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Customer has a 10S67F single phase transformer and needs wiring assistance regarding the changing of primary connections under load.

There are 3rd. party load break automatic tap changers made in the industry that can do this. These devices will break one connection before making another and absorb some of the energy from the collapsing field. This is necessary to avoid shorting out a portion of the winding.
(On Square D/Schneider Electric transformers, taps should never be changed with the transformer energized, and consequently never under load.)

CTA-ID : 2033637
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