Thanks.

IEC60989:1991 Seperating transformers, autotransformers, variable transformers and reactors is mentioned as a normative reference in 60601-1-1. The "3rd" edition standard of 60601-1 is currently available to the public as a draft proposed standard for comment: 00/565498DC BS IEC 60601-1. Medical electrical equipment. General requirements for safety and essential performance .