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  1. myersro

    Converting from ungrounded to grounded 480 system

    We presently have a 480vac Y ungrounded distribution system. We bring in 69kv from the utility and reduce it to 12470v in our yard substation. Then we distribut 12470 delta into the building and reduce it to 480 wye in 7 substations. When we have a ground fault in our system, we detect it with...

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