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Thank you From: Richard Nute <ri...@bendbroadband.com> Sent: Friday, April 26, 2024 6:54 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Couple of loosely related safety questions [EXTERNAL EMAIL] DO NOT CLICK links or attachments unless you recognize the sender and know the content is safe. Hi Brian: You should attend the IEEE PSES Symposium in Chicago next week to get the answers to these questions from experts. Lots of experts in clearance and creepage will be there and will be happy to provide you with answers! Best regards, Rich From: Brian Gregory [mailto:brian_greg...@netzero.net] Sent: Friday, April 26, 2024 4:12 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Couple of loosely related safety questions 1. Clearances for US Safety: I'd cite the relevant standards, but they are so alike (identical Clearance tables), and so alike to UL 508, I'll defer. Here's the question: When citing clearance spacing from "uninsulated live components" does one measure from the edge of a PCB to the enclosure well, or only from the live components, like a pad, or the bottom pin of a thru-hole cap? 1a. what sort of passivation or RTV could make those live components not "uninsulated"? 2. Slots to increase creepage for high-voltage components A FET that's rated for say 600V does not have to follow PCB-creepage rules for 600V, is clearly stated places like UL 1741, §26.1.1 exception #8. For other components, like say 1000V caps in 0805 packages or FET driver chips the requirements aren't as clear. Is a slot needed to maintain creepage or not if the component is properly rated? It does appear from a TI support page for dual-bridge converters, that slots are recommended in order to prevent contamination that may compromise the components isolation performance. My gut says: no, slots are not needed between component terminals on a PCB, but could be recommended for sensitive parts, like FET drivers. Thoughts? Colorado Brian ________________________________ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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