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Eric, You need to distinguish between where Basic Insulation is required (e.g. between a TNV-2 Circuit part and an SELV Circuit part that is not protectively earthed) and Functional/Basic Insulation (e.g. between the +ve and -ve supply rails). Basic Insulation is used to provide protection from electric shock, so there is no reduction in spacing requirements based on the flammability characteristics of the pcb. On the other hand, it is permissible to use reduced spacings for Functional Insulation providing that a short does not result in a hazard (examples being overheating or a fire). I know that IEC 60950-1 is a very large standard and so it can be daunting. However, there are far more devils than the one you mentioned in the minutia of its details: just a cautionary remark from someone who’s been involved with designing products to this standard and its predecessors for many years. Regards, Richard Hughes This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: 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: Ron Pickard: [email protected] Dave Heald: [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
