Better Late Than
Harmonics in Commercial Environments
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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
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
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
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.
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?
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.
By Steven Owen
Q. What is the load on the service for 10 office
trailers on a construction site? Each unit is identical, featuring
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.
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.
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
required to have arc-fault circuit interrupter protection in dwelling
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
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
of our 2008 Code change conferences will receive Professional
Development Hours (PDHs), a requirement for re-licensing in many
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
Mitigating Harmonics in Commercial
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 www.ecmweb.com/etradeshow,
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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