| CONTENTS
|
Class 1, Class 2, and Class 3
Remote-Control, Signaling, and Power-Limited Circuits
725.61
Applications of Class 2 and Class 3 Cables
Miss
Authorization
What's
Wrong
Here?
Code Q&A
Code Quiz
Grounding vs Bonding Seminar
|
|
About this Newsletter
|
This twice-a-month
e-newsletter is brought to you from the
publisher of EC&M magazine. CodeWatch will:
Let you know what could be changing in the Code®.
Help you brush up on your ability to apply the Code®.
Test your knowledge of the Code® with a Q&A format.
Introduce you to the people who vote on the rule changes.
Provide information on upcoming Code® seminars and shows.
Give you an opportunity to sound off on Code®-related issues.
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.
|
Subscriptions
|
|
To sign up
for your free subscription, click here: Subscribe
To unsubscribe from this newsletter click here: Unsubscribe
To get this newsletter in a different format (Text, AOL or HTML),
or to change your e-mail address, please visit your profile page to change your delivery
preferences.
|
Back Issues
|
|
Missed an
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!
|
Advertising
|
To find out
how to advertise in this newsletter, e-mail David Miller or call
him
at (312) 840-8497.
The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered trademark of the
National Fire Protection Association.
ADVERTISEMENT
|
| | | | |
|
Top 2005 Code Changes
Class 1, Class 2,
and Class 3 Remote-Control, Signaling, and Power-Limited
Circuits
725.61 Applications of Class 2 and Class 3 Cables
By Mike Holt
New sentence identifies the type of nonmetallic raceway
containing Class 2 or Class 3 cables that is permitted in "other spaces
used for environmental air." (Note: Code text has been
paraphrased.)
What the Code says:
Class 2, Class
3, and PLTC cables must comply with the requirements of (A) through
(H).
A) Ducts, Plenums and Other Space Used for Environmental Air. Class 2
or
Class 3 cables cannot be run in ducts or plenums, even if plenum rated
[725.3(B)], but plenum-rated Class 2 or Class 3 cables can be installed
above a suspended ceiling or below a raised floor that is used for
environmental air.
Listed plenum raceways can be installed above a
suspended ceiling or below a raised floor used for environmental air
[300.22(C)], but only if the cables contained in these raceways are
plenum-rated Type CL2P, or CL3P. (Text new to the Code is
underlined.)
Behind the change: Nonplenum-rated Class 2 and Class 3
cables within electrical metallic tubing, as permitted by 300.22(C),
can
be installed above a suspended ceiling or below a raised floor that is
used for environmental air.
ADVERTISEMENT
Achieve your performance goals
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
Nightmare Installations
Miss Authorization
When called to install a dedicated circuit for a new
bathroom spa/tub, I gave a fair bid and was awarded the job by the lady
who owned the home. As I neared completion, a gentleman who had
accompanied the woman earlier in the day asked me to also do a "few
other items" concerning the bath's lighting circuits and outlets. I
found these requests within the broad scope of the job and completed
them as asked. When the lady returned at the completion of the job she
refused to pay for the "extra" work, stating the gentleman was merely a
friend and had no authority to authorize any work at all. Since I had
no
contract and no verbal agreement with the owner, I had no recourse to
recover my lost services. This was a lesson learned at some cost.
Mike Huwe
Manhattan Beach, Calif.
Send your 200-word story to us and it may
appear in a future issue of CodeWatch. Authors of stories chosen will
receive $25.
ADVERTISEMENT
 Cool Electronic Cabinets
Stop electronic control downtime due to 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 literature.
www.exair.com/15/540_11a.htm
Code Challenge
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: Which one of these covers meets the
Code?
Code Q&A
By Mike Holt
Q. A fellow electrician told me if I were to
wire
an aboveground storable pool pump motor for 240V operation, the
receptacle outlet would need to be located 10 feet from the pool. I
thought five feet was the minimum. Who's right?
Visit EC&M's
Web site to see the answer.
Code Quiz
By Steven Owen
Q. What is the minimum cable tray width required
for an installation that consists of six sets of 1,000 kcmil conductors
(rated 600V) bundled in six sets of three-each conductors in an
uncovered ladder type tray? The bundles are configured in the form of a
triangle -- two side-by-side on the bottom with the third sitting on
top
of the two. The cable tray is not listed for grounding and will not be
used as the equipment grounding conductor. As such, there are a total
of
19 conductors in the tray. The outer diameter of all 19 conductors is
1.44 inches. Do you know the proper name of this 19th conductor?
A) 17.28 inches minimum / equipment bonding conductor
B) 18.72 inches minimum / equipment grounding conductor
C) 25.92 inches minimum / grounded conductor
D) 27.36 inches minimum / grounding electrode conductor
Visit EC&M's
Web site for the answer and explanation.
ADVERTISEMENT
 Free Customizable Arc Flash Specification
ESA, developers of EasyPower power system analysis software, has
designed a complimentary Arc Flash Study Performance Specification to
assist with arc flash hazard initiatives. Provided in a format which
allows for easy modification, this specification will cut weeks off of
development time. It is available for download from ESA's website, in
addition to other Arc Flash Hazard Resources.
www.easypower.com
Offer code: WA0517
Shows and Events
Grounding vs
Bonding Seminar
Time is running out! You only have two more chances
this
year to attend one of Mike Holt's grounding versus bonding seminars.
Grounding and bonding of electrical systems, sensitive electronic, and
communications equipment is the most important and least understood
activity in the electrical, data processing, and communications
industry. At this two-day seminar, Code expert Mike Holt will explain
the basics as well as the advance concepts necessary to understand the
practical grounding and bonding rules in the NEC for systems not over
600V.
Download
the conference brochure for specific dates and locations.
ADVERTISEMENT
www.NECcode.com
The National Electrical Code Internet Connection, the No. 1
rated Code Web site in the world, offers the following FREE products:
Books, Code Quiz, DVDs, Graphics for PowerPoint, Newsletter, Online
Training, Posters, Simulated Exams, Software, Video clips, and Videos
Visit www.NECcode.com and stay
current with important industry issues.
|
|
You are subscribed to this newsletter as <*email*>
For questions concerning delivery of this
newsletter, please contact our Customer Service Department at:
US Toll Free: (866) 505-7173
International: (402) 505-7173
or custserv@newsletter.primediabusiness.com
Primedia Business Magazines & Media
9800 Metcalf Avenue
Overland Park, KS 66212
Copyright 2005, PRIMEDIA. All rights reserved. This article is
protected
by United States copyright and other intellectual property laws and may
not be reproduced, rewritten, distributed, re-disseminated,
transmitted,
displayed, published or broadcast, directly or indirectly, in any
medium
without the prior written permission of Primedia Business Magazines &
Media Inc.
|
|
