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CONTENTS
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EGC Maintenance
Electrical Troubleshooting
Quiz
Making Motor Repairs Stick
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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The designations "National Electrical Code" and "NEC" refer to the
National Electrical Code®, which is a registered
trademark of the National Fire Protection Association.
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Maintenance
EGC Maintenance
How well do you maintain your equipment grounding
conductors (EGCs)? Do you maintain them at all? If so, then how?
First, it helps to get the terminology correct. The EGC has nothing
to do with grounding. In fact, it's pointless to ground load side
equipment. With the 2008 revision, the NEC made great strides toward
correcting misuse of the word "grounding." But it still has to cross
the
finish line on that problem; thus, it prescribes "grounding" conductors
that don't do grounding.
The Art. 100 definitions of "grounding" and "bonding" cut through
the
confusion. Based on those definitions, an EGC isn't a grounding
(connect to earth) conductor. The EGC is a bonding conductor. As
such, it forms a low-resistance metallic path.
To read more on this story, visit EC&M's Web
site.
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Repair
Electrical
Troubleshooting Quiz
A critical 75-hp motor has failed three times in as
many
years. Each time has been preceded by a loud rattling and excessive
shaking that lasted a few minutes. After the second time, you switched
to a different manufacturer. This third failure has you on the hot
seat.
Should you try a third manufacturer, or should you do something else?
Visit EC&M's
Web site to see the answer.
Making Motor
Repairs Stick
To make a motor repair stick, follow these three
tips:
- Before bringing the motor to the installation area, manually turn
the rotor. It should turn freely and noiselessly. Nobody likes to take
3
hr to install a motor only to yank it back out again due to a bent
shaft.
- Before connecting motor leads, conduct insulation resistance tests
on its windings. This dries condensation from the windings before
applying full current, and it provides baseline maintenance data.
- Before connecting the motor to its load, PM the load or at least
check it (e.g., check gearbox oil).
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Operation
NEC in the
Facility
Exactly how you can classify a location depends on the
properties of the ignitable fibers or flyings that may be present and
on
their concentration [506.5].
- Summary of Zone 20 definition: Ignitable fibers or flyings are
consistently present and are present for long periods [506.5(B)(1)].
- Summary of Zone 21 definition: Ignitable fibers or flyings are
likely to exist under normal operations, during repair, or during
breakdown [506.5(B)(2)]
- Summary of Zone 22 definition: Ignitable fibers or flyings are
not likely to exist under normal operations
[506.5(B)(3)].
Safety
Fall protection includes nets and safety harnesses,
which serve to arrest a fall rather than prevent it. Before working on
any elevation, assess the fall protection needs. Choose the personal
protective equipment (PPE) that is most appropriate for that particular
location and the work you're doing.
To read more on this story, visit EC&M's Web
site.
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