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The core and windings are manufactured with the highest quality material and meets all specifications necessary for oil immersed transformers. Each transformer is pot tested to 5000 VDC for 1 minute before installation.Transformer winding is baked and braced to handle short circuit conditions without causing rupture of windows. Transformer steel is of the highest grade M4 material and all windings are copper and splice free. oil cooled transfomers, transformers, dc/ac power supplies