View this email as a Web page Please add Code Watch to your Safe Sender list.

March 13, 2007 A Penton Media Publication Vol. V No. 5



CONTENTS
250.94 Grounding (Bonding) of Communications Systems

What's Wrong Here?

Code Q&A

Code Quiz

NEC Report on Comments Available Soon

EC&M Code Change Conferences


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!


    Advertising
    To find out how to advertise in this newsletter, e-mail David Miller or call him at 312-840-8487.

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

     
    ADVERTISEMENT



    ADVERTISEMENT




    ADVERTISEMENT


    Top 50 NEC Rules



















    250.94 Grounding (Bonding) of Communications Systems

    By Mike Holt
    An accessible bonding point must be provided at service equipment or the disconnecting means of separate buildings or structures for communications systems. The point can be any one of the following:
    1. An exposed, nonflexible metallic raceway.
    2. An exposed grounding electrode conductor.
    3. An external connection approved by the authority having jurisdiction.

      FPN No. 2: Communications systems must be bonded together.
      • Antennas / Satellite Dishes (810.21)
      • CATV (820.100)
      • Telephone Circuits (800.100)
    The bonding of all external communications systems to a single point minimizes the possibility of damage to the systems from potential (voltage) difference between the systems.

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


    ADVERTISEMENT
    Fluke 117 Electrician's Multimeter with Non-Contact voltage. Designed by electricians. Engineered by Fluke.
    Compact true-rms meter for commercial applications. The Fluke 117 is the ideal meter for demanding settings like commercial buildings, hospitals and schools. The 117 includes integrated non-contact voltage detection to help get the job done faster. For more information, click here.


    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: Full service door


    Code Q&A
    By Mike Holt
    Q. I'm running a 4-wire lighting circuit with a shared neutral. Can I use three single-pole breakers without handle ties?

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


    Code Quiz
    By Steven Owen
    Q. Where a surge arrester is installed on a circuit operating at less than 1,000V, it shall comply with all but which of the following?

    1. The rating of the surge arrester shall be equal to or greater than the maximum continuous phase-to-ground power frequency voltage available at the point of application.
    2. The surge arrester shall be identified for the application.
    3. Surge arresters 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. Surge arresters shall not be installed on ungrounded systems, impedance grounded systems, or corner grounded delta systems unless listed specifically for use on these systems.

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


    ADVERTISEMENT
    One-touch automated design and one-touch automated protective device coordination options, available in EasyPower 8.0, will be introduced in the Hands-On training in Portland, OR April 30 -- May 4, 2007! Streamline the implementation of your Arc Flash and Electrical Safety Program. What used to take hours, now takes mere seconds! EasyPower delivers Windows®-based tools for designing, analyzing, and monitoring electrical power systems.
    www.easypower.com/support_training.php


    Code News Update
    NEC Report on Comments Available Soon
    The 2007 NEC Annual Revision Cycle Report on Comments will be made available a week from this Friday, on March 23. You can 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.


    ADVERTISEMENT
    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.
    www.exair.com/15/540_03a.htm


    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. Plans are currently underway to present seven Code change conferences 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.

    Hotel and registration information will be announced soon!

    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
    EC&M
    A Penton Media publication
    US Toll Free: 866-505-7173
    International: 847-763-9504
    Email:ecmweb@pbinews.com

    Penton | 1166 Avenue of the Americas, 10th Floor | New York, NY 10036

    Copyright 2014, Penton. 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 Penton Media, Inc.