In Europe the most home networks consist of Line (L1,L2 or L3) and N(eutral) + PE. Most of the power systems have their N lines connected to
PE (protective earth) at the entry of the home.(TT and IT power systems) EN 60950 has a few examples of power supply configurations (look for ANNEX V) I do not think it has something to do with EMC. EMI (is supposed conducted EMI) differences may have to do with a non compliant setup of the measurement or simply a change in setup lay-out. At the measurement side of a LISN both lines are floating (isolated) from ground for the frequencies involved. There are a few issues with PE lines and their termination in LISN's, but they seem not related to your issue. Regards, Ing. Gert Gremmen, BSc [email protected] <mailto:[email protected]> www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: Pat Lawler [mailto:[email protected]] Verzonden: Wednesday, October 23, 2013 3:57 PM Aan: [email protected] Onderwerp: [PSES] AC input test voltages - requirement for grounded phase? All, Do the EMC test standards require one of the AC input phases ('neutral' in the U.S.) be grounded? If so, where can I find an example of this requirement? In the past, I had an experience where EMI test results with an AC supply of 120Vac/0Vac (a source with a grounded neutral) were higher than an AC supply of +60Vac/-60Vac (a source from an isolation transformer.) I changed my test setup to use a grounded neutral to agree with installation practices. Now I have to justify this to someone, and would like some supporting paperwork. It's not easy justifying something that may uncover problems. Also, does the AC voltage supplied to homes & small businesses in Europe have a grounded phase, or are both phases above ground? Pat - ---------------------------------------------------------------- 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) <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 <[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://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]>
