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June 23, 2009 A Penton Media Publication Vol. V No. 12


CONTENTS
Maintenance Tools

Electrical Troubleshooting Quiz

Call the Motor Coroner

NEC in the Facility


About This Newsletter
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
    Maintenance Tools
    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 becomes.

    To read more on this story, visit EC&M's Web site.


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    Repair
    Electrical Troubleshooting Quiz
    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 when 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 impending failure.

    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 Coroner
    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 the 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 site.


    Operation
    NEC in the Facility
    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 out.
    • 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 definitions.


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