Dear Bernd, Well, thanks for your advice and reference! I will get the standard for study.
Best regards, Scott Sent from Mail for Windows 10 From: Dürrer Bernd Sent: Wednesday, 28 November 2018 06:11 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] AW: [PSES] Glow wire tests Hello Scott, the glow-wire test method standard IEC 60695-2-11 contains an informative Annex A with a table that defines test temperatures for different kinds of application. 550°C is the minimum test temperature to demonstrate resistance to heat and fire. Higher temperatures apply, depending on the type of application (attended or unattended operation), typical load and direct contact to current-carrying parts. Kind regards, Bernd Von: Ted Eckert <000007cf6ebeab9d-dmarc-requ...@ieee.org> Gesendet: Dienstag, 27. November 2018 21:56 An: EMC-PSTC@LISTSERV.IEEE.ORG Betreff: Re: [PSES] Glow wire tests Hello Scott, I don’t know the exact basis for the determination of which test is run. I know the basics of the glow wire standard, but not the details. Regards, Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. From: Scott Xe <scott...@gmail.com> Sent: Tuesday, November 27, 2018 12:40 AM To: Ted Eckert <ted.eck...@microsoft.com> Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Glow wire tests Dear Ted, Thanks for your useful guidance! What is the definition of medium and higher energies? I notice the safety standard determines the test voltage using the spacing between electrical conductors and plastic. Is there any relationship in between? Regards, Scott On Thu, 22 Nov 2018 at 02:01, Ted Eckert <ted.eck...@microsoft.com> wrote: Hello Scott, There are two different approaches to testing materials for flammability ratings. UL 94 determines what happens when plastics are ignited. It determines how material burn and whether they self- extinguish. These tests are based on the assumption that the material will ignite and then see how the material burns. The tests look at the rate of flame spread, dripping particles and other factors. The glow wire test takes a different approach. It determines how easy or hard it is to ignite a material in the first place. A material may burn easily, but if it’s extremely hard to ignite, the rate at which it burns might not be an issue. Magnesium is used as a light-weight material for IT products, engine blocks and high-performance automobile wheels. Once it is ignited, it burns rapidly and releases a lot of energy. However, it’s very hard to ignite solid metallic magnesium in the first place. In summary, some standards are concerned with whether or not a material ignites easily and then don’t test how well they burn after they are ignited. Materials that don’t ignite easily are accepted. Other standards only test how materials burn. If materials don’t burn quickly and resist flame spread, the standard doesn’t test how easily they ignite. They address the same problem through different approaches. The different temperatures for glow wire tests represent different ignition sources. One is a medium energy source and the other a higher energy source. Materials that resist the higher temperature are considered harder to ignite. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. From: Scott Xe <scott...@gmail.com> Sent: Wednesday, November 21, 2018 8:54 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Glow wire tests I notice in safety test standards that the plastic enclosure is required to pass glow wire test. What does this test for? There are commonly two conditions: 550 or 750 degC. What are the differences and what does each represent its capabilities? I am new to this requirement and appreciate your decent explanation. Thanks and regards, Scott - ---------------------------------------------------------------- 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> WILO SE Nortkirchenstrasse 100, 44263 Dortmund Amtsgericht Dortmund, HRB 21356 www.wilo.com Vorstand/Executive Board: Oliver Hermes (Vorsitzender/Chairman), Georg Weber, Mathias Weyers Aufsichtsratsvorsitzender/Chairman of the Supervisory Board: Prof. Dr. Norbert Wieselhuber Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe sowie Vervielfaeltigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdruecklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere fuer den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our expressed permission. All rights reserved, especially the right to apply for protective rights. Datenschutz ist uns wichtig! Daher gehen wir sorgsam mit Ihren Daten um. Näheres finden Sie in unseren Datenschutzhinweisen. Sollten Sie keinen Kontakt mehr mit uns wünschen, wenden Sie sich bitte an datensch...@wilo.com. Data Protection is important to us! Therefore we handle your data carefully. Please find the details in our Note on Data Protection. If you do not wish to stay in touch with us anymore, please write to data-priv...@wilo.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>
