In message <[email protected]>, dated Fri, 17 Feb 2006, John Woodgate <[email protected]> writes >In message <p06230922c01bf4685e3d@[192.168.1.83]>, dated Fri, 17 Feb >2006, Nick Williams <[email protected]> writes >>Noted your later posting, and I will admit to sticking my nose into >>something I am not properly briefed on, but your comment: >> >>At 9:23 pm +0000 17/2/06, John Woodgate wrote: >>> >>>Episode 3 is that the section of Part 2 applicable to switch-mode >>>power supply transformers is section 2-16, which has not yet been >>>published. >> >>sparked my interest. >> >>I have, on my desk and in front of me now (yes, I am still at work!), >>a copy of BS EN 61558-2-17:1998 "Safety of power transformers, power >>supply units and similar. Particular requirements for transformers for >>switch mode power supplies". >> >>This appears to be somewhat at odds with your Episode 3, and may be >>useful for your further consideration. > >Well, now, someone had better ask TC96 what they are up to, because >section 16 is: > >Safety of power transformers, power supplies, reactors, and similar >products - Part 2-16: Particular requirements for switch mode power >supplies and transformers for switch mode power supplies > >How confusing can you get?
The plot thickens still further. IEC 61558-2-17 does not have ANY exclusions in its scope, so applies to ALL SMPS transformers. BUT it's nine years old, and the IEC web site doesn't show any work in progress to revise it, to bring it into line with the second edition of IEC 61558-1. Another document, not in the public domain, dated July 2005, says this about a joint project of TC96, TC108 and TC55: Action: We are now waiting for the results of the work in TC 55/WG DKE AK 413.0.1 and 413.0.2. The aim is that we can replace Annex U of IEC 60950 and Annex K of IEC 61558-1. Maybe there is someone involved in IEC TC96 who can throw more light on the relationship of IEC 61558-2-16 and -2-17, whose scopes seem to overlap. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immoderately. John Woodgate - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
