Cast Your Vote
Sizing Equipment Grounding (Bonding) Conductor
Don't Miss This FREE
Scheduled for May 17th in the EC&M e-Tradeshow
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. 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
Sizing Equipment Grounding (Bonding) Conductor
By Mike Holt
The equipment grounding (bonding) conductor must be
sized in accordance with Table 250.122, based on the ampere rating of
the circuit-protection device, but in no case is it required to be
larger than the circuit conductors. Equipment grounding (bonding)
conductors must be capable of safely conducting any ground-fault
likely to be imposed on them [110.10]. If the equipment grounding
(bonding) conductor isn't sized to withstand the ground-fault current,
the conductor may burn clear before the protective device responds.
When ungrounded circuit conductors are increased in size for any
reason, the equipment grounding (bonding) conductor must be
proportionately increased in size. Ungrounded conductors could be
increased in size to accommodate voltage drop, because of excessive
heating from harmonic currents, fault current studies, or future
When multiple circuits are installed in the same raceway or cable,
only one equipment grounding (bonding) conductor is required. This
conductor must be sized in accordance with Table 250.122, based on the
largest overcurrent device protecting the circuit conductors.
When circuit conductors are run in parallel [310.4], an equipment
grounding (bonding) conductor must be installed with each parallel
conductor set -- and it must be sized in accordance with (1) or
- Based on the ampere rating of the circuit-protection device in
accordance with Table 250.122.
- Based on the ampere rating of the ground-fault protection in
accordance with Table 250.122 where ground-fault protection of
is installed if:
Equipment grounding (bonding) conductors for feeder taps must be sized
in accordance with Table 250.122, based on the ampere rating of the
circuit-protection device ahead of the feeder, but in no case is it
required to be larger than the circuit conductors.
- Maintenance and supervision ensure that only qualified persons will
service the installation.
- Ground-fault protection is set to trip at not more than the
of a single ungrounded conductor.
Editor's note: This information was extracted from Mike
the National Electrical Code
One-touch automated design and one-touch
automated protective device coordination options, available in
8.0, will be introduced in the Hands-On training in Indianapolis,
Indiana on September 17-21, 2007! Streamline the implementation of
your Arc Flash and Electrical Safety Program. What used to take hours,
now takes mere seconds! EasyPower delivers
designing, analyzing, and monitoring electrical power systems.
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: You've got mail
By Mike Holt
Q. Can I connect a range hood in a dwelling unit
kitchen to the small appliance circuit?
Web site to see the answer.
By Steven Owen
Q. A contractor installed a 2,000A, 480V,
feeder in six separate raceways, consisting of a total of six 500kcmil
XHHW insulated conductors per phase. Four of the raceways are 3-inch
trade size EMT. The other two raceways are 3 1/2-inch RMC. All
conductors are exactly the same length, per paralleled phase, and
feature the same insulation type and conductor material. In addition,
all are terminated in the same manner and have the same cross-sectional
area. The inspector has turned this installation down. What could
possibility make this installation non-Code compliant?
- Nothing. This installation is Code compliant.
- The raceways are not the same. You must change all raceway sizes to
either 3 1/2-inch EMT or 3 1/2-inch RMC.
- The raceways are not the same. You must change all raceways to
either EMT or RMC of the proper trade size.
- The installation has an incorrect number of conductors paralleled.
Change the number of conductors per phase from six to five.
Web site for the answer and explanation.
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.
Code News Update
According to the April 2007 issue of NEMA's
electroindustry, the California Building Standards Commission
recently announced that all pertinent state agencies have completed
their review of the appropriate model codes and have submitted their
recommendations for amendments. The new 2007 California Electrical
Code will be based on the 2005 NEC. The new code is scheduled to be
published by July 1 2007, with enforcement taking place on January 1
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
Don't Miss This FREE Live Session
Scheduled for May 17th in the
- "Understanding Ground Resistance Testing" presented by John
Olobri, AEMC Instruments, 10:00 a.m. Eastern and Pacific time
In today's rapidly changing world of technological advances, good
grounding is more important than ever to prevent costly damage and
downtime due to service interruptions and inoperative surge protection
caused by poor grounds. Attend this live conference and learn about
resistivity, ground resistance, 3- and 4-point measurements, and
clamp-on measurements. This conference is a must for professional
engineers, plant/facility electrical maintenance technicians, and
electrical contractors and field technicians. Bring Your Questions!
Before and after the conference session, visit the many exhibitors
this virtual tradeshow and take a look at the On-Demand Theater, where
you can view past online webcasts 24/7/365.
Go to http://www.ecmweb.com/etradeshow/index.html
information on accessing the EC&M e-Tradeshow and attending this
FREE live event.
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 | 1166 Avenue of the Americas, 10th Floor | New York, NY 10036
Copyright 2014, Penton. 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.