Code Moves to Three-Year Revision Cycle
Learn Everything You
Need To Know About Arc Flash
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The designations "National Electrical Code" and "NEC" refer to
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
Top 2008 Code Changes
The requirements for a concrete-encased electrode now
include vertical electrodes as well as what to do when multiple
concrete-encased electrodes are present.
(A) Electrodes Permitted for Grounding.
(3) Concrete-Encased Grounding Electrode. A concrete-encased
electrode is an electrode that is encased by at least 2 inches of
concrete, located horizontally near the bottom or vertically within a
concrete foundation or footing that is in direct contact with the earth
consisting of one of the following:
If a moisture/vapor barrier is installed under a concrete footer, then
the steel rebar is not considered a concrete-encased electrode.
- Twenty feet of one or more bare or zinc galvanized or other
electrically conductive coated steel reinforcing bars bonded together
the usual steel tie wires not less than ½ inch in diameter, or
- Twenty feet of bare copper conductor not smaller than 4
Where multiple concrete-encased electrodes are present at a building
or structure, only one is required to serve as the grounding electrode
The grounding electrode conductor to a concrete-encased grounding
electrode isn't required to be larger than 4 AWG copper [250.66(B)].
The concrete-encased grounding electrode is also called a "Ufer
Ground," named after Herb Ufer, the person who determined its
usefulness as a grounding electrode in the 1960s. This type of
electrode generally offers the lowest ground resistance for the cost.
The requirements for concrete-encased electrodes have been expanded
to allow structural steel rebar in vertical foundations to be suitable
as a grounding electrode, as long as it meets all of the requirements
for horizontal structural steel rebar electrodes. In addition, the 2008
NEC clarified that in a building or structure where multiple isolated
concrete-encased electrodes are present, such as for spot footings,
one of these "present" electrodes will be required to be used. The
purpose of the NEC [90.1] is the "practical safeguarding of persons
and property," and requiring all of the concrete-encased electrodes
be bonded together served no safeguarding purpose.
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: Do you use protection?
By Mike Holt
Q. Our utility requires a nonfused disconnect
upstream of the meter and service disconnect for certain services. Is
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. When grounding the frames of metal-enclosed
power switchgear, which of the following methods listed here is the
one that is permitted by the 2008 NEC?
- A 6 AWG equipment bonding jumper from a nearby effectively grounded
- A 6 AWG grounding electrode conductor connected to a driven ground
rod adjacent to the equipment.
- GFPE protection (30mA trip setting).
- A properly sized equipment-grounding conductor.
Web site for the answer and explanation.
EasyPower delivers the easiest-to-use, most accurate
tools for designing, analyzing, and monitoring electrical power
Whether you're developing or implementing an Arc Flash Safety
Program, you can rely on ESA to help. Take advantage of our
free Arc Flash Videos, Arc Flash Book, Arc Flash Specification,
Ten Step Guide and more. Check out the quick links on our
website today! http://www.easypower.com
Code News Update
Canadian Electrical Code Moves to
Three-Year Revision Cycle
According to a news brief in the July/August 2008 issue
of Electrical Line magazine, a Canadian business trade
publication, the 21st edition of the Canadian Electrical Code, Part I
(CEC) in early 2009 will signal the beginning of its move from a
four-year to three-year cycle. One benefit of this change may be a
closer correlation between the CEC and the NEC. The new three-year
will also allow the Canadian Standards Association (CSA) -- publisher
of the CEC -- to more quickly accept new safety requirements and
product technologies available to the electrical market.
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
Learn Everything You Need To Know About Arc Flash
In two informative and interest-filled days, you'll learn about:
Whether you're an electrician, contractor, engineer, designer, or
plant/facility maintenance person, you can't afford to miss this
event. Symposium is scheduled to take place October 14-15 in Boston.
- Original Ralph Lee Paper Assumptions and Resulting
- Requirements for Development of an Arc Flash Analysis
- Conducting an Arc Flash Site Analysis
- Differences Between NFPA 70E and IEEE 1584
- Arc Flash Hazard Prevention by Design
- Software Tools and Arc Flash
- Calculating Arc Flash Energy Levels
- Low Voltage Shock Damage to Human Body
- Advancements in Personal Protective Equipment
- Case Studies of Arc Flash Hazard Mitigation
For more information and to register online, go to http://ecmuniversity.com/arc-flash-conferences/.
Do you need guidance navigating safety standards or
want to learn about new regulations? Learn from UL experts by attending
a UL University public workshop. Featured workshops include: CE
Strategies, Hazardous Locations, Specifying & Evaluating Plastic
Materials, IEC 60601-1, 2nd & 3rd Editions and many more. Register
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