Hi Peter:
You are not alone in finding the MOV requirements in Annex G.8 of IEC 62368-1 to be very confusing. There has been a lot of confusion over Annex G.8 In an effort to help clear up some of the confusion, I wrote an article in the October 2018 issue of Incompliance Magazine. The article is titled, “New requirements for MOVs used for surge protection on AC mains ports.” I don’t think attachments are allowed on this listserver, but you can download the article from either my web site or the Incompliance Magazine web site. Following is an excerpt from the article: The MOV requirements in IEC 62368-1 are only a few pages long, but they are difficult for ordinary design engineers to understand. While the two main issues that the MOV requirements are trying to address are electric shock and risk of fire, it is not always clear which of these two hazards a given requirement is trying to address. A key goal of this article is to help readers of IEC 62368-1 understand the underlying safety concerns that the new requirements are trying to address. This understanding can be quite helpful when attempting to interpret the stated requirements. In particular, knowing the underlying concerns is helpful for understanding the various exemptions and alternate solutions that are permitted. The bottom line is that MOVs can still be used on AC mains ports (even in plastic enclosures), but some additional safeguards are now required. The additional safeguards are not particularly difficult of expensive to provide. If you still have questions after reading the article, feel free to contact me. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) <mailto:[email protected]> [email protected] <http://www.randolph-telecom.com> http://www.randolph-telecom.com From: [email protected] [mailto:[email protected]] Sent: Tuesday, June 20, 2023 5:32 PM To: [email protected] Subject: [PSES] IEC 82368-1 3rd Ed and MOV test Hello group, Does anyone know what the is purpose of introducing Clause G8? What purpose does it serves and why was it introduced? It seems to me that is almost impossible to comply with this clause unless you remove the MOV which brings EMI issues. I am working with a client who makes desktop adapter with plastic enclosure and they have not been able to come up with a solution yet. Any pointer? Thank you Peter - ---------------------------------------------------------------- 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: 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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[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]> 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
