Hello Brad, I recommend getting a copy of IEC TR 62368-2. It is the rationale document for IEC 62368-1 and it will provide history, rationale and additional information on this and other requirements of the standard. The short answer is that the 15 W limit has been used as a limit in other IEC standards. The 3 second time was selected for ease of measurement. Times as short as 100 ms and as long a 5 seconds were considered.
Best regards, Ted Eckert Microsoft The opinions expressed are my own and do not necessarily reflect those of my employer. From: Willard, Bradley <bradley.will...@zebra.com> Sent: Thursday, July 26, 2018 2:29 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] PS1 limit? Hello Everyone, I'm looking for guidance on how the PS1 limit of 15 watts for 3 seconds in IEC 62368-1 was determined. Thanks in advance! Best regards, Brad ________________________________ - CONFIDENTIAL- This email and any files transmitted with it are confidential, and may also be legally privileged. If you are not the intended recipient, you may not review, use, copy, or distribute this message. If you receive this email in error, please notify the sender immediately by reply email and then delete this email. - ---------------------------------------------------------------- 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<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ieee-pses.org%2Femc-pstc.html&data=02%7C01%7Cted.eckert%40microsoft.com%7Ca98c34eac61d467a3a1f08d5f33ee643%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636682373838990623&sdata=3Jz8Cr%2B8%2FcLlIGa3RSyLN3wD14VuEtBXa%2Fyx%2FqoiP74%3D&reserved=0> Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fproduct-compliance.oc.ieee.org%2F&data=02%7C01%7Cted.eckert%40microsoft.com%7Ca98c34eac61d467a3a1f08d5f33ee643%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636682373839000632&sdata=AQtON%2FDjo1GtEnyeIZDwI8yM018Moc0nl4wtkLVMby0%3D&reserved=0> can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ieee-pses.org%2F&data=02%7C01%7Cted.eckert%40microsoft.com%7Ca98c34eac61d467a3a1f08d5f33ee643%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636682373839000632&sdata=VDt4SouzU%2Fo8Z8ELdTvEDvvwDWedKLhKBUORPkNpbeo%3D&reserved=0> Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ieee-pses.org%2Flist.html&data=02%7C01%7Cted.eckert%40microsoft.com%7Ca98c34eac61d467a3a1f08d5f33ee643%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636682373839010642&sdata=x41qIfncQBiLzimCMkIVsnNkKaShN0mihXJg62t%2F5Dk%3D&reserved=0> List rules: http://www.ieee-pses.org/listrules.html<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ieee-pses.org%2Flistrules.html&data=02%7C01%7Cted.eckert%40microsoft.com%7Ca98c34eac61d467a3a1f08d5f33ee643%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636682373839010642&sdata=ZkdLxex8vgrOZzLXA%2Fj%2FJ%2BA3wTCq3JgK7Y4ekzS6Lzo%3D&reserved=0> For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> 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>> - ---------------------------------------------------------------- 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 Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
