NEC Report on
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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
By Mike Holt
Bonding jumpers must be of copper. Bonding jumpers must
terminate by exothermic welding, listed pressure connectors, listed
clamps, or other listed means. Sheet-metal screws cannot be used for
termination of bonding conductors or connection devices [250.8].
Bonding jumpers for service raceways must be sized in accordance
Table 250.66, based on the ungrounded service conductors within the
service raceway. Where service conductors are paralleled in two or more
raceways or cables, the bonding jumper for each raceway or cable must
sized on the ungrounded service conductors in each raceway or cable.
Bonding jumpers on the load side of service equipment must be sized
in accordance with Table 250.122, based on the rating of the
circuit-protection device. A single bonding jumper sized in accordance
with 250.122 can be used to bond multiple raceways or cables.
Where the equipment bonding jumper is installed outside of a
its length must not exceed 6 feet -- and it must be routed with the
raceway. Exception: An equipment bonding jumper of any length
be used to bond isolated sections of metal raceways at outside pole
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 potentially shocking installation
By Mike Holt
Q. Can a circuit breaker be used to switch
Web site to see the answer.
By Steven Owen
Q. Where a transient voltage surge suppressor
(TVSS) is installed, the TVSS shall comply with which of the
- The rating of the TVSS shall be equal to or greater than the
continuous phase-to-ground power frequency voltage available at the
point of application.
- TVSS shall be a listed device.
- TVSS shall be marked with short circuit current rating and shall
be installed at a point on the system where the available fault current
is in excess of that rating.
- TVSS shall not be installed on ungrounded systems, impedance
grounded systems, or corner grounded delta systems unless listed
specifically for use on these systems.
- All of the above.
Web site for the answer and explanation.
One-touch automated design and one-touch automated protective device
coordination options, available in EasyPower 8.0, will be introduced in
the Hands-On training in Portland, OR April 30 -- May 4, 2007!
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.
Code News Update
NEC Report on Comments Now
The 2007 NEC Report on Comments is now available
for all to view. Download the file from the NFPA
See something in the report you're not too happy with? You can
file an amending motion on the technical committee report by submitting
a Notice of Intent to Make a Motion by the deadline of May 4, 2007.
Certified motions that receive notice of proper Amending Motions will
presented for action at the annual meeting to be held June 3-7, 2007 in
Cool Electronic Cabinets
EXAIR's low cost Cabinet Coolers stop electronic control downtime due
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
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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