| CONTENTS
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300.5 Underground
Installations Correction
300.10
Electrical Continuity
What's
Wrong
Here?
Code Q&A
Code Quiz
Let's Go Racing! Win a Free Road
America Race Weekend for Two
EC&M Code Change
Conferences
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Editorial Correction
300.5 Underground Installations
Correction
In the previous issue of CodeWatch, Mike Holt's Top 50
NEC Rules item focused on the topic of underground installations. Item
(1) focused on the protection of direct buried conductors and cables
emerging from grade. The second sentence in this paragraph read as
follows: "Protection isn't required to extend more than 18 inches below
grade, and protection above grade must extend to a height not less than
18 feet." As many of you most likely noted, the "18 feet" reference is
incorrect. The correct minimum height is "8 feet." The editors would
like to apologize to the author and the subscribers for this error.
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Top 50 NEC Rules
300.10
Electrical Continuity
By Mike Holt
All metal raceways, cable, boxes, fittings, cabinets,
and enclosures for conductors must be metallically joined together
(bonded) to form a continuous low-impedance fault-current path that is
capable of carrying any fault current likely to be imposed on it
[110.10, 250.4(A)(3), and 250.122]. Metal raceways and cable assemblies
must be mechanically secured to boxes, fittings, cabinets, and other
enclosures.
Exception 1: Short lengths of metal raceways used for the
support or protection of cables aren't required to be electrically
continuous, nor are they required to be bonded to an effective
ground-fault current path [250.86 Ex. 2 and 300.12 Ex.].
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: I stayed at a Holiday Inn last night!
Code Q&A
By Mike Holt
Q. In a dwelling unit, what are the receptacle
requirements for island counter tops?
Visit EC&M's Web
site to see the answer.
Code Quiz
By Steven Owen
Q. When installing metal-armored cables and
metal
raceways, is it permissible to connect a metal-armored cable or a metal
raceway to a nonmetallic box?
- Yes, as long as the armored cable is BX cable or equivalent. There
is an internal equipment grounding conductor, however, there is no
internal bonding means available to bond the armored cables together.
- Yes, as long as the raceway is flexible metal conduit or liquidtite
flexible metal conduit installed in a length not to exceed 6 feet.
There
is no internal equipment grounding conductor or and no bonding means
available to bond the cables together.
- Yes. Where internal bonding means are provided between all entries,
nonmetallic boxes shall be permitted to be used with metal raceways or
metal-armored cables.
- No way! This is not going to happen according to the rules of the
NEC.
Visit EC&M's
Web site for the answer and explanation.
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Shows and Events
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EC&M
Code
Change Conferences
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
any
of our 2008 Code change conferences will receive Professional
Development Hours (PDHs), a requirement for re-licensing in many
states.
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
events, click
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