Maintenance Misalignment, Part
Failure-Mode Coding for
NEC in the Facility
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e-newsletter is brought to you from the
publisher of EC&M magazine.
MRO Insider addresses topics such
Working with management and supervision
National Electrical Code® on the production floor
Safety procedures and programs
Equipment maintenance and testing tips
Managing motors and generators
Trends in training and education
Managing energy use
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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.
Misalignment, Part Two
If your maintenance program is misaligned with your
mission, resources, or priorities, how can you line it back up?
a way to get started:
Now you can clearly see which activities consume the most maintenance
labor. By addressing those activities first, you maximize recovery of
- Access maintenance records for the past year.
- Sort completed maintenance activities by labor cost (or time
greatest to least.
- Plot the activities on a bar chart, in descending order of labor
To read more on this story, visit EC&M's Web
A good CMMS is more than a system for processing work
orders. It provides a variety of tools for analyzing maintenance data.
The usefulness of those tools depends on the accuracy and granularity
(depth of detail) of the data provided.
To avoid guesswork and confusion due to granularity problems,
your data in a logical hierarchy. For example, instead of listing
"contact corrosion" and "lead corrosion," put the key term first so you
have "corrosion, contact" and "corrosion, lead." This makes logical
filtering and sorting possible. It also enables you to have drill-down
and overviews in the same system.
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A complex conveyor system threads its way through the
plant. This system has a large number of 10-hp motors, and you replace
one every few weeks. Your company's policy is not to send "throw away"
motors out to your motor shop for a post-mortem.
Today, yet another motor failed. You noticed a burnt smell. What's a
compelling reason to send this motor out for a post-mortem despite the
policy, and what should you look for while it's being examined?
Web site to see the answer.
Coding for Motors
How can you solve for recurring causes of motor
A key step is to know what those causes are. Toward that end, provide
motor repair forms with motor-specific failure mode codes. Start the
list with a few likely causes, and update after each motor post-mortem
so your form matches your actual problems.
The form should also include checkboxes for these observations:
…and these measurements:
- Burnt smell.
- Water intrusion.
- Phase-to-case fault.
- Phase-to-phase fault.
- Open winding.
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NEC in the
As the problems of the economy have dragged on, most
companies have stepped up cost-cutting. This is a good idea if done
intelligently, but sometimes it’s not. The budgets for electrical
projects and plant maintenance are favorite targets for the infamous
"10% reduction" target issued without regard to operational realities.
The results can be expensive, or even fatal, to the corporation.
To read more on this story, visit EC&M's Web
Personal protective equipment (PPE) is the last line of
defense between you and a hazard. Inadequate PPE or incorrect use of
can result in painful injuries or even death.
General PPE (e.g., safety glasses) protects you from general
Some PPE (e.g., canister respirators) protects you from specific
hazards. Always assess the area and the work for the hazards that are
likely to be present, then obtain the PPE designed for those hazards.
Before using any PPE, inspect it to ensure it's serviceable. If it's
wearable PPE, ensure it fits properly. If it's non-wearable (e.g.,
blanket), ensure it's installed and secured properly.
As noted, PPE is a last line of defense. Reduce hazards and
your exposure to them by following your facility's safety practices and
applying NFPA 70 around electrical equipment.
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