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August 13, 2007 A Penton Media Publication Vol. V No. 15

300.12 Mechanical Continuity

What's Wrong Here?

Code Q&A

Code Quiz

Better Late Than Never

EC&M Code Change Conferences

Mitigating Harmonics in Commercial Environments

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    Top 50 NEC Rules

    300.12 Mechanical Continuity

    By Mike Holt
    Raceways and cable sheaths must be mechanically continuous between boxes, cabinets, and fittings. The only exception to this rule is for short sections of raceways used to provide support or protection of cable from physical damage. These short sections are not required to be mechanically continuous [250.86 Ex. 2 and 300.10 Ex. 1].

    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: See-through conduit?

    Code Q&A
    By Mike Holt
    Q. Can I use aluminum rigid metal conduit in a Class 1, Div. I hazardous (classified) location?

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

    Code Quiz
    By Steven Owen
    Q. What is the load on the service for 10 office trailers on a construction site? Each unit is identical, featuring 1,548 square foot of usable floor area. The actual number of receptacles is not known. The heating load for each unit is rated at 7kW. The cooling load for each unit is rated at 7.5 hp. Both units are 3-phase, 208VAC. The supply voltage is 208VAC, 3-phase. The construction site for these office trailers is located in southern Texas.

    1. 170,746VA
    2. 85,373VA
    3. 56,637VA
    4. 46,101VA

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

    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. Register now for the EasyPower training coming to Orlando, Florida November 5 - 9, 2007! One-touch automated design and one-touch automated protective device coordination options, will also be introduced!

    Code News Update
    Better Late Than Never
    Although the release date for the 2008 NEC is right around the corner, some states are just now getting around to enforcement of the 2005 NEC. According to the July 2007 issue of NEMA's electroindustry, the South Carolina Building Code Council recently ordered that the 2005 NEC be implemented for mandatory enforcement by all South Carolina jurisdictions as of July 1, 2007. This follows an 18-month waiting period for public comment and local jurisdictional input that began back on February 22, 2006. The Code was adopted in full with one modification. Per the requirements of 210.12(B), 120V outlets powering individual station smoke alarms are not required to have arc-fault circuit interrupter protection in dwelling bedrooms.

    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
    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.

    Mitigating Harmonics in Commercial Environments
    This free live conference will be presented by John DeDad, EC&M magazine, on August 16th at 10 a.m. Eastern and Pacific times, in the EC&M e-Tradeshow. To gain access to the event, go to, sign in or register as an attendee, and follow the signs to the presentation room. And be sure to take a look at the On-Demand Theater, where you can view past online conferences 24 hours a day, 7 days a week, and 365 days a year.

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