Ron, The leakage should be performed at 60 Hz and not 50 Hz which should give you slightly higher leakage. You must have connected the two inlets to a power strip and measured the leakage from the power strip cord. Is this correct? If so, try measuring the touch current from one inlet at a time while the other inlet is connected to its own source. Do you measure now less than 3.5 mA? If this is the case, you can provide a cautionary statement in the manual that each of the inlets is to be connected to its own dedicated branch circuit. I believe the designers have included the two inlets so that the installer connects each of the inlets to its' own dedicated power source. T Each inlet supplies two power supplies (total four) and in normal conditions they share the load between them. Under fault - power failure to one of the dedicated branch circuits - the other inlet is responsible for powering the two remaining supplies which are now handling all of the load. Best Regards, Peter
"Ronald R. Wellman" <[email protected]> wrote: Howdy all, I have come across a problem where a product is exceeding 3.5 ma of touch current. The product in question has 2 line filters and 4 Switching Mode Power Supplies. Because of the addition of the fourth power supply the overall touch current can be as much as 4.0 ma. Ideally, we do not want to make the product so it has to be hard-wired to the building mains. Because of the high touch current, does anyone know what the relationships are between different touch current sources? I've heard that touch current is not linear when you add up the different sources and phase shifts between L-G and N-G might be a problem. However, I'm looking for some detailed information on this issue so I can provide ways to investigate the problem and hopefully reduce the overall touch current. BTW, the product is not medical equipment and all touch current tests are done with the product operating at 264 V AC, 50 Hz. Best regards, Ron Wellman ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Sociiety emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Scott Douglas [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc _____ Do you Yahoo!? Meet the all-new My Yahoo! <http://my.yahoo.com> – Try it today! ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Scott Douglas [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
