Dear Ken its a 19 inch rack mountable product with a backplane and several submodule plug-in pcb's. It has a metall case for mounting it into a 19 inch rack. >From the protection class point of view its a class I (protection earth) product. Good point regarding assembly failures and wiring failures. We will performing an analysis and document it.
My argument for not doing an isolation test on the assembled system is that it will test only solid insulation which is allready tested at subunit level. Maybe screws which are fallen in can be detected with that test. I want to render the argument pointless which states that one can detect a clearance distance violation due e.g. too long screws with such test. Verification of clearances uses much higher test voltages which depends on the height above sea level. The hipot test is also done with voltage levels which tests the solid insulation and not the clearances. Best regards Kurt Beneder On Sun, Sep 3, 2017 at 6:10 PM, IBM Ken <ibm...@gmail.com> wrote: > Hi Kurt! > At the system (end product level); > > -Do you add a PDU and plug on the manufacturing line and plug all the > modules into it? > -Do you have small screws, wires, etc which are used to assemble the end > product which might fall into the product? > -Do you have any opportunity for miswiring/misplugging? > > In most cases, it's a good idea to hipot the assembly as a complete > product at the end of the manufacturing line. It is not usually required > to re-do each module hipot test separately, but rather just once at the > Mains input (but I don't know the construction of your product). > > Regarding your comment about height above sea level; the hipot test is > based on the working voltage and the maximum operating altitude as designed > (it is not dependent on the actual altitude of the factory). > > -Ken A > > > On Sun, Sep 3, 2017 at 11:28 AM, Kurt Beneder <kurt.bene...@ieee.org> > wrote: > >> Hi all, >> >> i am defining the routine tests for a 19 inch Rack System according to >> IEC 60950-1 and IEC 62368-1. >> We test routinely the solid insulation of each submodule during >> production. >> The final system is variable, so some modules are sometimes in the system >> or not, depending on the configuration from the customer. >> >> The question for me is wether a routine test of the solid insulation of >> the final product is still necessary. >> Especially if one has many circuits with hazardous voltages (relais >> contacts, power supply, other hazardous voltage outputs) which increases >> the test effort. >> >> As far as i know the test voltages applied according the standards are >> for verification of solid insulation only. >> This is done in our case at the subassembly level: every circuit against >> every other circuit of the submodule >> So the argument sometimes that we have to retest the whole device for >> verification of the clearances, >> which could be compromised during assembly of the final product, is not >> valid for me >> as this would require much different and higher voltage levels dependent >> on the height above sea level of the test site. >> >> What is your opinion? >> >> Best regards >> >> Kurt Beneder >> - >> ---------------------------------------------------------------- >> >> 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 < >> emc-p...@ieee.org> >> >> 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 <sdoug...@ieee.org> >> Mike Cantwell <mcantw...@ieee.org> >> >> For policy questions, send mail to: >> Jim Bacher <j.bac...@ieee.org> >> David Heald <dhe...@gmail.com> >> > > - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
