Call the Motor Coroner
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.
One of the exciting discoveries in brain research is
that the brain “maps” hand tools as if they were part of the body.
The more you use specific tools, the more pronounced this effect
To read more on this story, visit EC&M's Web
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Recently, you've come across complaints from operators
about a couple of drinking fountains in a production area. It turns out
that similar complaints have been made for quite some time, but never
resolved. The complaints range from a tingling sensation to a shock
taking a drink.
The complaint history doesn't show incidences of this problem in the
summer months. The repair history repeatedly shows “unable to
duplicate the problem.”
The fountains have been swapped with ones where the problem hasn't
been reported, and the problem stays in the original location.
Maintenance has conducted insulation resistance tests on the branch
circuit wiring five times, and the results show nothing to indicate
One theory is the operators are trying to amuse themselves by
reporting a problem that doesn't exist. Could another theory explain
what's going on? If so, what would it be and how do you investigate it?
Visit EC&M's Web
site to see the answer.
Call the Motor
You can improve motor uptime by treating the repair of
any motor as part of a larger motor failure reduction program (MFRP)
focused on solving causes (e.g., repetitive and root). This sounds good
in theory, but the lack of an immediate reward is why not everyone has
such a program.
Because a good MFRP solves underlying downtime causes, it reduces
number, duration, severity, and cost of downtime incidents. It also
increases system predictability for better planning of production.
To read more on this story, visit EC&M's Web
NEC in the
If you have ignitable fibers on site, you can choose to
use Art. 506 requirements for the zone classification system as an
alternative to the division classification system covered in Arts.
500, 502, and 503 for Zones 20, 21, and 22.
Some key concepts/definitions [506.2]:
- Dust-ignitionproof refers to enclosing equipment in a manner that
keeps sparks and flames contained within the enclosure and keeps dust
- Dusttight enclosures are constructed to keep out dust (under
specified test conditions).
- Nonincendive items are not capable of igniting the flammable gas,
vapor, or dust mixture. Art. 506 breaks this concept out into four
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