Wiring to be Accessible
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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.
Top 50 NEC Rules
Wiring to be Accessible
By Mike Holt
Boxes, conduit bodies, and handhole enclosures must be
installed so that the wiring is accessible without removing any part of
the building, sidewalks, paving, or earth.
Exception: Listed boxes and handhole enclosures can be buried if
covered by gravel, light aggregate, or non-cohesive granulated soil,
their location is effectively identified and accessible for
Editor's note: This information was extracted from Mike
the National Electrical Code
Escape winter weather: Register for the
EasyPower training coming to Scottsdale, Arizona January 21 - 25,
2008! Streamline the implementation of your Arc Flash and
Safety Program. What used to take hours, now takes mere seconds!
EasyPower delivers Windows(R) -based tools for designing, analyzing,
monitoring electrical power systems. 2-Day Automated Design class
will also be held January 28 - 29, 2008
What's Wrong Here?
Think you know how this installation violates the
NEC? Visit EC&M's
Web site to see the answer.
Hint: New water feature.
By Mike Holt
Q. A single main breaker is installed, then taps
supply individual meters with disconnecting means for individual
tenants. Should a main bonding jumper be installed at the single main
breaker or at each separate disconnect?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. What is the maximum allowable ampacity of a
AWG THHN or THWN-2 insulated conductor installed in a schedule 80 PVC
raceway (90°C rated) installed underground from the branch-circuit
panelboard to the luminaires installed for parking lot lighting? There
are four current-carrying conductors in this raceway. Disregard the
terminals and the branch-circuit rating for this example.
Web site for the answer and explanation.
Cool Electronic Cabinets
EXAIR's low cost Cabinet Coolers stop electronic control downtime due
heat, dirt and moisture. UL Listed Cabinet Coolers produce 20 degree
Fahrenheit air from an ordinary supply of compressed air to cool
electrical controls. Thermostat control minimizes air usage. Maintains
the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web
site offers detailed information, downloadable drawings and PDF
Shows and Events
EC&M Code Change
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
of our 2008 Code change conferences will receive Professional
Development Hours (PDHs), a requirement for re-licensing in many
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
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