| CONTENTS
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90.4
Enforcement
What's Wrong
Here?
Code Q&A
Code Quiz
NEC Sessions
Scheduled for 2006 NFPA World Safety Conference & Exposition
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Top 50 NEC Rules
90.4
Enforcement
By Mike Holt
The Code is set up for enforcement by governmental
bodies that exercise legal jurisdiction over electrical installations
for power, lighting, signaling circuits, and communications systems.
Enforcement of the NEC is the responsibility of the authority having
jurisdiction (AHJ), which is responsible for interpreting requirements,
approving equipment and materials, waiving Code requirements, and
ensuring the equipment is installed in accordance with listing
instructions.
Although the AHJ is responsible for interpreting the NEC, his or her
decisions must be based on a specific Code requirement. If they reject
an installation, they're legally responsible for informing the
installer
which specific NEC rule was violated.
Only the AHJ has authority to approve the installation of equipment
and materials. Typically, the AHJ will approve equipment listed by a
product testing organization such as Underwriters Laboratories, Inc.
(UL). However, the NEC doesn't require all equipment to be listed. This
means that he or she can reject an installation of listed equipment and
can approve the use of unlisted equipment. But given our highly
litigious society, approval of unlisted equipment is becoming
increasingly difficult to obtain.
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: Is something missing here?
Code Q&A
By Mike Holt
Q. Can the service disconnect be located within
5
feet of a pool or hot tub?
Visit EC&M's
Web site to see the answer.
Code Quiz
By Steven Owen
Q. According to 110.16, certain information is
required on the label when marking switchboards, panelboards,
industrial
control panels, meter socket enclosures, and motor control centers. To
be compliant with this section of the Code, which of the following
examples best illustrates the written text of 110.16? The arc flash
analysis determined that the incident energy at an industrial control
panel is 6 cal/cm2. The industrial control panel will
require
troubleshooting, as well as testing for voltage by qualified
persons.
Answer:
A) Beware. Shock boundary 36 in.
B) Hot. Energized. Energized work permit required. Job briefing
not required for testing and troubleshooting.
C) Warning. Arc flash and shock hazard. Appropriate PPE
required.
D) Warning. Job briefing required before starting work. Limited
approach boundary.
Visit EC&M's
Web site for the answer and explanation.
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Shows and Events
NEC Sessions Scheduled for 2006
NFPA
World Safety Conference & Exposition
The 12 sessions that make up the
necforum™ are
designed
to help you consider new electrical design issues, analyze maintenance
programs, review best practices in the electrical contracting arena,
learn effective inspection techniques, and implement practical safety
programs. If these topics interest you, then make plans to fly to
Orlando in early June and take part in this year's event, which will be
held from June 2-8, 2006. Visit the NFPA
World Safety Web site for additional details.
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to request a free sample.
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