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  1. rodelec

    noise (hum) vibration in high current switchboards

    We have installed numerous Switchboards in a telephone exchange with ratings from 1000 amps up to 6000 amps. Some of these switchboards as well as other existing switchboards "hum" when under load. The hum appears to be a low frequency so we assume it is at supply frequency (50Hz). Harmonics...

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