Requirements for Grounding and Bonding
Minnesota Ready to
Adopt 2008 NEC
Learn About the
Changes in the 2008 National Electrical Code
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Top 2008 Code Changes
Requirements for Grounding and Bonding
By Mike Holt
A new Fine Print Note alerts Code users to the
of reducing the length of the grounding electrode conductor.
"250.4(A) Grounded Systems, (1) Electrical Systems Grounding.
Electrical power systems, such as the secondary winding of a
transformer, are grounded to the earth to limit the voltage caused by
lightning, line surges, or unintentional contact by higher-voltage
"FPN: An important consideration for limiting the imposed voltage is
the routing of bonding and grounding conductors so that they are not
longer than necessary to complete the connection without disturbing the
permanent parts of the installation and so that unnecessary bends and
loops are avoided."
System grounding helps reduce fires in buildings as well as voltage
stress on electrical insulation, thereby ensuring longer insulation
for motors, transformers, and other system components. This new Fine
Print Note is intended to call attention to the instructions contained
in Sections 800.100(A)(5), 810.21(E), and 820.100(A)(5) that grounding
conductors be run as short as possible and as straight as possible.
provides an effective path to earth for line surges caused by lightning
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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: Politics in the electrical system
By Mike Holt
Q. Is a disconnect required to be within sight
electric space-heating equipment if the unit has a factory-installed
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. According to the 2008 National Electrical
Code, electric drinking fountains installed in public buildings, such
schools, must meet which of the following requirements:
- Offer GFCI protection for personnel -- Class A, 5mA (nominal) trip
- Can't be supplied with a hermetic compressor
- Offer GFCI protection only if it is located within 6 feet of a 15A
or 20A, 125V single-phase receptacle outlet
- Offer GFPE protection -- Class C, 30mA trip
- none of the above
Web site for the answer and explanation.
Streamline the implementation of your Arc Flash and
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Experience the most accurate Windows®-based tools for
designing, analyzing, and monitoring electrical power systems:
EasyPower training will be in Atlanta, Georgia, October 6-10,
2008. This seminar fills up quickly; download a brochure and
September 22nd! http://www.easypower.com/support_training.php
Code News Update
Minnesota Ready to Adopt 2008
According to information posted on the Minnesota
Department of Labor & Industry Web site, the effective date of the 2008
National Electrical Code in the state of Minnesota will be Sept.15,
2008. All installations where the Request for Electrical Inspection is
filed with the department on or after Sept. 15, 2008 will be required
be in compliance with the 2008 National Electrical Code. In addition,
all electrical licensing examinations administered on or after Sept.
15, 2008 will be based on the 2008 National Electrical Code. Other
information related to the adoption of the 2008 National Electrical
can be accessed at www.oah.state.mn.us/cases/190019553-electric/index.html.
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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 About the Changes in the 2008 National Electrical Code
In two informative and interest-filled days with Mike Holt,
you'll learn about major NEC changes that will impact your work,
you're an electrician, contractor, engineer, designer, or
maintenance person. You'll also earn continuing education hours and
professional development hours.
There's still one more conference to be held this year:
--September 8-9 in San Antonio
For more information and to register online, go to http://CodeChangeConferences.com
The National Fire Protection Association (NFPA) is
accepting proposals for educational presentations at its 2009
& Expo to be held June 8-11 at McCormick Place in Chicago. The deadline
is fast approaching (September 19, 2008), but you still have time to
submit your proposal online
or download a proposal
Do you need guidance navigating safety standards or
want to learn about new regulations? Learn from UL experts by
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