In message <d7b00ba5b5a75d44abb5117414b1341b0465d...@eld-exch1.europe.echostar.com>, dated Tue, 22 Sep 2009, "Wordley, Chris" <[email protected]> writes:
>4) As I read it, if the output rating of the EPS is <6V AND >550mA it >is classed as a "Low Voltage" EPS, in which case 1275/2008 does NOT >apply to the EPS/product combination (see article 8 of 278/2009) Yes, but why not? If it is an old-type supply with a mains transformer, and the output is AC (the Regulation doesn't specify AC or DC for this exemption), then the *same design* of transformer could supply either 5 V at 1 A or 25 V at 0.2 A. No-load power and active efficiency would be the same, so why is the 5 V supply exempt? The no-load power and efficiency of a mains transformer can be brought within the requirements by careful choice of core size and grade of iron. The resulting price may or may not be acceptable. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
