Hi Brian, An open-circuit of 15kV pk and short-circuit peak of 7500A, tells me an internal impedance of 2 ohms. If I recall correctly, 61000-4-5 specifies source impedance, depending on L-L or L-G coupling (2 ohms or 12 ohms)
Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric From: Brian Ceresney [mailto:bceres...@delta-q.com] Sent: Tuesday, August 22, 2017 1:29 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Surge Suppression - Dos, and Don'ts Hello All, We have a base design that passed testing (exhibiting no damage) using a 1.2u/50uS open-circuit of 15kV, and an 8/20uS current peak of 7.5kA, as per IEC61000-4-5. (This product did not include the extra design features that I proposed earlier, only basic surge suppression, and a fuse rated for higher energy). I believe that the internal surge impedance is specified for this test equipment, but I don't know it offhand. Testing used 5 positive and 5 negative pulses for each of Line-Ground, Line -Neutral, and Neutral- Ground. My impression was that in case of a short-circuited or leaky surge suppression device, the primary fusing might not be of a value that would not open soon enough to prevent possible shock hazard from leakage. Therefore a secondary series fuse, or series spark gap device would be required to stop this condition. Best Regards, Brian C. ________________________________________ Brian Ceresney Regulatory Lead Delta-Q Technologies Corp. 3755 Willingdon Avenue, Burnaby, B.C. Canada. V5G 3H3 Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: August-22-17 10:06 AM To: Brian Ceresney <mailto:bceres...@delta-q.com>; mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Surge Suppression - Dos, and Don'ts >From what impedance? I know that these are successive questions, but without >information about the source, nothing can be reliably designed. Standards in >the IEC 62561 series might help with information. sage is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <mailto:emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <mailto:sdoug...@ieee.org> Mike Cantwell <mailto:mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <mailto:j.bac...@ieee.org> David Heald <mailto:dhe...@gmail.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 <mailto:emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <mailto:sdoug...@ieee.org> Mike Cantwell <mailto:mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <mailto:j.bac...@ieee.org> David Heald <mailto:dhe...@gmail.com> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ - ---------------------------------------------------------------- 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 <mailto:emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <mailto:sdoug...@ieee.org> Mike Cantwell <mailto:mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <mailto:j.bac...@ieee.org> David Heald <mailto:dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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