Hi John, Thanks, I have a copy of the relevant standard.
But in 7.2 is also mentioned that for such products the test shall be done in a similar way as for grounded products but without adding any additional external grounded connections. And that is physically correct as I think. Also without PE connection of the product itself the common mode surge tests with 2kV will stress the L to N input of the product with more than the 1kV of the differential test. And exactly this happened and damaged the power supply. Regards Helmut -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von John Woodgate Gesendet: Freitag, 8. März 2013 15:10 An: [email protected] Betreff: Re: Surge Test Power Supply Class 2 acc. EN61000-4-5 In message <2AA1EFC0E932461392280BAFDD591F1D@lashko>, dated Fri, 8 Mar 2013, =?iso-8859-1?Q?H. K=F6ster?= <[email protected]> writes: >Please give me your experts comments. 7.2 of IEC/EN 61000-4-5 says (among other things): If there are no other possible connections to earth, line-to-ground tests may be omitted. It is really wise to have copies of the standards that are involved in the work, especially now that low-cost sources of ENs are now available. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- 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://listserv.ieee.org/request/user-guide.html 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]> - ---------------------------------------------------------------- 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://listserv.ieee.org/request/user-guide.html 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]>
