Dear all I am explaining requirement of the standard. If this is OK or not I cannot judge, You can go back to TC108 and complain if this is not OK.
Same rule was also in 60950-1 standard. I can confirm that many many manufacturers of worldwide known PSU manufacturers are regularly use this approach to reduce required distances in inner layers. UL now has also such program for cemented joint testing. Best regards Bostjan Poslano iz Outlook za Android<https://aka.ms/AAb9ysg> ________________________________ From: Ralph McDiarmid <[email protected]> Sent: Wednesday, November 6, 2024 9:50:46 PM To: [email protected] <[email protected]> Subject: Re: [PSES] SV: [PSES] Creepage Live-Ground CAUTION: This email originated from outside of our organisation. Do not click links or open attachments unless you recognise the sender and know the content is safe. I agree with John. A PCB should not be assumed as equivalent to void-free solid insulation. Ralph From: John Woodgate <[email protected]> Sent: November 6, 2024 1:41 PM To: [email protected] Subject: Re: [PSES] SV: [PSES] Creepage Live-Ground I'm not sure. I considered the possibility that in making the PCB, the bonding of the top layer to the ground plane layer might be faulty, creating an air gap between surfaces that are, or might be, conductive. That is why I recommended as much creepage distance as possible. On 2024-11-06 21:27, Richard Nute wrote: Depending on the PCB fabrication, I would expect this construction to be solid insulation from the 230VAC to the ground plane. Such construction has no clearance or creepage. -- OOO - Own Opinions Only Best Wishes John Woodgate Keep trying [https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png]<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free.www.avg.com<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> ________________________________ 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]<mailto:[email protected]> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/<https://www.mail-archive.com/[email protected]/%20> Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe)<https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected]<mailto:[email protected]> Rick Linford at: [email protected]<mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected]<mailto:[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 ________________________________ 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: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe)<https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected]<mailto:[email protected]> Rick Linford at: [email protected]<mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected]<mailto:[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 - ---------------------------------------------------------------- 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: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[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
