For the surge protection schemes that I am familiar with, there is no protected side or unprotected side. One surge protection device will “protect” both upstream and downstream from the device. One per branch circuit (North America terminology) will “protect” the entire branch, and much of the other branches.
Rich From: mickm [mailto:[email protected]] Sent: Saturday, September 16, 2017 1:40 AM To: [email protected] 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. <https://ci4.googleusercontent.com/proxy/MFofr_tNQCXwgtKy4pOGltrWboeOg0trIAQ09WljehD6kkUvW8SehXbZML9-oMSzaVhU8IEwYspmAGD0dS3oOFpWt2UFmpyfF4ypySLi1XKPXOtDDp7JGfCs0IPXxH2j6mPXQA=s0-d-e1-ft#http://www.ictsp-essays.info/wp-content/uploads/2016/10/ITU-ASSOCIATE-BLUE.png> Regards, Mick Maytum Safety and Telecom Standards <mailto:[email protected]> [email protected] Ictsp-essays.info ------ Original Message ------ From: "John Woodgate" < <mailto:[email protected]> [email protected]> To: <mailto:[email protected]> [email protected] 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/> 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:[email protected]> [email protected]> All emc-pstc postings are archived and searchable on the web at: <http://www.ieee-pses.org/emc-pstc.html> 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/> http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/ Instructions: <http://www.ieee-pses.org/list.html> http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas < <mailto:[email protected]> [email protected]> Mike Cantwell < <mailto:[email protected]> [email protected]> For policy questions, send mail to: Jim Bacher < <mailto:[email protected]> [email protected]> David Heald < <mailto:[email protected]> [email protected]> - ---------------------------------------------------------------- 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 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
