Spread of Fire or Products of Combustion
Better Late Than
Never: Take 2
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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
Spread of Fire or Products of Combustion
By Mike Holt
Electrical circuits and equipment must be installed in
such a way that the spread of fire or products of combustion will not
substantially increased. Openings in fire-rated walls, floors, and
ceilings for electrical equipment must be firestopped using methods
approved by the authority having jurisdiction to maintain the
fire-resistance rating of the fire-rated assembly. Firestop material is
listed for the specific types of wiring methods and construction
A Fine Print Note for this section of the Code notes that
of electrical construction materials published by qualified testing
laboratories contain listing and installation restrictions necessary to
maintain the fire-resistive rating of assemblies. Outlet boxes must
a horizontal separation not less than 24 inches when installed in a
fire-rated assembly, unless an outlet box is listed for closer spacing
or protected by fire-resistant "putty pads" in accordance with
This rule applies to control, signal, and communications cables.
- CATV [820.3(A)]
- Communications [800.3(C)]
- Control and Signaling [725.3(B)]
- Fire Alarm [760.3(A)]
- Optical Fiber Cables [770.3(A)]
- Sound Systems [640.3(A)]
Editor's note: This information was extracted from Mike
the National Electrical Code
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What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
Web site to see the answer.
Hint: Sand is glass now.
By Mike Holt
Q. I want to install fluorescent strip lights on
a sheetrock ceiling. Can I support the fixtures directly over the
recessed outlet box and connect to the branch-circuit wiring through a
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. According to the 2005 NEC (not any specific
state or local code), when installing 2-foot by 4-foot fluorescent
lay-in luminaires in suspended ceilings, how many corners of any one of
the luminaires require an independent support wire to support it?
- All four corners.
- On any two opposite corners.
- On any two corners. The support does have to be on opposite
- There is no requirement for independent support wires for this
application as written.
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 Orlando, Florida November 5 - 9, 2007!
One-touch automated design and one-touch automated protective device
coordination options, will also be introduced!
Code News Update
Better Late Than Never: Take
Although the release date for the 2008 NEC is right
around the corner, some states are just now getting around to adopting
the 2005 NEC. According to the August 2007 issue of NEMA's
electroindustry, the city of Tucson, Ariz., adopted the 2005 NEC
and 2006 editions of the International Building Code, International
Residential Code, International Energy Conservation Code, and
International Fuel Gas Code on June 12, 2007. Although there was a
30-day grace period under which the old codes could still be used, the
new codes were to take effect immediately.
According to the article in electroindustry, the 2005 NEC was
adopted with several modifications, including:
here to view a pdf file of the City of Tucson's amendments to the
- A requirement for the color-coding of conductors,
- Revisions to the requirements for disconnecting means at some
separate buildings or structures,
- The number of service entrance conductor sets allowed for
- Allowable types of equipment grounding conductors,
- Elimination of the requirements for LCDI or AFCI protection for air
conditioner units in Art. 440, and
- The deletion of selective coordination for emergency and legally
required standby systems.
Cool Electronic Cabinets
Prevent hot weather failures that can affect production. 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.
Shows and Events
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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