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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
(A) General Requirements
The ampacity of a conductor can be determined either by using the
in accordance with 310.15(b), or under engineering supervision as
provided in 310.15(C).
FPN No. 1: Ampacities provided by this section do note take
voltage drop into consideration. See 210.19(A) FPN No. 4 for branch
circuits and 215.2(D) FPN No. 2 for feeders.
If a single length of conductor is routed in a manner that two or
more ampacity ratings apply to a single conductor length, the lower
ampacity must be used for the entire circuit. See 310.15(B).
Exception: When different ampacities apply to a length of
conductor, the higher ampacity is permitted for the entire circuit if
the reduced ampacity length does not exceed 10 ft and its length
exceed 10% of the length of the higher ampacity.
to read the rest of this article.
No matter where you are in the challenging process of developing or
implementing an Arc Flash Safety Program, you can rely on ESA to help.
Take advantage of the free resources we offer such as our Arc Flash
Book, Arc Flash Specification, 10 Steps of an Effective Arc Flash
Safety Program guide and more. www.easypower.com/support.php
By Joe Tedesco
Think you know how this installation violates the
Web site to see the answer.
Hint: Fill it with ice.
By Mike Holt
Q. How far away from a diesel fuel-dispensing
tank must the nonexplosion-proof equipment be located?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. A new service consisting of six individual
disconnect switches has been installed outdoors, on the back side of a
small retail shopping center. One of the disconnect switches has been
installed remote from the others. The disconnect installed remote from
the others is for the water pump intended for fire protection. Is this
installation NEC compliant?
- Yes, because the disconnect switches can be installed in any
location and in any grouping of the installers choice -- no NEC
- Yes, because one of the two to six service disconnecting means is
permitted to be installed remote from the others that are grouped
together in one location if it meets the requirements of the exception
associated with the grouping requirement.
- No, because retail shopping locations require that all service
disconnects be installed in a locked room in a separate building
adjacent to the shopping area.
- No, because all service disconnects need to be installed in indoor
Web site for the answer and explanation.
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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