I had a similar customer complaint when working for HP in the late 1980’s – on that occasion it was from the pins of the IEC 620 (now 60620) power connector of a rather large & heavy’ish (c 18kg!) unit - which the user then dropped on his foot!
I did some investigation and discussed the matter with my colleagues at the supplying division, and concluded that the product did actually meet the current requirements of the relevant product standard (IEC 380) – can’t remember just what happened after that, apart from making a strong recommendation to that division and HP Coporate to redesign products to reduce/eliminate the shock issue because it was definitely not “customer-friendly”, even if relevant product standards were met! John E Allen W. London, UK From: Bill Owsley <000000f5a03f18eb-dmarc-requ...@listserv.ieee.org> Sent: 29 October 2022 20:21 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Measurement of X and Y capacitors for electric shock A personal history, as intern/coop student, circa 1980-81, I was tasked with trying to capture the cap voltage just after disconnect. Because a consumer complained about getting shocked. Engineers general thoughts were it decays fast enough to not be a problem, and that ought teach the consumer to not touch the plug pins. Well I got the job of providing evidence. So setup scopes and a stock of polaroid film (only way for screen captures), after some time plugging and unplugging subject equipment, the high voltage and decay time were recorded. Consumer indeed could get shocked. Internal corp redesigned all pluggable power supplies to decay at an arbitrary rate influenced by safety opinions. And data went to committees for additional debates. And here we are !!! Sent from Yahoo Mail on Android <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> On Mon, Oct 17, 2022 at 18:01, Richard Nute <ri...@ieee.org <mailto:ri...@ieee.org> > wrote: See attached for a comprehensive discussion of X and Y capacitor discharge measurement techniques. In some standards, the use of a 100-megohm probe is accepted without correction for its resistance. Best regards, Rich IEEE Life Fellow IEEE Medal for Environmental and Safety Technologies - ---------------------------------------------------------------- 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 Website: 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 For help, send mail to the list administrators: 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> > _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- 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 Website: 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 For help, send mail to the list administrators: 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> > _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- 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 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: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
