Yes, agree, John. The pcb design is +35 years old and product is soon end of life. No resources for changing the board.
But, yes, it should have had a lot more space. I guess it was a requirement in 1990 as well BR Amund Fra: John Woodgate Sendt: 5. november 2024 17:47 Til: Amund Westin <[email protected]> Emne: Re: [PSES] SV: [PSES] Creepage Live-Ground A prudent design would give as much distance as possible. If the layer bonding was faulty, one or both surfaces could be dirty and potentially conductive. On 2024-11-05 16:38, Amund Westin wrote: Thanks Boštjan PCB temp is below 90C. So, it means no actual creepage distance requirement, but high-voltage test (1500V) must be done? BR Amund Fra: Boštjan Glavič Sendt: 5. november 2024 17:26 Til: 'Amund Westin' <mailto:[email protected]> <[email protected]>; [email protected] <mailto:[email protected]> Emne: RE: [PSES] Creepage Live-Ground Dear Amund, Depends on many factors. 1. If PCB temperature is less than 90degC then only dti applies, without the need for cemented joint test. Since you are talking about basic insulation, there is no minimum dti for basic, just hipot test. 2. If temperature of PCB is above 90degC, then either 1. You perform thermal cycling test to reduce inner pollution degree to PD1, then minimum creepage is same as minimum clearance (table 10 with input of TOV and table 14 with input of transient level). 2. You perform cemented joint test and apply same as under 1) 3. You comply with the same requirements as for top/bottom distances (table 10 with input of TOV and table 14 with input of transient level). If you have OVC II and PD2 and TOV of 2000V, minimum required creepage (without reduction for inner layers) is 2,3mm coming from table 17 I hope this helps. Best regards, Boštjan From: Amund Westin <[email protected] <mailto:[email protected]> > Sent: Tuesday, November 5, 2024 2:51 PM To: [email protected] <mailto:[email protected]> Subject: [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. Pin with 230VAC through the FR4 PCB with spacing to the inner ground plane. Creepage: Which table in the EN 62368-1:2020 apply? BR Amund _____ 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/ <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 <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &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] <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/ <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 <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 -- OOO - Own Opinions Only Best Wishes John Woodgate Keep trying <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> www.avg.com - ---------------------------------------------------------------- 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
