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  • Prior to contracting with Electro-Motion, we did our own maintenance, which was very little due to lack of qualified staff and budget concerns. We have four diesel units at our various high schools and none were in great operating condition. Electro-Motion came in and provided us with professional services and brought our generators up to full operational capability. We are also considered emergency shelters due to unforseen natural disasters; and we need our generators to support this type of operation.

    John Schultz
    Director of Operations/Maintenance/Health-Safety & Transportation
    Jefferson Union High School District

    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.


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