Class 1, Class 2, and Class 3
Remote-Control, Signaling, and Power-Limited Circuits
Applications of Class 2 and Class 3 Cables
Grounding vs Bonding Seminar
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Top 2005 Code Changes
Class 1, Class 2,
and Class 3 Remote-Control, Signaling, and Power-Limited
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
What the Code says:
Class 2, Class
3, and PLTC cables must comply with the requirements of (A) through
A) Ducts, Plenums and Other Space Used for Environmental Air. Class 2
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
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
Behind the change: Nonplenum-rated Class 2 and Class 3
cables within electrical metallic tubing, as permitted by 300.22(C),
be installed above a suspended ceiling or below a raised floor that is
used for environmental air.
Achieve your performance goals
Anticipate, prevent and troubleshoot motors, electrical and equipment
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with Fluke infrared thermometers. www.fluke.com/codewatch_temp
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
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.
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
Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. UL
Listed Cabinet Coolers produce 20 degree Fahrenheit air from an
supply of compressed air to cool electrical controls. Thermostat
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.
What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the NEC?
Web site to see the answer.
Hint: Which one of these covers meets the
By Mike Holt
Q. A fellow electrician told me if I were to
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?
Web site to see the answer.
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
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
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
Web site for the answer and explanation.
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.
Offer code: WA0517
Shows and Events
Time is running out! You only have two more chances
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
the conference brochure for specific dates and locations.
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
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