# Commission Regulation (EU) No 548/2014 of 21 May 2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers, Annex IV: Indicative Benchmarks

Extent: E+W+S+N.I.

At the time of adoption of this Regulation, the best available technology on the market for medium power transformers was identified as follows:
(a) Liquid-immersed medium power transformers: Ao – 20 %, Ak – 20 %
(b) Dry-type medium power transformers: Ao – 20 %, Ak – 20 %
(c) Medium power transformers with amorphous steel core: Ao-50 %, Ak.
The availability of material to manufacture transformers with amorphous steel core needs further development, before such values of losses can be considered to become minimum requirements in the future.

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Source: https://www.legislation.gov.uk/eur/2014/548/annex/IV (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-548/annex-IV
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.