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

February 13, 2007 A Prism Business Media Publication Vol. V No. 3

Sizing the Grounding Electrode Conductor

What's Wrong Here?

Code Q&A

Code Quiz

The Need for Tamper-Resistant Wiring Devices

Enter the "You Be the Electrical Inspector" Contest at the EC&M e-Tradeshow

It's Time to Hit the Beach

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) 840-8487.

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




    Top 50 NEC Rules

    Sizing the Grounding Electrode Conductor

    By Mike Holt
    Except for a ground rod electrode [250.66(A)], a concrete-encased electrode [250.66(B)], or a ground ring electrode [250.66(C)], you must size the grounding electrode conductor based on the largest service-entrance conductor or equivalent area for parallel conductors in accordance with Table 250.66.

    Where the grounding electrode conductor is connected to a ground rod, that portion of the grounding electrode conductor that is the sole connection to the ground rod isn't required to be larger than 6 AWG copper. See 250.52(A)(5) for the installation requirements of a ground rod electrode.

    Where the grounding electrode conductor is connected to a concrete-encased electrode, that portion of the grounding electrode conductor that is the sole connection to the concrete-encased electrode isn't required to be larger than 4 AWG copper. See 250.52(A)(3) for the installation requirements of a concrete-encased electrode.

    Where the grounding electrode conductor is connected to a ground ring, that portion of the conductor that is the sole connection to the ground ring isn't required to be larger than the conductor used for the ground ring. A ground ring encircling the building or structure in direct contact with earth must consist of not less than 20 feet of bare copper conductor not smaller than 2 AWG [250.52(A)(4)].

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

    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: Attack of the terminations

    Code Q&A
    By Mike Holt
    Q. Does the Code require bonding around raceway knockouts for 120V, 208V, or 240V feeders and branch circuits?

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

    Code Quiz
    By Steven Owen
    Q. Raceways or cable trays containing electric conductors shall not contain which of the following?
    A) Pipe, tube or equal for steam, water, air or gas.
    B) Pipe, tube or equal for drainage.
    C) Any service other than electrical.
    D) All of the items listed in answers A, B, and C.

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

    One-touch automated design and one-touch automated protective device coordination options available in EasyPower 8.0! To watch a 3 minute EasyPower video, go to 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.

    Code News Update
    The Need for Tamper-Resistant Wiring Devices
    Proposal 18-40 of the 2008 NEC Report on Proposals calls for the addition of a new section to Art. 406. The new section (406.11) would require the installation of tamper-resistant receptacles in dwelling units. More specifically, the proposed wording would read: “In all areas specified in 210.52, all 125-volt, 15- and 20-ampere receptacles shall be listed tamper resistant receptacles.”

    According to a news item in the January 2007 issue of NEMA's Electroindustry, the submitter referenced a 10-year study by the National Electronic Injury Surveillance System -- a recording system of the Consumer Products Safety Commission -- in support of this proposal. The study documented approximately 24,000 electrical injuries to children caused by inserting objects into unprotected electrical receptacles.

    Members of Code-Making Panel No. 18 have voted 11 to 1 in favor of accepting this proposal.

    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

    Enter the "You Be the Electrical Inspector" Contest at the EC&M e-Tradeshow
    Here's your chance to win a $100 American Express gift certificate and to prove your knowledge of the National Electrical Code by acting as an electrical inspector and citing every Code violation appearing in an actual electrical installation. Visit the EC&M e-Tradeshow, a virtual online exhibition and live conference center. Also available is a live conference scheduled for February 15th on "Ground-Fault Coordination" and a special presentation by Generac on "Sizing Commercial Generators." And take a look at the archive of various past conferences, such as "Claim Litigation" and "Harmonics: Causes, Symptoms, and Remediation Techniques."

    It's Time to Hit the Beach
    If it's your job to make sure all systems are "go," you need to go to Electric West. This show and conference offers the right information and product mix to meet all of your information needs. Do you maintain and operate electrical systems in a facility? If so, you have to make plans to attend the Electric West conference program in Long Beach, Calif. Check out this event's 40+ seminars in the areas of power quality, safety, Code changes, and industrial applications, and make plans to meet 200+ leading suppliers. Or register now.

    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.