Securing and Supporting
Committee Solicits Proposals
Harmonics in Commercial Environments
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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
Securing and Supporting
By Mike Holt
Secured in Place
Raceways, cable assemblies, boxes, cabinets, and fittings must be
securely fastened in place. The ceiling-support wires or ceiling grid
cannot be used to support raceways and cables (power, signaling, or
communications). However, independent support wires, secured at both
ends, that provide secure support are permitted.
Outlet boxes [314.23(D)] and luminaries can be secured to the
suspended-ceiling grid if securely fastened to the ceiling-framing
member by mechanical means such as bolts, screws, or rivets, or by the
use of clips or other securing means identified for use with the type
ceiling framing member(s) [410.16(C)].
Electrical wiring within the cavity of a fire-rated floor-ceiling or
roof-ceiling assembly can be supported by independent support wires
are attached to the ceiling assembly. The independent support wires
be distinguishable from the suspended ceiling-support wires by color,
tagging, or other effective means.
Electrical wiring located within the cavity of a nonfire-rated
floor-ceiling or roof-ceiling assembly, can be supported by independent
support wires that are secured at both ends. Support wires within
nonfire-rated assemblies aren't required to be distinguishable from the
suspended-ceiling framing support wires.
Raceways Used for Support
Raceways can only be used as a means of support for other raceways,
cables, or nonelectrical equipment under the following conditions:
- Class 2 and Class 3 circuits. Class 2 and Class 3 cables can
be supported by the raceway that supplies power to the equipment
controlled by the Class 2 or Class 3 circuit. Where a Class 2 or Class
circuit is reclassified as a Class 1 circuit [725.52(A) Ex. 2], it can
be run with the associated power conductors in accordance with
- Boxes supported by conduits. Raceways are permitted as a
means of support for threaded boxes and conduit bodies in accordance
with 314.23(E) and (F).
- Cables not used as a means of support. Cables cannot be used
to support other cables, raceways, or non-electrical
Editor's note: This information was extracted from Mike
the National Electrical Code
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: A misdirected installation
By Mike Holt
Q. Can the disconnect switch be located next to
equipment installed above an accessible drop ceiling, or must the
be installed at a readily accessible location?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. Disregarding exceptions, which enclosure is
limited to 30-foot (maximum) extensions beyond the equipment it
- Metallic wireways, only where limited to a maximum of 30
- Nonmetallic wireways, only where limited to a maximum 20% fill for
- Busways, as long as the busway is not supplying and supporting
flexible cords and cables.
- Auxiliary gutters.
Web site for the answer and explanation.
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. Register now for the
EasyPower training coming to Indianapolis, Indiana September 17-21,
2007! One-touch automated design and one-touch automated protective
device coordination options, will also be introduced!
Code News Update
Technical Committee Solicits
The technical committee for NFPA 110-2005, Standard for
Emergency and Standby Power Systems, is now accepting proposals for
recommendations on content additions, changes, and/or deletions. This
standard covers performance requirements for power systems providing an
alternate source of electrical power to loads in buildings and
facilities in the event that the primary power source fails. Proposal
forms are available in the back of the standard or the NFPA Directory,
or you can download a copy from the NFPA Directory online.
The proposal closing date is listed on the NFPA Web site as November
Cool Electronic Cabinets
Beat the heat and prevent hot weather failures. UL Listed Cabinet
Coolers from EXAIR produce 20 degree Fahrenheit air from an ordinary
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.
Shows and Events
Mitigating Harmonics in Commercial
This free live conference will be presented by John
DeDad, EC&M magazine, on August 16th at 10 a.m. Eastern and
Pacific times, in the EC&M e-Tradeshow. To gain access to the
event, go to www.ecmweb.com/etradeshow,
sign in or register as an attendee, and follow the signs to the
presentation room. And be sure to take a look at the On-Demand Theater,
where you can view past online conferences 24 hours a day, 7 days a
week, and 365 days a year.
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. Seven Code change conferences have been scheduled 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.
For additional information on the dates and locations of these
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