BS EN 50708-2-1:2020 pdf free.Power transformers - Additional European requirements. Medium power transformer - General requirements. BS EN 50708-2-1 The tables below indicate the maximum level of losses for no-load losses and for load losses for TIER1 and TIER2.TIER1 has been applied since 1 July 2015 for the values of losses following Commission Regulation (EU) No 548/2014 of 21 May...