Tractition transformers EN 50329 voltage Preferred duty classes

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Hello everyone ,

We want to order transformers. But when we select the transformers , seller must to the duty cycle test ,but contractor want do test IXB , but our other project contactor made this test criteria VI (EN 50329:2003 Preferred duty Classes).
My quastion what is the different VI and IXB what is the important our selection.If we do VI, will it meet the criteria for IXB?

Thanks for support !

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