Dear Ryan, Table 10 - input is your temporary overvoltage. Normally 2000Vpk for mains voltages up to 250Vac Table 11 - input is your working voltage Table 14 - input is your transient voltage - defined by OVC (for OVC II 2500Vpk). So table 11 brings you very low value and normally table 10 and 15 are dominating.
I hope this helps. Best regards, Boštjan From: Ryan Jazz <[email protected]> Sent: Wednesday, July 26, 2023 12:39 AM To: [email protected] Subject: [PSES] Clearances >30 kHz 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. Dear Members, Hope you can help me understand the requirement for the clearance needed between the bottom PCB of power supply to metal chassis. Looking up UL 62368-1 Third Edition, and using the 'Voltage up to an including peak' of 2000 V for overvoltage category II Table 10 for <30 kHz. I see the clearance is 1,27 mm. Going over to Table 11 >30 kHz this clearance value jumps to 13,2 mm. Am I doing this correctly? Or should I be using the 'working voltage' of the power supply, Primary to Earthed Dead Metal 392 Vpk, Primary to Secondary 520 Vpk. 100-240 Vac, 100 W, 90 kHz switching frequency, AC power supply with a 2x3 inch footprint. End product is, overvoltage category II, pollution degree 2, material group III. Indoor audio music processor, Class 1. All guidance would be appreciated. If this 13,2 mm value is indeed correct, I may need to use an insulator under the power supply. Any recommendations for a UL rated insulator type? Thank you, Ryan Jazz Ryan Jayasinghe Regulatory Compliance Engineer [email protected]<mailto:[email protected]> "After silence, that which best expresses the inexpressible, is music" - Aldous Huxley LINE6 26580 Agoura Road Calabasas CA 91302 818.575.3711 line6.com ampeg.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 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) 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
