Confusion Over Rod Size
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
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.
Top 50 NEC Rules
By Mike Holt
As per section A of this requirement, the following
metal parts must be service bonded to an effective ground-fault current
path in accordance with 250.92(B):
The metal raceway containing the grounding electrode conductor must be
effectively bonded in accordance with 250.64(E). Raceways or enclosures
containing feeder and branch-circuit conductors are not required to be
service bonded in accordance with 250.92(B).
- Metal raceways containing service conductors.
- Enclosures containing service conductors.
- A metal raceway containing the grounding electrode
As per section B of this requirement, enclosures and raceways
containing service conductors must be bonded to an effective
ground-fault current path by one of the following methods:
Editor's note: This information was extracted from Mike Holt's
the National Electrical Code
- Grounded Neutral Conductor. Enclosures and raceways
containing service conductors are considered bonded to an effective
ground-fault current path by bonding to the grounded neutral service
conductor via the main bonding jumper. The bonding must be by
welding, listed pressure connectors, listed clamps, or other listed
A main bonding jumper is required to bond the service disconnect to
the grounded neutral service conductor [250.24(B) and 250.28]. At
service equipment, the grounded neutral service conductor is used to
provide the effective ground-fault current path to the power source
[250.24(C)]. Therefore, an equipment grounding (bonding) conductor
required to be installed within a non-metallic raceway containing
service-entrance conductors [250.142(A)(1) and 352.60, Ex. 2] (see
- Threaded Fittings or Entries. Raceways containing service
conductors are considered bonded to an effective ground-fault current
path by threaded couplings or threaded entries on enclosures where made
- Threadless Fitting. Raceways containing service conductors
are considered bonded to an effective ground-fault current path by
threadless raceway couplings and connectors where made up
- Bonding Fitting. When a metal service raceway terminates to
an enclosure with a ringed knockout, a listed bonding device, such as a
bonding wedge or bushing, must bond one end of the service raceway with
a bonding jumper sized in accordance with Table 250.66 [250.92(B)(4)
When a metal raceway containing service conductors terminates to an
enclosure without a ringed knockout, a bonding-type locknut can be used
instead of a bonding wedge or bushing. A bonding-type locknut differs
from a standard-type locknut in that it has a bonding screw with a
point that drives into the metal enclosure to ensure a solid
termination. Bonding one end of a service raceway in accordance with
250.92(B) provides the low-impedance fault-current path to the utility
electrical supply source.
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.
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 hear a fire truck siren?
By Mike Holt
Q. If the secondary conductors of a transformer
are less than 10 feet in length, do the secondary conductors have to
terminate in a main breaker?
Web site to see the answer.
By Steven Owen
Q. When cutting and threading rigid metal
conduit, intermediate metal conduit and stainless steel conduit in the
"field", which one of the aforementioned conduits is not required to
have its threads protected with an approved electrically conductive
A) Rigid metal conduit.
B) Intermediate metal conduit.
C) Stainless steel conduit.
D) None of these conduit types are required to be protected with
an approved electrically conductive corrosion-resistant compound.
Web site for the answer and explanation.
One-touch automated design and one-touch automated protective device
coordination options, available in EasyPower 8.0, will be introduced in
the Hands-On training in Portland, OR April 30 -- May 4, 2007!
Streamline the implementation of your Arc Flash and Electrical Safety
Program. What used to take hours, now takes mere seconds! EasyPower
delivers Windows®-based tools for designing, analyzing,
and monitoring electrical power systems.
Code News Update
Eliminating Confusion Over Rod
Installers and inspectors alike have been confused over
the requirements of 250.52(A)(5) -- more specifically with regard to
diameter of the rod. In an effort to eliminate this confusion,
Code-Making Panel 5 has accepted in principle proposal 5-160 for the
2008 NEC. If adopted, the new section would read as follows:
"Rod and pipe electrodes shall not be less than 2.44 m (8 ft) in
length and shall consist of the following materials.
(a) Grounding electrodes of pipe or conduit shall not be smaller
metric designator 21 (trade size 3/4), and where of steel, shall have
the outer surface galvanized or otherwise metal-coated for corrosion
(b) Grounding electrodes of stainless steel, copper, or zinc-coated
steel shall be at least 15.87 mm (5/8 in.) in diameter unless listed
not less than 12.70 mm (1/2 in.) in diameter."
EXAIR's low cost Cabinet Coolers stop electronic control downtime due
heat, dirt and moisture. UL Listed Cabinet Coolers 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
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. Plans are currently underway to present seven Code
conferences 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.
Hotel and registration information will be announced soon!
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 Prism Business Media publication
US Toll Free: 866-505-7173
Prism Business Media
9800 Metcalf Avenue
Overland Park, KS 66212
Copyright 2006, Prism Business Media. 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 Prism Business Media.