• Home
  • Services
  • About Us
  • Contact Us
  • FAQs
  • Blog
  • Careers
  • Electro-Motion is always proactive in scheduling and completing preventative maintenance. Their follow up and documentation is excellent. They are very responsive to my requests for additional information and never complain when I need emergency service.

    Dave Wiggins
    Facility Manager
    Sacrum Services

    What is "Meggering"(TM) or "Insulation Resistance Testing"?

    May 1, 2013

    Insulation resistance testing is a specialized procedure where the integrity of the electricity producing portion of your generator set (alternator) is tested in a safe & isolated condition. During the test, DC voltage is applied to the alternator windings to determine if the insulation is damaged and may cause a short circuit under normal operation. This test is a crucial part of maintaining a reliable on-site emergency power producing plant and is recommended annually by NFPA 110. This test can identify and prevent catastrophic failures to not only the generator set, the Automatic Transfer Switch as well as anything on the entire emergency load circuit.

    This test identifies weakness of the dielectric strength of the internal components that may under normal conditions not be detectable until a total failure occurs. Identifying these impending failures is a relatively simple process and typically will not impact any supported building systems. If problems are found, steps can be taken to ensure your on-site power needs are met and costly damage to your entire emergency circuit can be avoided.


    «Return to Blog-List