Hi Matthew Although I’ve not checked that they all correlate, I believe that the efficiency calculations originate from the International Efficiency Marking Protocol for External Power Supplies: https://beta.regulations.gov/document/EERE-2008-BT-STD-0005-0218 <https://beta.regulations.gov/document/EERE-2008-BT-STD-0005-0218>
How they were originally decided upon though I don’t know. Best Regards Chris Wordley Senior Consultant email: chris.word...@conformance.co.uk Direct Line: 01298 873817 Mobile: 07856 520321 Join us for CE marking training - Click here to see our scheduled courses for 2021 <https://www.conformance.co.uk/our-services/ce-marking-training-risk-assessment> Conformance Limited. The Old Methodist Chapel, Great Hucklow, Buxton, SK17 8RG England Tel. +44 1298 873800, Fax. +44 1298 873801, www.conformance.co.uk <http://www.conformance.co.uk/> Registered in England, Company No. 3478646 > On 21 Jan 2021, at 15:08, Matthew Wilson | GBE > <matthew.wil...@gbelectronics.com> wrote: > > EU 2019/1782 is the ecodesign requirements for external power supplies, i.e. > their efficiency, for Directive 2009/125/EC. Someone asked me how the formula > in 1(b) of Annex II of the EU 2019/1782 regulation was decided upon. This > table sets out the determination of 'average active efficiency'. I don't know > the answer to where all that came from. So I thought posting here might bring > some enlightenment? > > The regulation in all its glory is here: > https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv%3AOJ.L_.2019.272.01.0095.01.ENG&toc=OJ%3AL%3A2019%3A272%3ATOC > > Thanks & kind regards, > > > <image850622.png> > Disclaimer: This email and any files transmitted with it are confidential > and intended solely for the use of the individual or entity to whom they are > addressed. If you have received this email in error please delete it from > your system, do not use or disclose the information in any way and notify the > sender immediately. The contents of this message may contain personal views > which are not the views of the company, unless specifically stated. > GB Electronics (UK) Ltd is a company registered in England and Wales under > number 06210991. > Registered office: Ascot House Mulberry Close, Woods Way, Goring By Sea, > West Sussex, BN12 4QY. > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <emc-p...@ieee.org <mailto:emc-p...@ieee.org>> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <http://www.ieee-pses.org/emc-pstc.html> > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ > <http://product-compliance.oc.ieee.org/> can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ <http://www.ieee-pses.org/> > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > <http://www.ieee-pses.org/listrules.html> > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>> > David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com>> > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
