You and CMMS, Part 4
Some Repairs Matter More Than
Others, Part 1
NEC in the Facility
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MRO Insider addresses topics such
Working with management and supervision
National Electrical Code® on the production floor
Safety procedures and programs
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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
A computerized maintenance management system (CMMS)
provides a full suite of tools for managing your work order system.
Unfortunately, many CMMS users simply automate their previous system.
This typically means making an inefficient process faster instead of
actually improving it.
Leading CMMS products incorporate best practices gleaned from years
of working with end-users and maintenance consultants. Rather than just
providing a means to speed inefficient systems, these products provide
tools and information you can use to reduce overhead and improve
Thoroughly study your CMMS work order system management system and
see what you can learn. If your CMMS vendor has a user group, then see
what it offers.
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In one of the buildings on your campus, workers have
been complaining about "the terrible lighting." Complaints include
excess shadows, low light levels, eye strain, and inability to read box
labels without a flashlight. Over the summer, the complaints weren't
acted upon because a relamping was scheduled for September. But it's
October, and the complaints persist.
We can see the design matches the application, and the lamps match the
specifications. What could be causing this "terrible lighting"
problem, and what should you do first?
- The relamping contractor used the correct replacement lamps, so
not a wrong lamp issue.
- Records show these complaints started a couple of years ago, long
after any reconfiguration in lighting design or equipment
Visit EC&M's website
to see the answer.
Some Repairs Matter
More Than Others,
In any well-run production facility, operations
management knows the following information for each piece of production
They know which equipment makes the most money for the company and how
many hours it must run to fill open orders by X deadline. You also need
to know this.
- Revenue per hour, both capacity and actual.
- Hours of uptime required to realize 100% potential revenue.
- Gross margin (or similar metric) per lot, batch, or run.
To read more on this story, visit EC&M's website.
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NEC in the
The 1993 revision of the NEC brought us Art. 90. It's a
short (three pages in the loose-leaf edition) but important
to the NEC. However, did you know the NEC also contains an Art. 80? You
won't see this in the Table of Contents. If you open the front cover
just start flipping pages, the first Article you will find is Art. 90.
Then you get to Art. 100.
So where is Art. 80, and what exactly does it say?
To find Art. 80, you need to look in the back of the NEC.
Specifically, you need to look at Annex H. You can think of Art. 80 as
supplement to Art. 90. It is seven pages long in the loose-leaf
Article 80 addresses five major functions:
- Electrical inspections.
- Electrical fire investigations.
- Review of electrical construction plans.
- Design, modification, construction, and maintenance of electrical
- Electrical equipment at special events.
To read more on this story, visit EC&M's website.
Your digital multimeter (DMM) should have a CAT rating
on its case. The CAT rating gives you a transient voltage range for
which that DMM (or any other electrical test instrument) is safe to
If you look at your DMM and don't see this rating, then you cannot know
its safety level. Destroy and discard that DMM.
The categories, in ascending order of transient voltage withstand
capability, are CAT I, CAT II, CAT III, and CAT IV.
The manufacturer achieves a given CAT rating through various means.
The basic strategy is to put higher resistance between potential points
of crossover within the device. If you compare a CAT I multimeter to a
CAT IV DMM, you'll notice the lead jacks on the CAT IV are spaced much
farther apart than those on the CAT I.
We'll look more closely at CAT ratings in our next issue.
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