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  • I have had the pleasure of working closely with Electro-Motion on my fire pumps and emergency generator. They correct problems on the spot and report on anything which may need to be corrected in the future, keeping equipment in top working order saves us all in emergency repairs and costly down time.

    Scott W. Varady
    Director of Engineering
    San Ramon Marriott Hotel

    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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