In message <001d01c6bb31$d73bf420$0200a8c8@BEMCSRLAP>, dated Tue, 8 Aug 2006, Steve Thomas - T1 Technology <[email protected]> writes >We are currently designing an appliance for the gaming industry and >looking for a suitable PSU. It appears that a lot of PSU?s are >assessed against EN 60950 especially those for the PC industry. We >have a couple of such PSU?s in mind with ?SELV? outputs but under EN >60335 there is a requirement that Safety extra-low voltage circuits >shall not be earthed unless they are ?protective extra-low voltage >circuits?.
Protected, I think. > Now most PC PSU?s I have used in the past have the DC output ground >tied to protective earth. IEC/EN 60950-1 uses a different definition of SELV. > > > >Does this mean that we cannot classify the outputs as SELV within the >final product (if DC ground is earthed)? If so then do they become >?Live? parts even though they are double insulated from mains? You should ask the power supply manufacturer if they meet the requirements for PELV under IEC/EN 60335-1. (You may have to tell them what those requirements are.) They probably DO meet the requirements. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
