlisted equipment is becoming increasingly difficult to obtain.

    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: Is something missing here?



    Code Q&A
    By Mike Holt
    Q. Can the service disconnect be located within 5 feet of a pool or hot tub?

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

    Code Quiz
    By Steven Owen
    Q. According to 110.16, certain information is required on the label when marking switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers. To be compliant with this section of the Code, which of the following examples best illustrates the written text of 110.16? The arc flash analysis determined that the incident energy at an industrial control panel is 6 cal/cm2. The industrial control panel will require troubleshooting, as well as testing for voltage by qualified persons.

    Answer:
    A) Beware. Shock boundary 36 in.
    B) Hot. Energized. Energized work permit required. Job briefing not required for testing and troubleshooting.
    C) Warning. Arc flash and shock hazard. Appropriate PPE required.
    D) Warning. Job briefing required before starting work. Limited approach boundary.

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


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    Shows and Events
    NEC Sessions Scheduled for 2006 NFPA World Safety Conference & Exposition
    The 12 sessions that make up the necforum are designed to help you consider new electrical design issues, analyze maintenance programs, review best practices in the electrical contracting arena, learn effective inspection techniques, and implement practical safety programs. If these topics interest you, then make plans to fly to Orlando in early June and take part in this year's event, which will be held from June 2-8, 2006. Visit the NFPA World Safety Web site for additional details.


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