Well folks. I disagree. Here's why. If the power supply is used in an application were the output is referenced to ground , you will not be stressing the primary to secondary circuits. If your power supply isn't man enough for this you should place warnings in your literature BEFORE purchase is made.
MHO Derek Sent from my iPhone On Mar 8, 2013, at 9:00 AM, "Anthony Thomson" <[email protected]> wrote: > > > Table 4 of EN 55024 is clear enough, 1kV line-line and 2kV line-ground tested > i.a.w. IEC 61000-4-5. > > > > Clause 7.2 of 61000-4-5 says that, for double insulated products without an > earth, line-ground tests may be omitted. > > > > I would agree with your power supply manufacturer assuming the PSU is of > double insulated construction. 1 kV is sufficient to claim compliance to > '55024. > > > T > >> ----- Original Message ----- >> From: H.Köster >> Sent: 03/08/13 01:50 PM >> To: [email protected] >> Subject: [PSES] Surge Test Power Supply Class 2 acc. EN61000-4-5 >> >> Hello group, >> >> I have a question about the surge test for a 27VA ac adapter (without PE and >> external earth connections) for IT equipment. >> >> EN55024 refers to EN61000-4-5 requiring a test level of 1kV between L and N >> and 2kV between L and PE as well as between N and PE. >> >> The power supply failed the common mode tests of 2kV with damages. The power >> supply manufacturer argues that the power supply has no PE connection and >> therefore these common mode tests are not required. >> >> Please give me your experts comments. >> >> Thanks >> >> Helmut Koester >> >> PSi Engineering GmbH >> mailto:[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]> > > - > ---------------------------------------------------------------- > 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]>
