| CONTENTS
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Pending Code Change
Item for 2011 NEC
What's Wrong
Here?
Code Q&A
Code Quiz
Calling All Code
Writers
Electric West
2010
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Change Proposals
Pending Code Change Item for 2011
NEC
As noted in the NEC Committee Report on
Proposals, 2010 Annual Revision Cycle, Code-Making Panel 17 has
voted to accept a Code change submitted by Ted "Smitty" Smith,
Electrical Experts Consulting (Log #3845 NEC-P02). The recommendation
calls for revising a portion of the text in Table 220.102 as follows:
"Loads expected to operate simultaneously, but not less than 125
percent full-load current of the largest motor and not less than the
first 60 amperes of load.The greater of the following: All loads
that are expected to operate simultaneously, 125 percent of the full
load current of the largest motor, or the first 60 amperes of the
load."
The remaining text and numbers in the Table will remain as is.
As noted in the substantiation summary, this new wording does not
change the intent of the requirement, but hopefully makes things a
little more clear for end-users. Smitty is an apprentice instructor who
teaches journeyman continuing education courses in Colorado. He says
the
existing wording of this rule causes confusion for his students.
You can download
an electronic version of the report via the NFPA Web site.
Although the comment period is now closed, the results of the
committee action on all submitted comments will be published in the
NEC Committee Report on Comments, which will be made available
to
all who request it. The Report on Comments mail date is
scheduled
for March 29, 2010.
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Code Challenge
What's Wrong Here?
By Brian J. McPartland
Think you know how this installation violates the
NEC? Visit EC&M's
Web site to see the answer.
Hint: Box support
Code Q&A
By Mike Holt
Q. Are AFCIs required for light fixtures and
smoke alarms?
Visit EC&M's Web
site to see the answer.
Code Quiz
By Steven Owen
Fill in the blank
When working with electrical systems, including multi-conductor cables,
identification of conductors is an important issue. For example, on a
new 480/277V, 3-phase, 4-wire system, the NEC requires you to identify
conductors by phase or line and system [210.5(C)]. It is common
practice
to identify these ungrounded conductors with an outer finish (i.e.,
insulation color) that is: brown, orange, and yellow; gray for the
grounded conductor; and green, green with one or more yellow stripes,
or
bare for the equipment grounding conductor. But when working on
existing
electrical systems, such as 480/277V, 3-phase, 4-wire systems, you
should take care because the color __________ may have been used for an
ungrounded conductor. Hint: See the Fine Print Note.
- white
- white with one or more colored stripes, other than green
- black with three distinctive white stripes on its entire length
- gray
Visit EC&M's
Web site for the answer and explanation.
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Code News Update
Calling All Code Writers
Don't miss an opportunity to help create the next
edition of NFPA 70E, Standard for Electrical Safety in the Workplace.
Time is running out! You have between now and Jan. 5, 2010 to submit
your proposals for new requirements, revisions to existing
requirements,
or deletion of existing requirements. But don't just fly by the seat of
your pants and submit a poorly worded submission without any technical
justification. It's important that you draft your proposal in a clear
and simple manner and back it up with technical justification. You must
convince the Code committee members that your change makes sense for
all
parties involved.
You can download
a proposal form directly from the NFPA Web site.
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Shows and Events
Electric West
2010
The Electric West Show, to be held March 16-18, 2009 at
the Las Vegas Convention Center, is the perfect place to brush up on
the
latest NEC topics — and earn continuing education credits in the
process. Geared toward electrical contractors, consulting & specifying
engineers, electricians, and plant facility personnel, the conference
program will offer the following NEC seminars, presented by industry
experts such as Mike Holt, Keith Lofland, and Edward Gorginian.
- Analysis of 2011 NEC Changes
- Understanding Important NEC Requirements
- Dwelling Calculations
- Advanced NEC Calculations
- Grounding vs. Bonding
- Swimming Pools and Similar Installations
For more information, visit our Web
site, or click here
to register.
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to use the White Book FREE online or to order a copy.
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