This part 2 of IEC 61558 applies to associated power transformersfor switch mode power supplies, single-phase or polyphase,air-cooled: separating transformers; isolating transformers; safety isolating transformers, 10 kVA for single-phase transformers; 16 kVA for polyphase transformers.This standard is applicable to dry type transformers. The windingsmay be encapsulated or non-encapsulated.It has the status of a group safety publication in accordance withIEC Guide 104This part 2 supplements or modifies the corresponding clauses inIEC 61558-1