Dear Vincent, I do not know IEC 60601-1, but as it references IEC 60664-1, I assume the same principles of insulation coordination are applied. In fact there is a book on that topic by Klaus Stimper "The Physical Fundamentals of Low-Voltage Insulation Co-Ordination", but the English version seems to be out of print, and only the German original can be ordered from VDE Verlag (https://www.vde-verlag.de/books/403447/isolationskoordination-in-niederspannungsanlagen.html). There is also an application guide IEC TR 60664-2-1:2011 (https://webstore.iec.ch/publication/2797) that might be helpful.
You are right that the definition of air clearances refers to Paschen's Law, while the definition of creepage distances is based on a statistical evaluation of long-term measurement results (e.g. impulse withstand voltage, insulation resistance) for different insulation materials after endurance and field testing under varying environmental conditions (e.g. temperature, humidity, pollution). Kind regards, Bernd Von: Vincent Lee [mailto:000008e6c8d35910-dmarc-requ...@ieee.org] Gesendet: Mittwoch, 10. Mai 2017 06:00 An: EMC-PSTC@LISTSERV.IEEE.ORG Betreff: [PSES] Scientific principles behind Surface Creepage & Air Clearance Hi all, Good day, 1) May I know what is the scientific relationship between Paschen's Law (https://en.wikipedia.org/wiki/Paschen%27s_law) and surface creepage and air clearance distance ? 2) If there is a relationship, how can one calculate the surface creepage and air clearance distance (such as those in IEC 60601-1 3rd) based on Paschen's Law ? 3) If Paschen's Law is not applicable for such calculation, then how are the surface creepage and air clearance distance (such as those in IEC 60601-1 3rd) obtained ? On what scientific basis or principles ? Hope to hear from you soon. Thank you & have a nice day. Regards, Vincent - ---------------------------------------------------------------- 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 <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 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 List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <mailto:sdoug...@ieee.org> Mike Cantwell <mailto:mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <mailto:j.bac...@ieee.org> David Heald <mailto:dhe...@gmail.com> ________________________________ WILO SE Nortkirchenstrasse 100, 44263 Dortmund Amtsgericht Dortmund, HRB 21356 www.wilo.com Vorstand/Executive Board: Oliver Hermes (Vorsitzender/Chairman), Dr. Markus Beukenberg, Carsten Krumm, Eric Lachambre, Mathias Weyers Aufsichtsratsvorsitzender/Chairman of the Supervisory Board: Prof. Dr. Norbert Wieselhuber Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe sowie Vervielfaeltigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdruecklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere fuer den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our expressed permission. All rights reserved, especially the right to apply for protective rights. - ---------------------------------------------------------------- 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>
