Hi, Vincent. As Bernd pointed out, IEC 60664 gives the best information on the scientific basis for Clearance and Creepage distances.
Paschen’s Law will (theoretically) have no effect on Creepages. Theoretically, Creepages exists in two dimensions. Realistically, even the thinnest copper on a board has some height, so it’s possible that, under the right circumstances, Paschen’s could have an effect on Creepages as well as Clearances. Peter Tarver From: Vincent Lee Sent: Tuesday, May 09, 2017 21:00 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 ? The information contained in this message may be privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete or destroy any copy of this message! - ---------------------------------------------------------------- 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>
