Hi Scott:
A 1st degree skin burn occurs when skin temperature is 44 C. Plastic material has relatively high thermal resistance. 80 C plastic is unlikely to cause a burn regardless of contact time. In a separate message, I will send separately my paper on thermal injury from the 2014 ISPCE. From this you can calculate whether or not a burn will occur. Stay safe, and best regards, Rich Ps: A charger running at more than 80 C is poorly designed. From: Scott Xe <scott...@gmail.com> Sent: Thursday, September 2, 2021 6:02 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Touch temperature limits for accessible parts I am looking for advice on temp measurements and the requirements. I have an in-car charger with a temp of 80 degC on external plastic enclosure at max load. Referring to EN 62368-1, the max temp is from 48 - 94 degC depending on the time to be touched to operate the equipment. During operation, it is unnecessary to touch the external enclosure except plugging in and taking out from cigarette socket. Is it deemed to apply 94 degC? Should the max temp be measured at room temp of 25 degC or the maximum operating temp? If at max operating temp, how to derive the max temp limits in such conditions? Thanks and regards, Scott - ---------------------------------------------------------------- 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>
