700.9 Wiring for
Emergency Power Systems
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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 2008 Code Changes
700.9 Wiring for Emergency Power
By Mike Holt
The rules on "emergency circuits independent of all
other wiring" when a single generator supplies emergency, legally
required, and/or optional loads were further clarified in the 2008 NEC.
(B) Wiring. To ensure that a fault on the normal wiring
circuits will not affect the performance of emergency wiring or
equipment, all wiring to emergency loads shall be kept entirely
independent of all other wiring, except:
A new subsection (5) was added to clarify that separation of the
served by a generator source for emergency, legally required, and
optional circuits may be accomplished by running feeders from a single
generator to individual overcurrent protective devices or to a
distribution switchboard that separates emergency circuits in different
vertical sections from other loads.
- Wiring in transfer equipment.
- Luminaires supplied from two sources of power.
- Junction box attached to luminaires supplied from two sources of
- Wiring within a common junction box attached to unit equipment,
containing only the branch circuit supplying the unit equipment and the
emergency circuit supplied by the unit equipment.
- Wiring from an emergency source is permitted to supply any
combination of emergency, legally required, or optional loads in
accordance with the following:
(a) From separate vertical switchboard sections or from individual
disconnects mounted in separate enclosures.
(b) By single or multiple feeders without overcurrent protection at the
(c) Legally required and optional standby circuits shall not originate
from the same vertical switchboard section, panelboard enclosure, or
disconnect as emergency circuits.
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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: Fender bender
By Mike Holt
Q. What are the NEC lighting and switching
requirements for stairways?
Visit EC&M's Web
site to see the answer.
By Steven Owen
When installing coaxial cables beyond the point of
grounding, when is it permissible to support coaxial cables by means of
attachment to a conduit or other raceway?
- In a commercial garage (oil change) pit where a camera is
and only experienced technicians work in the pit.
- In any commercial location where public access is restricted, and
only experienced technicians work in these areas.
- Only where it is necessary to support coaxial cables because no
other method of support is readily available.
- Excluding exception(s), it is not permitted per Art. 820
Web site for the answer and explanation.
Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. UL
Listed Cabinet Coolers from EXAIR 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 literature.
click here for more
Shows and Events
The Electric West Show, to be held March 18-20, 2009 at
the Las Vegas Convention Center in conjunction with the Power Quality
Reliability Conference, 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
electricians, and plant facility personnel, there’s something for
everyone at the Electric Show. The biggest electrical marketplace in
western United States, this event attracts 250 exhibiting companies and
more than 6,000 attendees every year. Here's a preview of some of the
NEC seminars planned for next year's event:
For more information, visit our Web
- One- and Two-Family Dwelling Unit Electrical Systems
- Changes to the 2008 NEC
- Swimming Pools and Similar Installations (NEC Article 680)
- Introduction to the 2009 NFPA 70E
Eliminate Red Tags
It takes more than the
UL Mark on a product to satisfy code requirements. Before your next
installation, use UL’s Code Compliance Database to identify the
correlation between model codes and UL Certified products, as well as
find manufacturers of certified products.
Click here today
find up-to-date UL Listed products at the UL Code Correlation
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