210.52 -- Dwelling Unit
Faces of the Code
About this Newsletter
e-newsletter is brought to you from the
publisher of EC&M magazine.
Let you know what could be changing in the Code®.
Help you brush up on your ability to apply the Code®.
Test your knowledge of the Code® with a Q&A format.
Introduce you to the people who vote on the rule changes.
Provide information on upcoming Code® seminars and shows.
Give you an opportunity to sound off on Code®-related issues.
We want to make sure we're providing you with the content you need to
better manage your business or enhance your technical skills. E-mail us and
let us know what you want to see in future issues of this e-newsletter.
We will do our best to address your request in a future issue of
To sign up
for your free subscription, click here: Subscribe|
To unsubscribe from this newsletter click here: Unsubscribe
To get this newsletter in a different format (Text, AOL or HTML),
or to change your e-mail address, please visit your profile page to change your delivery
issue? Visit the
CodeWatch archive on EC&M's Web site.|
Tell a friend about CodeWatch
Do you know
of someone who'd like to receive CodeWatch? Visit the subscriber site, enter their e-mail
address and spread the wealth!|
To find out
how to advertise in this newsletter, e-mail David Miller or call
at (312) 840-8497.
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
Dwelling Unit Receptacle Units
By Mike Holt
A rule added to this Section requires at least one
outdoor receptacle outlet for each grade level dwelling unit with an
individual entrance. (Note: Code text has been paraphrased.)
What the Code says:
Receptacle -- Dwelling Units
One-Family Dwelling Unit. Two receptacle outlets must be installed
outdoors for each one-family dwelling unit, one at the front and one at
the back of the dwelling unit, no more than 61/2
ft above grade.
Two-Family Dwelling Unit. Each dwelling unit of a two-family dwelling
that is at grade level must have two GFCI protected [210.8(A)(3)]
receptacle outlets installed outdoors for each dwelling unit, one at
front and one at the back of each dwelling, no more than
61/2 ft above grade.
Multi-family Dwelling Unit Building. At least one receptacle outlet
accessible from grade level and not more than
ft above grade must
be installed at each dwelling unit that has an individual entrance at
grade level. (Text new to the Code is underlined.)
Behind the change: This change is intended to help remove the
need to run an extension cord through a door or windows to provide
for outdoor equipment, such as lawn mowers and hedge clippers, radios,
etc. The 2005 NEC doesn't specify the rating of the required
but all 15A or 20A, 125V receptacles located outdoors of a dwelling
must be GFCI protected [210.8(A)(3)].
Fluke T5 Electrical Testers allow you to troubleshoot faster and
than traditional solenoid testers. They let you check voltage,
continuity and current with one compact tool. With the T5, all you have
to do is select volts, ohms, or current and the tester does the rest.
OpenJaw™ current lets you check current up to 100A - without
breaking the circuit.
Not-So Solid Ground
While adding some outlets to an old house, I noticed
receptacles were the grounded type. When I inserted my outlet tester,
the lights indicated it was grounded. I looked at the wires coming out
of the panel and noticed they were old cloth 2-wire without a ground.
Upon opening up one of the outlets I found a piece of wire that ran
between the ground and neutral screws. I was outraged, to say the
The owner of this newly purchased house was under the impression the
house was grounded because the inspection indicated it was. I don't
blame the inspector, but it makes me wonder how many other homes are
like this. The only way to know for sure is to open up a few boxes,
because even your meter will show 120V between the hot and ground.
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
Low cost Cabinet Coolers stop electronic control downtime due to 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
What's Wrong Here?
By Joe Tedesco
How does this
installation violate the NEC?
Hint: This lighting fixture was installed outdoors with wood
By Mike Holt
Q. Can a 15A or 20A, 125V receptacle on an
elevated dwelling unit porch serve as the required outdoor receptacle
See the answer.
By Steven Owen
A 480VAC, 3-phase, 4-wire wye-connected electrical
distribution in an existing facility is protected against short
by "fully-rated" overcurrent protective devices. The circuit breakers
the service equipment have a 42kA interrupter rating. The calculated
fault current for the existing electrical system at the service
equipment -- fed from a 1,500kVA transformer (480VAC secondary, 5.75%
was calculated to be about 31,378A. The utility is going to
change the transformer that feeds the building from 1,500kVA to
2,500kVA. The calculated fault current for the system fed from a new
2,500kVA transformer (480VAC, 5.75% Z) is approximately 52,298A.
Purchasing new distribution equipment that is "fully rated" is out of
the question; the existing electrical equipment must remain. Motor
contribution during short-circuit conditions is negligible, and is
connected on branch circuits fed from an MCC downstream of the service
equipment. If "series rated" protection is provided, which of the
following minimum requirements must it meet?
- A fusible switch that uses current-limiting fuses with
65kA interrupter ratings shall be installed ahead of the existing
circuit breakers in the service equipment. This can be accomplished by
field design and installation.
- A current limiting circuit breaker with a 65kA interrupter rating
shall be installed ahead of the existing circuit breakers in the
equipment. This can be accomplished by a field design and
- A fusible switch that uses current-limiting fuses with 65kA
interrupter ratings is permitted to be installed ahead of the circuit
breakers in the service equipment. This installation must be designed
an electrical engineer engaged primarily in electrical design and
maintenance, and field installed per the engineer's stamped and
- The system may remain as is.
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.
Faces of the Code
Chair, Code-Making Panel 3
Dick Owen has to bite his tongue a lot these days.
Twenty years in the electrical inspection office for the City of St.
Paul, Minn., have taught him to speak up when he sees something he
doesn't like, but since becoming the chair of Code-Making Panel 3 in
2002, he's had to learn the art of neutrality. As the panel's
"traffic cop," he's not allowed to weigh in on proposed changes.
Instead, he manages the approval process and keeps it moving. And it
hasn't been easy. "I have to keep my mouth shut on a lot of things
because I have an opinion," he says.
For every time he can't let his fellow panel members know what's on
his mind, though, he has plenty of opportunities to point out problems
to Twin Cities contractors and explain what they can do to fix them.
earning his Minnesota state electrical license in 1976, Owen worked for
various electrical contractors and the city before finally settling in
the inspector's office in 1985. "I looked around and thought, 'Do I
really want to be digging ditches and jackhammering in 100° or
-20° until I'm 65 years old?'" he says.
He soon found, though, that while the job kept him out of the
elements, it lacked what made being an electrician so rewarding. "You
have a feeling of accomplishment when you do electrical wiring," he
says. "You can drive by a building and tell your kids, 'I helped wire
that place.'" Instead, he's come to see that being an inspector has an
even greater -- albeit less tangible -- benefit. "If you do your job
right, nothing happens," he says. "There are no fires, no
electrocutions, and no power outages. You get the feeling of
accomplishment in knowing that you kept people safe."
Now the city's senior electrical inspector, he spends most of his
time supervising his eight inspectors, but even though he isn't in the
field, he still gets to offer an opinion and make a ruling
And that means studying every bit of the Code -- even the parts he may
have disagreed with in committee. "As inspectors, that's our area of
expertise," he says. "You have to keep up."
Dick Owen had several years as an electrician under his
belt before becoming an inspector, and he can't imagine hiring someone
for the job now who hasn't put in considerable time in the field. What
do you think? How many years should someone work as an electrician
before becoming an inspector? Visit EC&M's Web site to tell us.
For the 2005 Code, the TCC rolled Art. 517 into
a broader Code-making panel, but more than 50% of you
think it was a mistake. If it makes you feel better, take it as a sign
that hospitals are safer than
they used to be.
You are subscribed to this newsletter as <*email*>
For questions concerning delivery of this
newsletter, please contact our Customer Service Department at:
US Toll Free: (866) 505-7173
International: (402) 505-7173
Primedia Business Magazines & Media
9800 Metcalf Avenue
Overland Park, KS 66212
Copyright 2005, PRIMEDIA. All rights reserved. This article is
by United States copyright and other intellectual property laws and may
not be reproduced, rewritten, distributed, re-disseminated,
displayed, published or broadcast, directly or indirectly, in any
without the prior written permission of Primedia Business Magazines &