NEMA Active on the
2008 Code Revision Front
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
The NEC consists of an introduction and nine chapters.
The requirements noted in Chapters 1 through 4 apply to all
installations. The requirements in Chapters 5, 6, and 7 apply to
occupancies, special equipment, or other special conditions and can
supplement or modify the requirements found in Chapters 1 through 4.
For example, the general requirements in 250.118 state that a metal
raceway, such as EMT, is suitable to provide a low-impedance path to
power supply for ground fault current. However, 517.13(B) of Art. 517
(Health Care Facilities) doesn't consider the raceway to be sufficient.
It requires you to install an insulated copper conductor in the raceway
for this purpose.
Chapter 8 contains the requirements for communications systems such
as telephone, antenna wiring, CATV, and network-powered broadband
systems. Communications systems aren't subject to the general
requirements of Chapters 1 through 4, or the special requirements of
Chapters 5, 6, and 7 -- unless there's a specific reference noted in
Chapter 8 to these earlier chapters.
Chapter 9 contains the tables necessary to calculate raceway sizing,
conductor fill, and voltage drop. Annexes aren't part of the Code, but
are included for informational purposes.
Editor's note: This information was extracted from Mike
the National Electrical Code.
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
What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the NEC?
Web site to see the answer.
Hint: Separation anxiety
By Mike Holt
Q. Can an air duct be installed directly above
Web site to see the answer.
By Steven Owen
Q. Excluding exceptions, what is the requirement
for cabling work space, which includes a requirement for a clear work
space not less than __________ wide where cables are located on both
sides? In the case of cables installed on one side only, the minimum
clear workspace shall not be less than 750 millimeters (2 feet 6
wide. The vertical headroom shall not be less than __________, unless
the opening is within 300 millimeters (1 foot), measured horizontally,
of the adjacent interior wall of the enclosure.
A) 3 feet 6 inches / 6 feet
B) the width of the equipment / 6 feet 6 inches or the height
of the equipment
C) 8 feet or the width of the equipment / 6 feet 7 inches or
the height of the equipment
D) 900 millimeters (3 feet) / 1.8 meters (6 feet)
Web site for the answer and explanation.
Arc Flash Hazard Resource Center
Prevent Arc Flash Hazards in your facility! Find valuable information
help you understand and recognize the dangers of arc flash hazards.
ESA's Arc Flash Hazard Resource Center will provide you with
on OSHA Standard 29, IEEE-1584, and NFPA 70E. Download
helpful tools to get you started.
Offer code: WA0517
Code News Update
NEMA Active on the 2008
According to the April 2006 issue of
Electroindustry, 40 of the 56 2008 Code change proposals
submitted by NEMA have been accepted. Many of the revisions are focused
on personnel safety devices and fire protection devices. According to
the write-up, accepted revisions include:
- A new requirement for 120V receptacle outlets at all dwelling
balcony, deck, and porch areas. The outlets would have to be GFCI
- An expansion of AFCI protection in dwellings to include all 120V,
15A, and 20A branch circuits.
- An extension of GFCI protection to cover all outdoor non-dwelling
120V, 15A, and 20A outlets and all 120V outlets located within 6 feet
- A new Article 626 for Electrified Parking Space Equipment.
- Revision of Article 382 to include a new "concealable nonmetallic
extension" wiring method.
- The acceptance of rigid nonmetallic raceway wiring methods in
hazardous, classified locations.
- Relocation of Table 430.91 to Article 110, which would provide a
Code-wide selection criteria for enclosure types.
Cool Electronic Cabinets
Summer will be here soon! Prevent hot weather failures. EXAIR's compact
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 NEMA 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
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.