| CONTENTS
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250.10294
Bonding Jumper
What's Wrong
Here?
Code Q&A
Code Quiz
NEC Report on
Comments Now Available
EC&M Code
Change Conferences
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Top 50 NEC Rules
250.10294
Bonding Jumper
By Mike Holt
Bonding jumpers must be of copper. Bonding jumpers must
terminate by exothermic welding, listed pressure connectors, listed
clamps, or other listed means. Sheet-metal screws cannot be used for
termination of bonding conductors or connection devices [250.8].
Bonding jumpers for service raceways must be sized in accordance
with
Table 250.66, based on the ungrounded service conductors within the
service raceway. Where service conductors are paralleled in two or more
raceways or cables, the bonding jumper for each raceway or cable must
be
sized on the ungrounded service conductors in each raceway or cable.
Bonding jumpers on the load side of service equipment must be sized
in accordance with Table 250.122, based on the rating of the
circuit-protection device. A single bonding jumper sized in accordance
with 250.122 can be used to bond multiple raceways or cables.
Where the equipment bonding jumper is installed outside of a
raceway,
its length must not exceed 6 feet -- and it must be routed with the
raceway. Exception: An equipment bonding jumper of any length
can
be used to bond isolated sections of metal raceways at outside pole
locations.
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: A potentially shocking installation
Code Q&A
By Mike Holt
Q. Can a circuit breaker be used to switch
fluorescent lighting?
Visit EC&M's
Web site to see the answer.
Code Quiz
By Steven Owen
Q. Where a transient voltage surge suppressor
(TVSS) is installed, the TVSS shall comply with which of the
following?
- The rating of the TVSS shall be equal to or greater than the
maximum
continuous phase-to-ground power frequency voltage available at the
point of application.
- TVSS shall be a listed device.
- TVSS shall be marked with short circuit current rating and shall
not
be installed at a point on the system where the available fault current
is in excess of that rating.
- TVSS shall not be installed on ungrounded systems, impedance
grounded systems, or corner grounded delta systems unless listed
specifically for use on these systems.
- All of the above.
Visit EC&M's
Web site for the answer and explanation.
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Code News Update
NEC Report on Comments Now
Available
The 2007 NEC Report on Comments is now available
for all to view. Download the file from the NFPA
Web site.
See something in the report you're not too happy with? You can
always
file an amending motion on the technical committee report by submitting
a Notice of Intent to Make a Motion by the deadline of May 4, 2007.
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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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