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C57.12.38 - Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 480/240 V and Below

This standard is intended to define the electrical, mechanical, dimensional, performance, and interchangeability requirements of the transformers covered under this standard and to assist in the proper selection of such equipment. These requirements will provide a more standard transformer design, which will benefit manufacturers by reducing the number of designs. Users will be provided a document, which can be used to purchase a transformer of standard design without having to develop any additional standards. This will be helpful to less experienced users. It also will promote standardization of these types of transformers.
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