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

May 14, 2007 A Penton Media Publication Vol. V No. 9

Cast Your Vote Now!

250.122 Sizing Equipment Grounding (Bonding) Conductor

What's Wrong Here?

Code Q&A

Code Quiz

California Codes

EC&M Code Change Conferences

Don't Miss This FREE Live Session Scheduled for May 17th in the EC&M e-Tradeshow

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.




    EC&M Product of the Year Competition
    Cast Your Vote Now!
    Do you want the opportunity to win $100? Then visit the EC&M Web site by June 22 to cast your vote in EC&M's Product of the Year competition and help us identify the best new product introduced to the electrical industry in 2006.

    When you visit the EC&M Web site, an automatic poll will pop up. (Note: If you have a pop-up blocker program, it may prevent you from seeing the poll. Temporarily disable the program to allow the poll to appear on your computer.) You then need to type in your contact information, choose your favorite product, and click submit. It's that simple. For additional information on each category winner, click on the product name in the pop-up poll window, and it will bring you to a page that features product summaries for all 24 category winners.

    A panel of seven judges initially narrowed the field from 108 entrants down to 24 category winners. Now we need your help to determine the Platinum, Gold, and Silver Award winners. The competition has honored innovation and excellence in product development in the electrical industry for the past seven years.

    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.

    Top 50 NEC Rules

    250.122 Sizing Equipment Grounding (Bonding) Conductor

    By Mike Holt
    The equipment grounding (bonding) conductor must be sized in accordance with Table 250.122, based on the ampere rating of the circuit-protection device, but in no case is it required to be larger than the circuit conductors. Equipment grounding (bonding) conductors must be capable of safely conducting any ground-fault current likely to be imposed on them [110.10]. If the equipment grounding (bonding) conductor isn't sized to withstand the ground-fault current, the conductor may burn clear before the protective device responds.

    When ungrounded circuit conductors are increased in size for any reason, the equipment grounding (bonding) conductor must be proportionately increased in size. Ungrounded conductors could be increased in size to accommodate voltage drop, because of excessive heating from harmonic currents, fault current studies, or future capacity.

    When multiple circuits are installed in the same raceway or cable, only one equipment grounding (bonding) conductor is required. This conductor must be sized in accordance with Table 250.122, based on the largest overcurrent device protecting the circuit conductors.

    When circuit conductors are run in parallel [310.4], an equipment grounding (bonding) conductor must be installed with each parallel conductor set -- and it must be sized in accordance with (1) or (2).

    1. Based on the ampere rating of the circuit-protection device in accordance with Table 250.122.
    2. Based on the ampere rating of the ground-fault protection in accordance with Table 250.122 where ground-fault protection of equipment is installed if:
      • Maintenance and supervision ensure that only qualified persons will service the installation.
      • Ground-fault protection is set to trip at not more than the ampacity of a single ungrounded conductor.
    Equipment grounding (bonding) conductors for feeder taps must be sized in accordance with Table 250.122, based on the ampere rating of the circuit-protection device ahead of the feeder, but in no case is it required to be larger than the circuit conductors.

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

    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 Indianapolis, Indiana on September 17-21, 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.

    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: You've got mail

    Code Q&A
    By Mike Holt
    Q. Can I connect a range hood in a dwelling unit kitchen to the small appliance circuit?

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

    Code Quiz
    By Steven Owen
    Q. A contractor installed a 2,000A, 480V, 3-phase feeder in six separate raceways, consisting of a total of six 500kcmil XHHW insulated conductors per phase. Four of the raceways are 3-inch trade size EMT. The other two raceways are 3 1/2-inch RMC. All conductors are exactly the same length, per paralleled phase, and feature the same insulation type and conductor material. In addition, all are terminated in the same manner and have the same cross-sectional area. The inspector has turned this installation down. What could possibility make this installation non-Code compliant?

    1. Nothing. This installation is Code compliant.
    2. The raceways are not the same. You must change all raceway sizes to either 3 1/2-inch EMT or 3 1/2-inch RMC.
    3. The raceways are not the same. You must change all raceways to either EMT or RMC of the proper trade size.
    4. The installation has an incorrect number of conductors paralleled. Change the number of conductors per phase from six to five.

    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.

    Code News Update
    California Codes
    According to the April 2007 issue of NEMA's electroindustry, the California Building Standards Commission (CBSC) recently announced that all pertinent state agencies have completed their review of the appropriate model codes and have submitted their recommendations for amendments. The new 2007 California Electrical Code will be based on the 2005 NEC. The new code is scheduled to be published by July 1 2007, with enforcement taking place on January 1 2008.

    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.

    Don't Miss This FREE Live Session
    Scheduled for May 17th in the EC&M e-Tradeshow

    • "Understanding Ground Resistance Testing" presented by John Olobri, AEMC Instruments, 10:00 a.m. Eastern and Pacific time

    In today's rapidly changing world of technological advances, good grounding is more important than ever to prevent costly damage and downtime due to service interruptions and inoperative surge protection caused by poor grounds. Attend this live conference and learn about soil resistivity, ground resistance, 3- and 4-point measurements, and clamp-on measurements. This conference is a must for professional engineers, plant/facility electrical maintenance technicians, and electrical contractors and field technicians. Bring Your Questions!

    Before and after the conference session, visit the many exhibitors in this virtual tradeshow and take a look at the On-Demand Theater, where you can view past online webcasts 24/7/365.

    Go to for information on accessing the EC&M e-Tradeshow and attending this FREE live event.

    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 Penton Media publication
    US Toll Free: 866-505-7173
    International: 847-763-9504

    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.