On Thu, 26 Aug 2021 12:22:26 +0200, Thomas Stolle <[email protected]> wrote:
> We have to recertificate a device. From EN62061 we changed to > EN61326-3-1. > In EN61326-3-1 in table 6 (german version) they discribe, that signal > lines, which connected to power supply have to test with 2kV symmetric > an 4kV asymmetric and such lines have to test with a > coupling/decoupling network for supply lines (2 Ohm or 12 Ohm) > We have a DC24V device. I don't understand why we must test the signal > lines with the twice of voltage of the power lines. Die signal lines > are connected to the same DC24V source like the power lines. > The device will be build in a cabinet (IP20) as part of a machine. > It's a safety-relevant device. > > Is this a faulty part of the standard? > > We will destroy about 18 devices, because we have to repeat every test > three times (criterion DS). I believe the test levels are intended to cover I/O ports directly connected to AC mains networks. Although the term "power supply networks" is not defined in the standard, can't you insist that those ports may be connected to local DC power supply but will not be connected to "power supply **networks**"? Regards, Tom - ---------------------------------------------------------------- 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]>
