Dear Rich, 44 degC causing 1st degree skin burn is new to me and easy to get in touch with this temperature in daily life. I am looking forward to receiving your paper and learning this matter in greater depth!
Many thanks & kindest regards, Scott On Fri, 3 Sept 2021 at 00:44, Richard Nute <ri...@ieee.org> wrote: > > > 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>
