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  1. elenasdad

    Power Cable Hum at Motor Startup - 3 Phase, 40 Hp, Line Start

    Motor runs fan for cooling tower on roof of 15 story apartment building. A loud humming sound is generated for about 2 secconds at startup that is heard throughout the building. It sounds similar to a 120 Hz tranformer noise. The noise appears to be generated by the vibration of the power feed...

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