The point surely is that if the surge protection fails, and that is not detected and repaired, the next storm may destroy the equipment. As I said, I don't think this is a standards matter, it's a design matter. It is absolutely essential to distinguish between designing to meet a standard and designing a reliable product. With best wishes John Woodgate 3 Bramfield Road East, RAYLEIGH Essex SS6 8RG UK OOO - Own Opinions Only <http://www.jmwa.demon.co.uk/> www.jmwa.demon.co.uk J M Woodgate and Associates Beware averages! They hide or discard data, and may distort it (them?). From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] Sent: 22 August 2017 18:03 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Surge Suppression - Dos, and Don'ts I've not had any NRTL be concerned with protection of the surge protector. The surge protector is typically protecting against product failure not fire or operator injury. The NRTL is not concerned with surge protector failure as long as it doesn't result in a hazardous condition. If the manufacturer of the surge protector has specific conditions of use including protection then the NRTL would expect those to be followed. Of course they want to see that the surge protector itself is NRTL approved. The surge protectors typically need to be removed for production line dielectric test, this is understood by the NRTL. -Dave From: Brian Ceresney [mailto:bceres...@delta-q.com] Sent: Tuesday, August 22, 2017 12:31 PM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Surge Suppression - Dos, and Don'ts Dear Regulatory Experts, We have recently had a request from a customer to modify an industrial battery charger(48V, 1000W output) to meet extremely high surge limits, ostensibly to help survive lightning strikes. In designing this version of the product, we have added varistor surge protection from Line-Ground, Line-Line, and Neutral-Ground positions. This product is intended for use in North America, and Europe, and will be third-party-approved for both. I recall from previous discussions on this forum that there are specific requirements for accepting this type of design, due to the inevitable failure of the surge protection devices. I believe that fuse protection in line with each surge device is required, as well as some sort of indication to warn the user when the surge protection circuitry is damaged. Series connected spark -gap devices were mentioned, and there was also some discussion about the rationale behind dielectric strength testing, and how to perform it, especially on the production line. I've searched the archives, but not found anything definitive that is recent. In addition, even though Google is my friend, I have not managed to find a standard that can offer me up to date guidance on this issue. Can anyone suggest standards, bulletins, or any other document that can light my way? Thanks, in advance, Best Regards, Brian (the third Brian, I think) _____
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. - ---------------------------------------------------------------- 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 <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 (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: Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <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 <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 (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: Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <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>
