Revises Electrical Rules
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.
Introducing the EC&M
EC&M magazine's new online tradeshow and
conference series is now open! Use it as often as you like at no cost
to you. The E-tradeshow is a 3D exhibition where you can examine some
the latest in electrical products, meet with exhibitors, and gather
information. Plus, you'll be able to attend conference seminars inside
the E-Tradeshow throughout the year.
here and you'll be connected to detailed information about how
to get inside and make full use of the E-tradeshow. In minutes you'll
exploring in the 3D environment, be visiting in our charter exhibitors'
booths, and checking out some very cool products.
See you in the show!
Anticipate, prevent and troubleshoot motors, electrical and equipment
maintenance with fast, accurate non-contact temperature measurements
with Fluke infrared thermometers. www.fluke.com/codewatch_temp
Top 50 NEC Rules
By Mike Holt
Why is grounding so difficult to understand? One reason
is because many do not understand the definition of many important
terms. So let's review a few important definitions contained in
100 and 250.
Bonding . The permanent joining of metal parts together
to form an electrically conductive path that has the capacity to
safely any fault current likely to be imposed on it.
Author's comment: Bonding is accomplished by the use of conductors,
metallic raceways, connectors, couplings, metallic-sheathed cables with
fittings, and other devices recognized for this purpose [250.118].
Bonding jumper . A conductor properly sized in
with Article 250 that ensures electrical conductivity between metal
parts of the electrical installation.
Effective ground-fault current path [250.2]. An intentionally
constructed, permanent, low-impedance conductive path designed to carry
fault current from the point of a ground fault on a wiring system to
electrical supply source. The effective ground-fault current path is
intended to help remove dangerous voltage from a ground fault by
the circuit overcurrent protective device.
Equipment grounding conductor . The low-impedance
fault-current path used to bond metal parts of electrical equipment,
raceways, and enclosures to the effective ground-fault current path at
service equipment or the source of a separately derived system.
Author's comment: The purpose of the equipment grounding (bonding)
conductor is to provide the low-impedance fault-current path to the
electrical supply source to facilitate the operation of circuit
overcurrent protection devices in order to remove dangerous
voltage on conductive parts [250.4(A)(3)]. Fault current returns to the
power supply (source), not the earth! Refer to 250.118 for acceptable
types of equipment grounding conductors.
to read the rest of this article.
ARC FLASH SAFETY EMPHASIS WEEK IN BOSTON,
MA | OCTOBER 2-6, 2006
Discover the theory & practical aspects required to implement an Arc
Flash study & safety training program. Join us for a week of Arc Flash
Hazard concentration including --
online or download a brochure.
- EasyPower® 8.0 Hands-On with ArcFlash
- NFPA 70E Safety Training
- Simulated Arc Flash with IEEE-1584 Testing
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: Is this meter coming or going?
By Mike Holt
Q. Can "line" and "load" conductors be installed
in the same raceway?
Web site to see the answer.
By Steven Owen
Q. When installing a new service for a separate
building constructed on the top floor of a parking garage, it has been
determined that the service conductors will have to be installed in
rigid metal conduit (RMC) starting in the vault below grade of the
floor level of the parking garage. The structural engineer and the
general contractor will not permit the service raceway to be encased
within the concrete of the structure. What are some options available
the electrical contractor to make this installation possible, while
maintaining compliance with the 2005 NEC?
A) Install the RMC (containing service conductors), exposed from
the vault to the first floor and up to the separate building on the top
floor. Protection shall be provided where subject to potential severe
B) Encase the RMC in concrete, not less than 2 inches thick, in
separate chase provided specifically for this conduit.
C) Encase the RMC with brick, not less than 2 inches thick, in a
separate brick chase provided specifically for this conduit.
D) If possible, install the service disconnect (for the separate
building on the top floor) on the first floor in compliance with
From the first floor service disconnect location, install RMC, which
will now contain feeder conductors to the separate building on
the top floor. The conduit and feeder conductors will terminate
in a disconnecting means that is installed per 225.32. This would
the RMC to be exposed.
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
State of Washington
According to the August 2006 issue of
Electroindustry, the State of Washington announced an early
implementation of the 2006 edition of the Washington Electrical Rules.
The story goes on to say, "Citing a relatively few number of revisions
to the previous rules and little action required by legislation, the
Electrical Section of the Department of Labor & Industries was able to
move the schedule forward." The state revises its electrical rules
Connected & Protected
IDEAL's new WeatherProof Wire Connectors are the fastest, easiest
and safest way to connect wires in damp or wet locations. Pre-filled
with a silicone-based sealant and UL listed to 486D, these connectors
protect conductors from moisture, humidity and other corrosive
to request a free sample.
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.