445.18 - Disconnecting Means
Hang Up and Try
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
By Mike Holt
A change to this section permits a single generator to
have multiple disconnecting means to allow flexibility and to provide a
safer environment when maintenance is necessary. (Note: Code
has been paraphrased.)
What the Code says:
have one or more disconnecting means that disconnects all power,
(1) The driving means for the generator can be readily shut down,
(2) The generator isn't arranged to operate in parallel with
generator or other source of voltage. (Text new to the Code is
Behind the change: This rule is necessary because a single
generator can be used to supply emergency, legally required, as well as
optional standby power through different transfer switches. Be careful
if one generator is used to supply emergency, legally required, as well
as optional standby power, then there must be at least two transfer
switches: one for emergency power and another for legally required as
well as optional stand-by power [700.6(D)].
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,
Hang Up and Try Again
A few years ago, while upgrading a 100A service panel
located in a residential garage, I noticed what appeared to be two
TW or THW wires about the size of 8 AWG entering the panel without
conduit (a not-uncommon practice of do-it-yourselfers). As I removed
incoming wires for the replacement, I found that what I thought were
wires were actually two very old 2-pair phone cables. The four 20 AWG
phone wires in each had been twisted together and connected to a
30A breaker, which fed a garage. Why there had never been a fire, I
no idea. The only load on the circuit was a yard light, but there was
evidence that there had been other lights and receptacles connected at
one time. Needless to say, all was replaced.
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: Recycling isn't always a good thing.
By Mike Holt
Q. What size grounding electrode conductor is
required for a 1,200A service supplied with three sets of 600 kcmil
conductors per phase?
Visit EC&M's Web
site to see the answer.
By Steven Owen
What's the minimum size THHN insulated conductor
required for the power conversion equipment included as part of an
adjustable speed drive system that uses a bypass device. The rated
of the power conversion equipment is 36A. The motor is rated 30 hp,
480VAC, 3-phase. The terminals at the power conversion equipment are
- 10 AWG THHN
- 8 AWG THHN
- 6 AWG THHN
- 4 AWG THHN
Visit EC&M's Web
for the answer and explanation.
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current with important industry issues.
As Nightmare Installations shows, there's no shortage
shoddy electrical work. How often do you run across installations with
Code violations when you perform service and maintenance work? Visit EC&M's Web site to tell us.
"Get on with it!" That's what CodeWatch readers are saying about
Code-making panels' approach to adding GFCI requirements to the NEC.
Although less than one-third said the Code has adequately addressed the
need for GFCIs, 40% said it was time to apply an across-the-board
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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