You and CMMS, Part 2
Switches, Part 1
NEC in the Facility
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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.
You and CMMS, Part
One feature of a computerized maintenance management
system (CMMS) is the ability to track material usage and labor costs.
Some maintenance departments rely on the techs to record time and
materials. Usually, techs “fill out paperwork” several hours after
work completion, guesstimating everything. A “solution” to this is
the work order writer guesstimates the job in advance. Another approach
eliminates guesswork. The clock starts when a tech “checks out” a
work order and stops when the tech turns it in. For materials, the tech
scans barcodes and enters the work order number. With this third
approach, you have efficiently obtained accurate information you can
analyze to see where your costs actually are.
Perform two-man jobs alone.
Now you can work in two
places at once. With the new Fluke 233 Wireless Remote Display
Multimeter you don’t need the help of another person when reading the
The office workstations have surge strips. Users plug
their computers and monitors into these, and occasionally use the extra
receptacles for various other small loads. Around the first of the
there was a rash of computer failures. The vendor that does your
computer support took a random sampling of these surge strips and found
the metal oxide varistors (MOVs) were all blown. The strips were still
supplying power, but they weren't providing any surge suppression.
Further investigation revealed nearly every surge strip had this same
kind of damage, and they were all replaced.
Recently, computer failures began happening again. This vendor did
another sampling of the surge strips and found the blown MOV problem
returned. How do you solve this problem and prevent another recurrence?
website to see the answer.
Thumb Switches, Part 1
We're accustomed to touch screens, which are a part of
nearly all mobile devices. Touch screens have been in use for a long
time. By the mid-1980s, they were fairly standard on digital control
systems (DCS), such as those used for refineries and coal
Small applications have few inputs to change, so the need for a
screen and its added complications is much less. Thus, thumb switches
are widely used because of their simplicity and ruggedness.
What if your thumb switch controls appear not to work? Fortunately,
these are easy to troubleshoot.
website to see the answer.
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NEC in the
Here's a question for you. What NEC Articles are the
most important for proper surge protection? If you answered, “Art.
250, 280, and 285,” then you're correct. But do you know where these
apply, and do you know what other areas of the NEC also have bearing on
The answer to the second part of that question is “Chapters 1-4,
and Art. 90.” In Chapter 1, for example, people tend not to pay much
attention to Art. 100. This single fact explains the existence of many
power quality problems. You understand why, when you read the Art. 100
definitions of grounding and bonding. Mix these up, and your surge
protection devices act more like surge recirculation devices.
Now, where do these three Articles apply?
website to see the answer.
Decide whether the following statement is true or
A motor and its 480V supply transformer are each provided with a ground
rod, so it's safe to put one foot on each ground rod. Now, give the
reason for your answer.
Many people will answer “true,” and their reason will be that
two rods are at equipotential because both are grounded. The correct
answer is actually “false.” Earth has significant resistance, and
thus there are differences of potential between two grounding points.
This is why, for example, we use the fall of potential method in
But doesn't electricity take the path of least resistance? Draw a
parallel circuit with a 100Ω resistor and a 200Ω resistor,
solve for current in each path. As you can see, electricity doesn't
the path of least resistance. Grounding does not remove potentially
lethal shock hazards.
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