I have a client who has a secondary pwb that has traces and vias that may have 100 vdc on them adjacent to ground.
Per 61010-1 there is a requirement for spacing and/or dielectric test, both depending on what the mains voltage is. The question is why is the mains voltage a consideration or concern if the 100vdc secondary voltage is several layers of impedance and circuitry from the mains? Is it a concern that a surge on the mains would trickle down to the secondary circuit, or is there another reason/rationale? I suggested that a dielectric test per Table 6 [in A1] would suffice and put the issue to rest for this product, but the question from the designers remains as to why is it a concern in the standard of what the mains voltage is. Is there anything in the standard, that I haven't found, that does not require Table 6 to be followed if there is no way for a mains surge to impact the secondary voltage? I look to the experts for an explanation. Thanks, Steve Brody [email protected] mailto:[email protected] C - 603 617 9116 - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html 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: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
