240.24 -- Location of Overcurrent
A Blast From the
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Top 2005 Code Changes
240.24 -- Location
of Overcurrent Protection Devices
By Mike Holt
New text specifies the maximum height that an
overcurrent device can be installed and still be considered "readily
accessible." This new text coordinates with similar language contained
in 404.8(A) for switches.
(Note: Code text has been paraphrased.)
What the Code says:
Accessibility. Circuit breakers and fuses must be readily accessible
they must be installed so the center of the grip of the operating
of the fuse switch or circuit breaker, when in its highest position,
isn't more than 6 ft 7 in. above the floor or working platform,
unless the installation is for:
(1) Busways, as provided in 368.17(C)
(2) Supplementary overcurrent protection devices (240.10)
(3) For overcurrent devices, as described in 225.49 and 230.92
(4) Overcurrent protection devices can be mounted above 6 ft 7 in.
if they are next to the equipment they supply and are accessible by
portable means [404.8(A) Ex. 2] (Text new to the Code is
Behind the change: "Readily accessible" means located so it
can be reached quickly without having to climb over or remove
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A Blast From the Past
While working as a service tech for an electrical
company, I was called to a residence to determine why the homeowner
a tingle from the faucet in the bathroom. When I measured the voltage
from the faucet to the metal drain ring my meter read 55V. Since it was
an older house in a historic neighborhood, all types of possible
problems crossed my mind. After working for several house without
finding the source, we pulled the meter, but the voltage was still
there. We called the local power company to unhook the transformer, but
it still didn't go away. Finally, we persuaded the power company to go
to the neighboring houses to disconnect their power to try to find the
problem. We finally located the culprit three doors down. A faulty
electric water heater element was bleeding voltage back through the
water line, through the main water line, back to the house, and to the
closest ground, which was through the trim ring on the sink. After
persuading the other homeowner they had a problem, the water heater was
grounded, the element was replaced, and the tingle went away.
Cave City, Ark.
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
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What's Wrong Here?
By Joe Tedesco
How does this
installation violate the NEC?
Hint: This can be found at a downtown Denver
By Mike Holt
Q. Must metal siding and metal framing members
See the answer.
A general power and lighting feeder tap that consists
1/0 AWG THHN conductors has been made to 500 kmcil THHN feeder
conductors in a properly sized junction box. The 500 kcmil feeder
conductors are protected by a 400A OCPD at the point where they receive
their supply. The 1/0 AWG feeder tap conductors are protected at their
termination point by a 150A overcurrent device. The feeder equipment
grounding that runs with the 500 kcmil feeders is 3 AWG. What's the
minimum size equipment grounding conductor required as part of the
feeder tap circuit conductors?
- 8 AWG
- 6 AWG
- 3 AWG
- 1/0 AWG
Visit EC&M's Web
for the answer and explanation.
The National Electrical Code Internet Connection, the No. 1
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Faces of the Code
Your Name Here
Since starting the Faces of the Code column more than a
year and a half ago, we've met a lot of interesting members of the Code
community. And if we've learned anything, it's that everyone has a
to tell. But we can't find them all! Are you a Code-making panel
Do you want to see yourself in Faces of the Code? Do you know someone
who your fellow CodeWatch readers should meet? Tell us. Send us an
e-mail and nominate yourself or a colleague.
Visions of Vegas
It's still several months away, but if you want to get
cheap airfare, you better start planning for the necforum now. (See the
story below.) You should
have a game plan to get the most out of your trip, too. What do you go
to conferences for? Visit EC&M's
Web site to tell us.
The music and movie industries use the word "indie" a lot, and the
electrical industry may pick it up soon, too. Nearly 90% of CodeWatch
readers are unhappy with the lack of independent voices on Code-making
Shows and Events
It's the year of the Code, but if you fly to Las Vegas
for the 2005 NFPA World Safety Conference & Exposition just for a recap
of changes in the latest version of the NEC, you'll be missing a lot.
five-day event runs June 6 - 10 at the Mandalay Bay Resort &
Center and will offer seminars for keeping your employees out of harm's
way and presentations of CSI-like investigations of high-profile
electrical fires. Hey,
everyone's favorite millionaire quiz host, Regis Philbin, will even be
Web site to register before the early bird discount expires.
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