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CONTENTS
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Insulation Resistance
Testing, Part 1
Electrical Troubleshooting
Quiz
Catastrophic Failure
Repairs
NEC in the Facility
Safety
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About This Newsletter
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This twice-a-month
e-newsletter is brought to you from the
publisher of EC&M magazine. MRO Insider addresses topics such
as:
Working with management and supervision
National Electrical Code® on the production floor
Safety procedures and programs
Troubleshooting techniques
Equipment maintenance and testing tips
Managing motors and generators
Trends in training and education
Managing energy use
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Maintenance
Insulation
Resistance Testing, Part 1
Acceptance test reports can tell you the condition of
your cables when they were installed, but they tell you nothing about
the present condition. Startup alone can radically change the data.
To ensure reliability, you need to:
- Perform insulation resistance testing at the correct intervals.
- Trend the results over time.
To read more on this story, visit EC&M's Web
site.
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Repair
Electrical
Troubleshooting Quiz
Over the past several months, power problems have
plagued the people working in the administrative offices. The most
common complaint is nuisance breaker tripping. People have also
reported
“static shock” from various surfaces such as the sink in the coffee
pot area. In addition, a rep from a major customer account complained
about “a nasty shock” from a photocopy machine.
What are some things you should look for in order to resolve these
problems?
Visit EC&M's
Web site to see the answer.
Catastrophic
Failure Repairs
A “catastrophic” failure is one from which recovery
is impossible. Although catastrophic failure of a major system often
leads to “we have to remove all this damaged stuff so we can restore
operations,” don't be too hasty.
The response to catastrophic failure of major systems (or equipment)
usually entails large capital expenditures, insurance claims,
regulatory
filings, reports to senior management, and the services of a forensic
engineer. The many chefs in that particular kitchen are all handling
the
hot potato known as "blame."
To read more on this story, visit EC&M's Web
site.
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Operation
NEC in the
Facility
One possible problem in this issue's Electrical
Troubleshooting Quiz is an isolated ground (IG).
- Some equipment manufacturers “require” an IG receptacle.
- Someone may install an IG to solve power quality problems.
- Often, IG installations are wired incorrectly and produce new
problems without solving the old ones.
One IG miswiring scheme involves running the IG equipment grounding
conductor (EGC) to a separate ground rod. Because this electrode isn't
wired to the EGC of the source (service or derived system), it creates
a
potentially lethal difference of potential.
To read more on this story, visit EC&M's Web
site.
Safety
When a person drowns, the body is “on fire” with
demand for oxygen the lungs can't provide. However, drowning isn't the
only way to bring on painful lack of
breath. It can also occur over time.
When you work around paints, coatings, dusty materials, adhesives,
or
solvents, your lungs are at risk. Your first line of defense is good
ventilation, but you may also need to wear a respirator. Note that a
painter’s mask is useless against fumes, gases, and vapors. Use the
respirator that conditions require.
Protect your lungs by following these three rules:
- Ventilate to reduce concentrations.
- Use the proper respirator. At a minimum, see the MSDS of the
materials with which you’re working.
- Reduce total exposure by limiting the time you’re in the hazardous
area.
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