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

August 14, 2006 A Prism Business Media Publication Vol. IV No. 15



CONTENTS
Introducing the EC&M
E-Tradeshow

240.6 Standard Ampere Ratings

What's Wrong Here?

Code Q&A

Code Quiz

Call for Comments


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) 840-8497.

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

     
    ADVERTISEMENT



    ADVERTISEMENT



    EC&M E-Tradeshow
    Introducing the EC&M
    E-Tradeshow

    EC&M magazine's new online tradeshow and conference series is now open! Use it as often as you like at no cost to you. The E-tradeshow is a 3D exhibition where you can examine some of the latest in electrical products, meet with exhibitors, and gather information. Plus, you'll be able to attend conference seminars inside the E-Tradeshow throughout the year.

    Just click here and you'll be connected to detailed information about how to get inside and make full use of the E-tradeshow. In minutes you'll be exploring in the 3D environment, be visiting in our charter exhibitors' booths, and checking out some very cool products.

    See you in the show!



    ADVERTISEMENT
    Achieve Your
    Performance Goals

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


    Top 50 NEC Rules















    240.6 Standard Ampere Ratings

    By Mike Holt
    The standard ratings in amperes for fuses and inverse-time breakers are: 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1,000, 1,200, 1,600, 2,000, 2,500, 3,000, 4,000, 5,000 and 6,000. Additional standard ampere ratings for fuses include 1, 3, 6, 10, and 601.

    Fuses rated less than 15A are sometimes required for the protection of fractional horsepower motor circuits [430.52], motor control circuits [430.72], small transformers [450.3(B)], and remote-control circuit conductors [725.23].

    The ampere rating of an adjustable circuit breaker is equal to its maximum long-time pickup current setting.

    The ampere rating of adjustable-trip circuit breakers that have restricted access to the adjusting means is equal to their adjusted long-time pickup current settings.

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


    ADVERTISEMENT
    ARC FLASH SAFETY EMPHASIS WEEK IN BOSTON, MA | OCTOBER 2-6, 2006

    Discover the theory & practical aspects required to implement an Arc Flash study & safety training program. Join us for a week of Arc Flash Hazard concentration including --
    • EasyPower® 8.0 Hands-On with ArcFlash
    • NFPA 70E Safety Training
    • Simulated Arc Flash with IEEE-1584 Testing
    Register online or download a brochure.


    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: Something seems to be missing here.

    Code Q&A
    By Mike Holt
    Q. What type of fitting can I use to terminate ground wires in a metal box?

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

    Code Quiz
    By Steven Owen
    Q. What is the maximum number of 12 AWG THHN insulated conductors permitted in a strut-type channel raceway that is 1 1/2 inches by 1 1/2 inches and of unlimited length? The channel location is defined as indoors and dry. The ambient temperature does not exceed 30°C. The raceway sections of this strut-type channel are joined with external joiners.

    A) 54
    B) 55
    C) 34
    D) 35

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


    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_08a.htm


    Speak Out
    Call for Comments
    The following Tentative Interim Amendment (TIA Log No. 822) to the 2005 NEC has been proposed to the NFPA. The TIA is now open for public review and comment. All comments on this proposed change should be filed with the Secretary, Standards Council, by September 20, 2006. The Standards Council will review any and all information submitted and then determine whether or not to issue the TIA at its November 3, 2006 meeting.

    The TIA proposes new wording for the ampacity of conductors in cellular metal floor raceways. The existing wording and proposed wording are shown here for your benefit.

    Existing Wording:
    "374.17 Ampacity of Conductors. The ampacity adjustment factors in 310.15(B)(2) shall apply to conductors installed in cellular metal floor raceways."

    Proposed Wording:
    "374.17 Ampacity of Conductors. In addition to all other requirements of Article 374 of the NEC, the ampacity adjustment factors in 310.15(B)(2) shall apply to current-carrying conductors installed in headers with internal dimensions of less than 9 square inches.
    "The ampacity adjustment factors in 310.15(B)(2) shall also apply to current-carrying conductors installed in cells, except that cells having internal dimensions in excess of 5.5 square inches shall be permitted to contain up to 30 current-carrying conductors of #10 size without ampacity reduction, and cells having internal dimensions in excess of 15 square inches shall be permitted to contain up to 75 current-carrying conductors of #10 size without ampacity reduction."

    The submitter's reason behind this proposed change is noted in the August 2006 issue of NFPA News (page 3).


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

    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.