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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
Unused openings for circuit breakers and switches must
be closed using identified closures, or other means approved by the
authority having jurisdiction, that provide substantially
equivalent to the wall of the enclosure.
Editor's note: This information was extracted from Mike
the National Electrical Code
The Fluke 1735 Power Logger is the ideal electrician or technician's
power meter for conducting energy studies and basic power quality
logging. Set the Power Logger up in seconds with the included flexible
current probes and color display. The power quality meter measures most
electrical power parameters, harmonics, and captures voltage events. www.fluke.com/codewatch
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: Silly support.
By Mike Holt
Q. Section 110.14(C) requires the use of the
60°C column for 100A or less and the 75°C column for above
100A for conductor sizing. What is the value of THHN rated 90°C if
the ampacity cannot be used for conductor sizing?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. Excluding exceptions, which one of the
following locations does not require GFCI protection for 15A and 20A,
125V single-phase receptacles?
- bathroom (anywhere)
- within 6 feet of a sink in a commercial or industrial facility
- electric drinking fountain
- outdoors on a commercial building
- cord-and-plug connected vending machines
- outdoors and in or on a floating building or structure within the
electrical datum plane
- within 20 feet of a decorative fountain
- in aircraft hangars where electric diagnostic equipment, electrical
hand tools or portable lighting equipment are used
- in commercial garages where electric diagnostic equipment,
electrical hand tools or portable lighting equipment are used
- dwelling unit attics, in accordance with 210.63
Web site for the answer and explanation.
Need help defining the parameters of your facility's next Arc
Flash Hazard Evaluation? ESA's electrical engineers have written a
detailed specification to help you determine what you need for your
study. This Arc Flash tool is provided in a Word document that can be
easily customized to include your facility's unique requirements.
Request your Free Arc Flash Study Specification: Click
Code News Update
Michigan Electrical Code
In late November 2007, Michigan adopted the 2005
Michigan Electrical Code. According to the December 2007 issue of
electroindustry, the state exempted the following sections of
2005 NEC: 501.30(B), 502.30(B), 503.30(B), 505.25(B), 506.25(B), 547.1
to 547.10, and Annex G. It also amended the following sections of the
2005 NEC: 230.40, 230.71(A), 250.118, 300.3(B), 334.10, 348.60, and
350.60. It's important to note that Michigan does not allow flexible
metal conduit or liquidtight flexible metal conduit to serve as an
equipment conductor. The full text of the amended sections may be
in this PDF
Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. EXAIR
Cabinet Coolers produce 20 degree Fahrenheit air from an ordinary
of compressed air to cool electrical controls. Thermostat control
minimizes air usage. UL Listed. 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
Year after year, electrical contractors, consultants,
engineers, plant managers, and other electrical professionals make it
their business to stay on top of the latest industry developments by
attending the Electric West Conference program, schedule for Las Vegas
from Feb. 27-29. It provides the tools you need to become more
efficient, work faster, more profitably and stay ahead of the
competition. Categories include:
For 2008, the Power
Quality segment will be expanded into its own separate conference. For
more information and to register, visit the Electric West Web
- Code Changes &
- Industrial Applications
- Home Automation
Eliminate Red Tags
It takes more than the UL Mark on a product to satisfy code
requirements. Before your next installation, use UL's Code Compliance
Database to identify the correlation between model codes and UL
Certified products, as well as find manufacturers of certified
Click here today
find up-to-date UL Listed products at the UL Code Correlation Database.
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