517.30 Essential Electrical Systems
Code Continues to Spread
Grounding vs Bonding Seminar
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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 2005 Code Changes
Electrical Systems for Hospitals
By Mike Holt
This rule was revised to allow the use of listed
flexible metal raceways and listed metal-sheath cables for emergency
circuits, but only where it's impractical to run the emergency circuit
in a nonflexible metal raceway. (Note: Code text has been
What the Code says:
(3) Mechanical Protection of Emergency Circuits. Emergency circuit
conductors must be installed in one of the following wiring methods:
(1) Nonflexible metal raceways, Type MI cable, or Schedule 80 rigid
nonmetallic conduits, if not used to supply patient care area branch
(2) Schedule 40 rigid nonmetallic conduit or flexible nonmetallic
raceways encased in not less than 2 in. of concrete, if not used to
supply patient care area branch circuits [517.13(A)].
(3) Listed flexible metal raceways or listed metal-sheathed
a. When installed in listed prefabricated medical headwalls,
b. When installed in listed office furnishings,
c. Where fished into existing walls or ceilings, and not subject to
physical damage, or
d. Where necessary for flexible connection to equipment.
(Text new to the Code is underlined.)
Behind the change: The provision was added to facilitate
installations in renovated areas where the existing walls or ceilings
Two Powerful Tools in One: The Fluke 1587 and
Insulation Multimeters combine a digital insulation tester with a
full-featured, true-rms digital multimeter in a single compact,
Digging Up Trouble
One day while preparing to plant some shrubs in front
the home we'd just bought from an owner builder, I pushed my shovel
the soil and encountered what felt like a root. I pushed hard and heard
the sound one would associate with an electrical arc. I pulled the
shovel up and noticed that the tip was melted away and oxidized. I
opened the service main breaker and very carefully dug away the soil
from the site of the incident. I found a ¾-inch PVC conduit
the house footing about 5 inches below grade. The conduit terminated at
the edge of the footing and a 3-conductor 10 AWG direct-bury Romex
exited the conduit, routed underground to our well pump. My shovel had
shorted one hot leg of the 240VAC cable to the neutral. A call to the
previous owner yielded no response. I followed that with a letter,
pointing out the NEC requirement for direct-bury cable, which in this
case should have been 24 inches below grade. Finally after a threat to
go to court over the issue, he rerouted the new cable and buried it to
the proper depth.
Send your 200-word story to us and it may
appear in a future issue of CodeWatch. Authors of stories chosen will
Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. UL
Listed Cabinet Coolers produce 20 degree Fahrenheit air from an
supply of compressed air to cool electrical controls. Thermostat
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.
What's Wrong Here?
By Joe Tedesco
Got a guess for how this installation violates the NEC?
Web site to see the answer.
Hint: Is that a homemade extension cord poking through the
side of this panelboard?
By Mike Holt
Q. Can a stranded 12 AWG wire be placed under
screws for receptacles and switches?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Adjustable speed drive systems shall be protected
against motor overtemperature conditions by all but which of the
following choices? Note that the overtemperature protection is in
addition to the conductor protection required in 430.32.
- A thermal sensor embedded in the motor that's received
and acted upon by an adjustable speed drive
- An overtemperature protection relay that uses thermal sensors
embedded in the motor and meeting the requirements of 430.32(A)(2) or
- An adjustable speed drive controller with load and speed-sensitive
overload protection and thermal memory retention upon shutdown or power
- Motor thermal protector in accordance with 430.32
- All of the above
Visit EC&M's Web
for the answer and explanation.
The National Electrical Code Internet Connection, the No. 1
rated Code Web site in the world, offers the following FREE products:
Books, Code Quiz, DVDs, Graphics for PowerPoint, Newsletter, Online
Training, Posters, Simulated Exams, Software, Video clips, and Videos
Visit www.NECcode.com and stay
current with important industry issues.
Code News Updates
New Code Continues
Eight months after its release, the 2005 NEC is now in
effect in 14 states. "The quality of the 2005 NEC is what led us to
this decision," said Don Offerdahl, executive director of North
Electrical Board. "We know that the added provisions in the 2005 NEC
have strengthened public safety in our state."
Joining North Dakota in adopting the latest edition of the Code are
Colorado, Idaho, Massachusetts, Nebraska, New Hampshire, North
Ohio, Oklahoma, Oregon, South Carolina, Texas, Washington, and
Adoption of the 2005 Code continues, but the question
how far will it go? Do you expect your state to adopt it this year?
Visit EC&M's Web site to
The latest edition of the Code may be catching on, but it seems
versions haven't been getting the attention they deserve. Nearly
three-fourths of CodeWatch readers find violations on at least half of
their service calls.
Shows and Events
Grounding and bonding of electrical systems, sensitive
electronic, and communications equipment is the most important and
understood activity in the electrical, data processing, and
communications industry. At four two-day seminars, Code expert Mike
will explain the basics as well as the advance concepts necessary to
understand the practical grounding and bonding rules in the NEC for
systems not over 600V. Download
the conference brochure for specific dates and locations.
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