Doug, For ITE: 1. You need to ensure complianceo of the PCB/potting combination to the requirements of 2.10.8 "Spacings Filled by Insulation Compound" of IEC60950-1. 2. You need to maintain a min. 0.4 mm distance between the SELV and primary traces and comply with the dielectric strength test for reinforced insulation. 3. You need to maintain the min. V-1 flammability of the board assembly. Remember that min. V-1 flammability board + min. V-1 flammability potting does not ensure a min. V-1 fllammability of the combination board/potting. For other than ITE equipment: Requirements are similar but may be different regardingh the distance through insulation and flammability erquirements. Regards, Peter Regards, Peter
Doug Beckwith <[email protected]> wrote: Hi Everyone, A happy new year to you all. Now for my question. I am looking at a unit that has mains and SELV circuits that is encapsulated (potted). Am I correct in assuming that creepage and clearance distances on the PCB for a potted unit become the same as that for distance through insulation, as when the traces are buried in a multilayer PCB? Regards Doug ______________________________________________________________________ Post your free ad now! http://personals.yahoo.ca This message is from the IEEE Product Safety Engineering SSociety emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Mcantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc _____ Do you Yahoo!? All your favorites on one personal page – Try My Yahoo! <http://my.yahoo.com> ---------------- ----------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Mcantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
