Let's Go Racing! Win a Free Road
America Race Weekend for Two
EC&M Code Change
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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.
300.5 Underground Installations
In the previous issue of CodeWatch, Mike Holt's Top 50
NEC Rules item focused on the topic of underground installations. Item
(1) focused on the protection of direct buried conductors and cables
emerging from grade. The second sentence in this paragraph read as
follows: "Protection isn't required to extend more than 18 inches below
grade, and protection above grade must extend to a height not less than
18 feet." As many of you most likely noted, the "18 feet" reference is
incorrect. The correct minimum height is "8 feet." The editors would
like to apologize to the author and the subscribers for this error.
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.
Top 50 NEC Rules
By Mike Holt
All metal raceways, cable, boxes, fittings, cabinets,
and enclosures for conductors must be metallically joined together
(bonded) to form a continuous low-impedance fault-current path that is
capable of carrying any fault current likely to be imposed on it
[110.10, 250.4(A)(3), and 250.122]. Metal raceways and cable assemblies
must be mechanically secured to boxes, fittings, cabinets, and other
Exception 1: Short lengths of metal raceways used for the
support or protection of cables aren't required to be electrically
continuous, nor are they required to be bonded to an effective
ground-fault current path [250.86 Ex. 2 and 300.12 Ex.].
Editor's note: This information was extracted from Mike
the National Electrical Code
Need help defining the parameters of your facility's next Arc
Flash Hazard Evaluation? ESA's electrical engineers have written a
detailed, customizable specification to help you determine what you
for your study. This Arc Flash tool is provided in a Word document that
can be easily updated with your facility's unique requirements. Request
your Free Arc
Flash Study Specification.
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: I stayed at a Holiday Inn last night!
By Mike Holt
Q. In a dwelling unit, what are the receptacle
requirements for island counter tops?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. When installing metal-armored cables and
raceways, is it permissible to connect a metal-armored cable or a metal
raceway to a nonmetallic box?
- Yes, as long as the armored cable is BX cable or equivalent. There
is an internal equipment grounding conductor, however, there is no
internal bonding means available to bond the armored cables together.
- Yes, as long as the raceway is flexible metal conduit or liquidtite
flexible metal conduit installed in a length not to exceed 6 feet.
is no internal equipment grounding conductor or and no bonding means
available to bond the cables together.
- Yes. Where internal bonding means are provided between all entries,
nonmetallic boxes shall be permitted to be used with metal raceways or
- No way! This is not going to happen according to the rules of the
Web site for the answer and explanation.
Cool Electronic Cabinets
Beat the heat and prevent hot weather failures. UL Listed Cabinet
Coolers from EXAIR produce 20 degree Fahrenheit air from an ordinary
supply of compressed air to cool electrical controls. Thermostat
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
Let's Go Racing!
Win a Free Road America Race Weekend for Two
EC&M magazine and Generac Power Systems have
teamed up to offer an expenses-paid weekend (August 10-12, 2007)
featuring two of the world's fastest racing series. The third annual
Generac Power Weekend is one thrilling day of American LeMans series
racing (the Generac 500) and an equally exciting day of Champ Car
at its finest (the Generac Grand Prix). It's your chance to see both
series compete in a single weekend at one of North America's most
beautiful tracks. Located in the hilly heart of Wisconsin's scenic
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Enter by July 10, 2007. Visit the Generac Power Systems virtual
at the EC&M
E-Tradeshow. Full contest rules are available online in the Generac
E-Tradeshow booth. For more information about the Generac Power
go to www.roadamerica.com.
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
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