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September 8, 2009 A Penton Media Publication Vol. V No. 17



CONTENTS
EGC Maintenance

Electrical Troubleshooting Quiz

Making Motor Repairs Stick

NEC in the Facility

Safety



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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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    The designations "National Electrical Code" and "NEC" refer to the National Electrical Code®, which is a registered trademark of the National Fire Protection Association.

     
    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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