# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Appendix 10

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

Standard torque loss values – other torque transferring components
Calculated standard torque loss values for other torque transferring components:
For hydrodynamic retarders (oil or water), the retarder drag torque shall be calculated by
Tretarder=10istep-up+2istep-up3×nretarder10002
For magnetic retarders (permanent or electro-magnetic), the retarder drag torque shall be calculated by:
Tretarder=15istep-up+2istep-up4×nretarder10003
where:
Tretarder Retarder drag loss [Nm]
nretarder Retarder rotor speed [rpm] (see paragraph 5.1 of this Annex)
istep-up Step-up ratio = retarder rotor speed/drive component speed (see paragraph 5.1 of this Annex)

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/VI/appendix/10 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/appendix-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.