Cast Your Vote
Use of Grounded Neutral Conductor for Equipment Grounding (Bonding)
Let's Go Racing! Win
a Free Road America Race Weekend for Two
About this Newsletter
e-newsletter is brought to you from the
publisher of EC&M magazine.
Let you know what could be changing in the Code®.
Help you brush up on your ability to apply the
Test your knowledge of the Code® with a Q&A format.
Provide information on upcoming Code® seminars and
Give you an opportunity to sound off on
We want to make sure we're providing you with the content you need to
better manage your business or enhance your technical skills. E-mail us and let us know
what you want to see in future issues of this e-newsletter. We will do
our best to address your request in a future issue of CodeWatch.
To unsubscribe from this newsletter go to: Unsubscribe|
To subscribe to this newsletter, go to: Subscribe
To get this newsletter in a different format (Text or HTML),
or to change your e-mail address, please visit your profile
page to change your delivery preferences.
issue? Visit the
CodeWatch archive on EC&M's Web site.|
Tell a friend about CodeWatch
Do you know
of someone who'd like to receive CodeWatch? Visit the subscriber site, enter
their e-mail address and spread the wealth!|
To find out
how to advertise in this newsletter, e-mail David Miller or call him at
The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
EC&M Product of the Year Competition
Cast Your Vote Now!
Do you want the opportunity to win $100? Then visit the
EC&M Web site by June 22 to
your vote in EC&M's Product of the Year competition and help us
identify the best new product introduced to the electrical industry in
When you visit the EC&M Web
site, an automatic poll will pop up. (Note: If you have a pop-up
blocker program, it may prevent you from seeing the poll. Temporarily
disable the program to allow the poll to appear on your computer.) You
then need to type in your contact information, choose your favorite
product, and click submit. It's that simple. For additional information
on each category winner, click on the product name in the pop-up poll
window and it will bring you to a page that features product summaries
for all 24 category winners.
A panel of seven judges initially narrowed the field from 108
entrants down to 24 category winners, and now we need your help to
determine the Platinum, Gold, and Silver Award winners. The competition
has honored innovation and excellence in product development in the
electrical industry for the past seven years.
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
Use of Grounded Neutral Conductor for Equipment Grounding
By Mike Holt
To remove dangerous voltage on metal parts from a
fault, the metal parts of electrical raceways, cables, enclosures, and
equipment must be bonded to an effective ground-fault current path in
accordance with 250.4(A)(3).
Supply side of service equipment. A grounded neutral
can be used as the effective ground-fault current path for metal parts
of equipment, raceways, and other enclosures. Because an equipment
grounding (bonding) conductor isn't run from the utility to electrical
services, the grounded neutral service conductor can serve as the
effective ground-fault current path to the utility power source. The
effective ground-fault current path for service equipment is provided
the installation of the main bonding jumper at service equipment in
accordance with 250.24(B) [250.28].
Where no equipment grounding (bonding) conductor is run to a
building or structure disconnect, the grounded neutral conductor can
serve as the effective ground-fault current path to the source. This is
accomplished by bonding the grounded neutral conductor to the equipment
grounding (bonding) conductor at the separate building or structure
building disconnecting means in accordance with 250.32(B)(2).
Caution: Using the grounded neutral conductor as effective
ground-fault current path poses potentially dangerous consequences and
should only be done after careful consideration. The safest practice is
to install an equipment grounding (bonding) conductor with the feeder
conductors to the building or structure to serve as the effective
ground-fault current path, as provided by 250.32(B)(1).
On a separately derived system, the effective ground-fault current
path is established when the system bonding jumper is installed between
the metal enclosure of the separately derived system and the grounded
neutral terminal in accordance with 250.30(A)(1). Failure to install
system bonding jumper as required by 250.30(A)(1) will create a
condition where dangerous touch voltage from a ground fault will remain
on the metal parts of electrical equipment.
Load side equipment. To prevent dangerous voltage on metal
parts, the grounded neutral conductor must not be bonded to the
equipment grounding (bonding) conductor on the load side of service
equipment, except as permitted by 250.142(A).
Exception No. 1: The grounded neutral conductor can serve as the
effective ground-fault current path for existing ranges, dryers, and
ovens [250.140 Ex].
Exception No. 2: The grounded neutral conductor can be bonded to the
meter enclosure on the load side of the service disconnecting means
- No service ground-fault protection is installed,
- Meter enclosures are located immediately adjacent to the service
disconnecting means, and
- The grounded neutral conductor is sized no smaller than specified
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
to help you determine what you need 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
What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
Web site to see the answer.
Hint: Power in a pinch
By Mike Holt
Q. Can I install conductors from different
in the same raceway?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. What is the minimum size and metal thickness
required for a junction box constructed of sheet steel, with one 4-inch
RMC conduit (per wall) connected on opposite walls of the box (i.e.,
directly across from one another)? The conductors within the raceways
are 600kcmil type XHHW. The outer diameter (O.D.) of each of these
insulated conductors is 1.2 inches.
- 24 inch by 24 inch. There is no requirement for metal thickness.
- 32 inch by 24 inch. Metal thickness = 1.35 millimeters (0.053
- 32 inch by 32 inch. Metal thickness = 1.35 millimeters (0.053
- 43.2 inches by 43.2 inches. Metal thickness = 1.35 millimeters
Web site for the answer and explanation.
Cool Electronic Cabinets
Summer will be here soon! Prevent hot weather failures. EXAIR Cabinet
Coolers are the low cost way to purge and cool electronic controls with
20 degree Fahrenheit air. All models are UL Listed and maintain the
4, 4X or 12 rating of the enclosure. Many cooling capacities are
available. Web site offers detailed information, downloadable drawings
and PDF literature. EXAIR Corporation
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
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
Kettle Moraine area, Road America is a four-mile permanent road course
that tests drivers with 14 challenging turns.
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.
You are subscribed to this newsletter as #email#
For questions concerning delivery of this newsletter, please contact
Customer Service Department at:
Customer Service Department
A Penton Media publication
US Toll Free: 866-505-7173
Penton Media, Inc. | 1166 Avenue of the Americas, 10th Floor | New York, NY 10036
Copyright 2013, Penton Media, Inc. All rights reserved. This article is
protected by United States copyright and other intellectual property
laws and may not be reproduced, rewritten, distributed,
displayed, published or broadcast, directly or indirectly, in any
without the prior written permission of Penton Media, Inc.