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

90.4 Enforcement

What's Wrong Here?

Code Q&A

Code Quiz

NEC Sessions Scheduled for 2006 NFPA World Safety Conference & Exposition

About this Newsletter
This twice-a-month
e-newsletter is brought to you from the publisher of EC&M magazine.

CodeWatch will:

  • Let you know what could be changing in the Code®.
  • Help you brush up on your ability to apply the Code®.
  • Test your knowledge of the Code® with a Q&A format.
  • Provide information on upcoming Code® seminars and shows.
  • Give you an opportunity to sound off on Code®-related issues.

    We want to make sure we're providing you with the content you need to better manage your business or enhance your technical skills. E-mail us and let us know what you want to see in future issues of this e-newsletter. We will do our best to address your request in a future issue of CodeWatch.

  • Subscriptions
    To unsubscribe from this newsletter go to: Unsubscribe

    To subscribe to this newsletter, go to: Subscribe

    To get this newsletter in a different format (Text or HTML), or to change your e-mail address, please visit your profile page to change your delivery preferences.

    Back Issues
    Missed an issue? Visit the CodeWatch archive on EC&M's Web site.

    Tell a friend about CodeWatch
    Do you know of someone who'd like to receive CodeWatch? Visit the subscriber site, enter their e-mail address and spread the wealth!

    To find out how to advertise in this newsletter, e-mail David Miller or call him at (312) 840-8497.

    The designations "National Electrical Code” and “NEC” refer to the National Electrical Code®, which is a registered trademark of the National Fire Protection Association.



    Top 50 NEC Rules

    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

    Achieve Your
    Performance Goals

    Anticipate, prevent and troubleshoot motors, electrical and equipment maintenance with fast, accurate non-contact temperature measurements with Fluke infrared thermometers.

    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.

    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.

    Cool Electronic Cabinets
    Stop electronic control downtime due to heat, dirt and moisture. UL Listed Cabinet Coolers from EXAIR produce 20 degree Fahrenheit air from an ordinary supply of compressed air to cool electrical controls. Thermostat control minimizes air usage. Maintains the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web site offers detailed information, downloadable drawings and PDF literature.

    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.

    Connected & Protected
    IDEAL's new WeatherProof Wire Connectors are the fastest, easiest and safest way to connect wires in damp or wet locations. Pre-filled with a silicone-based sealant and UL listed to 486D, these connectors protect conductors from moisture, humidity and other corrosive elements. Visit to request a free sample.

    You are subscribed to this newsletter as #email#

    For questions concerning delivery of this newsletter, please contact our Customer Service Department at:
    Customer Service Department
    A Prism Business Media publication
    US Toll Free: 866-505-7173
    International: 847-763-9504

    Prism Business Media
    9800 Metcalf Avenue
    Overland Park, KS 66212

    Copyright 2006, Prism Business Media. All rights reserved. This article is protected by United States copyright and other intellectual property laws and may not be reproduced, rewritten, distributed, re-disseminated, transmitted, displayed, published or broadcast, directly or indirectly, in any medium without the prior written permission of Prism Business Media.