| CONTENTS
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90.3
Code Arrangement
What's Wrong
Here?
Code Q&A
Code Quiz
NEMA Active on the
2008 Code Revision Front
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About this Newsletter
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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.
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Top 50 NEC Rules
90.3
Code Arrangement
By Mike Holt
The NEC consists of an introduction and nine chapters.
The requirements noted in Chapters 1 through 4 apply to all
installations. The requirements in Chapters 5, 6, and 7 apply to
special
occupancies, special equipment, or other special conditions and can
supplement or modify the requirements found in Chapters 1 through 4.
For example, the general requirements in 250.118 state that a metal
raceway, such as EMT, is suitable to provide a low-impedance path to
the
power supply for ground fault current. However, 517.13(B) of Art. 517
(Health Care Facilities) doesn't consider the raceway to be sufficient.
It requires you to install an insulated copper conductor in the raceway
for this purpose.
Chapter 8 contains the requirements for communications systems such
as telephone, antenna wiring, CATV, and network-powered broadband
systems. Communications systems aren't subject to the general
requirements of Chapters 1 through 4, or the special requirements of
Chapters 5, 6, and 7 -- unless there's a specific reference noted in
Chapter 8 to these earlier chapters.
Chapter 9 contains the tables necessary to calculate raceway sizing,
conductor fill, and voltage drop. Annexes aren't part of the Code, but
are included for informational purposes.
Editor's note: This information was extracted from Mike
Holt's
textbook, Understanding
the National Electrical Code.
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Code Challenge
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: Separation anxiety
Code Q&A
By Mike Holt
Q. Can an air duct be installed directly above
an
electrical panel?
Visit EC&M's
Web site to see the answer.
Code Quiz
By Steven Owen
Q. Excluding exceptions, what is the requirement
for cabling work space, which includes a requirement for a clear work
space not less than __________ wide where cables are located on both
sides? In the case of cables installed on one side only, the minimum
clear workspace shall not be less than 750 millimeters (2 feet 6
inches)
wide. The vertical headroom shall not be less than __________, unless
the opening is within 300 millimeters (1 foot), measured horizontally,
of the adjacent interior wall of the enclosure.
A) 3 feet 6 inches / 6 feet
B) the width of the equipment / 6 feet 6 inches or the height
of the equipment
C) 8 feet or the width of the equipment / 6 feet 7 inches or
the height of the equipment
D) 900 millimeters (3 feet) / 1.8 meters (6 feet)
Visit EC&M's
Web site for the answer and explanation.
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Code News Update
NEMA Active on the 2008
Code
Revision Front
According to the April 2006 issue of
Electroindustry, 40 of the 56 2008 Code change proposals
submitted by NEMA have been accepted. Many of the revisions are focused
on personnel safety devices and fire protection devices. According to
the write-up, accepted revisions include:
- A new requirement for 120V receptacle outlets at all dwelling
balcony, deck, and porch areas. The outlets would have to be GFCI
protected.
- An expansion of AFCI protection in dwellings to include all 120V,
15A, and 20A branch circuits.
- An extension of GFCI protection to cover all outdoor non-dwelling
120V, 15A, and 20A outlets and all 120V outlets located within 6 feet
of
a sink.
- A new Article 626 for Electrified Parking Space Equipment.
- Revision of Article 382 to include a new "concealable nonmetallic
extension" wiring method.
- The acceptance of rigid nonmetallic raceway wiring methods in
hazardous, classified locations.
- Relocation of Table 430.91 to Article 110, which would provide a
Code-wide selection criteria for enclosure types.
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