Hi Ralph: Thanks for the reference. My comments are validated by ANSI C62.41.1 .
Best regards, Rich -----Original Message----- From: Ralph McDiarmid [mailto:ralph.mcdiar...@schneider-electric.com] Sent: Monday, September 18, 2017 9:01 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] power strip details Pardon me, the correct reference is ANSI C62.41.1 (finger trouble on keyboard) Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric -----Original Message----- From: Ralph McDiarmid Sent: Monday, September 18, 2017 8:55 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] power strip details While I agree that an SPD at the service entrance seems to be the way to suppress surges resulting from direct/near/far lightning strokes, ANSI C62.4.1 writes about switching transients on circuits which cause oscillatory surges on the mains. SPD at service entrance might be less effective for those. The ANSI standard seems a very good summary of what is a complex topic. Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric From: Richard Nute [mailto:ri...@ieee.org] Sent: Saturday, September 16, 2017 12:30 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] power strip details I believe the principal culprit is the extreme magnetic field that surrounds the conductors when the surge protector operates rather than the current in the PE conductor. This field can generate high voltages in adjacent and nearby low-voltage conductors such as telephone and data cables. Think air-core transformer. If the surge protector is at the service entrance, then the high current is in the electricity supplier wires, and the coupling to telephone, cable, and data cables is reduced due to the distance between the wires. http://www.nemasurge.org/faqs/ Rich From: mickm [mailto:mjmay...@gmail.com] Sent: Saturday, September 16, 2017 1:40 AM To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] power strip details John, It seems to me that TC 108 documents really devise surge protection component tests rather that complete equipment tests and so miss some hidden field gotchas. I with Richards point about surge protection, for me the concern is the surge current being diverted into the PE system creating local PE surge differential voltage rises. Multi-service surge protective devices (MSPDs) - all in one surge protection (mitigation actually) - can cause problems here by transferring a surge on one service, say AC mains, to another service e.g. telephone service, because that service feed offers a better path for the diverted surge current than the PE connection. Equipment connected to the protected output of the MSPD should survive the surge, but equipment connected on the unprotected side may suffer due to the unexpected diverted surge. Solution, put and MSPD on every bit of equipment. Looks like a win-win situation for MSPD manufacturers. Regards, Mick Maytum Safety and Telecom Standards mailto:mjmay...@gmail.com Ictsp-essays.info ------ Original Message ------ From: "John Woodgate" <mailto:jmw1...@btinternet.com> To: mailto:EMC-PSTC@listserv.ieee.org Sent: 16/09/2017 08:04:59 Subject: Re: [PSES] power strip details I agree, but doesn't that also apply to surge-suppression built into equipment? Should we stop requiring surge immunity testing on equipment? With best wishes DESIGN IT IN! OOO – Own Opinions Only http://www.jmwa.demon.co.uk/ J M Woodgate and Associates Rayleigh England UK is a sovereignty, not a Zollverein-ty - ---------------------------------------------------------------- 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. To post a message to the list, send your e-mail to <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 (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <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 <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 (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
