The saga continues. To discover a point of reference, I turned to the plug-in power supply used by my customer with the current version of their product. This power supply bears certification marks from two NRTLs (one N.A. lab's medical and dental equipment power supply component mark and one German lab's full-on NRTL/SCC mark) and another marking from the same German lab that includes the text:
"EN60601-1 "IEC60601-1" The label also includes the text, "power supply for medical use." (As an aside, the German lab's web site also shows other certifications against IEC/EN60950-1 for this manufacturer/model power supply. The dates on all of the indicated safety certifications from the German lab predate IEC60601-1, 3rd ed) I cracked open this power supply and also found a Y1 capacitor bridging primary and secondary, with a routed out area in the supporting board, under the capacitor and optical isolator. Hmmmmm. An EST showed this power supply could withstand 4kV for about 100s, whereupon dielectric breakdown visibly occurred (of all places) across traces in the primary side of the board (probably a cascade effect). Regards, Peter L. Tarver, PE [email protected] CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. _____________________________________________________________________________ Scanned by Sanmina-SCI eShield _______ _____________________________________________________________________ - 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 ______________________________________________________________________
