Hello Mike, There is a standard EN 50514 "Audio, video and information technology equipment - Routine electrical safety testing in Production" in EU which describes requirements for routine testing. This standard for example is used if your product bears ENEC mark.
There are mention values of 1500Vac (2120Vdc) for basic insulation and 3000Vac (4240Vdc) for reinforced insulation and time is 1-4 seconds. I hope this helps. Best regards, Bostjan From: Mike Cantwell [mailto:[email protected]] Sent: Wednesday, August 06, 2014 10:09 PM To: [email protected] Subject: [PSES] Routine HiPot Testing This seemed to me to be a simple question, but it's turned out to be one with different answers from the experts, so I'm confused. Reading section 5.2.2 of 60950-1, seems to say that an ITE product (computer server specifically) that is Overvoltage Category II can use table 5B to determine the test voltage, which is listed at 3,000 Vrms for reinforced insulation for an ac mains of 240 Vrms (340 Vpk). I understand that the working voltage in the power supply can exceed this value and many of our CB reports definitely show this, but the test voltage remains at 3,000 Vrms regardless. Further along in section 5.2.2, it says that for routine tests, the duration of the electric strength test can be dropped to 1 second and the test voltage of Table 5C (different table) can be reduced by 10%. But this table seems to imply that I can reduce the 3,000 V to a test voltage of 2,700 Vrms. Now table 5B (Part 2), for 340 V, the test voltage is 2,328 Vrms. If I reduce this voltage by 10%, the test voltage is 2,095 Vrms. If I want to do a DC hipot, the test voltage would becomes 2,963 Vdc. I have been given numbers everywhere from 1500 V to 3000 V, and I'd like to know what the proper test level should be. Is a different test level determined for every power supply based on working voltage for routine tests? or can one test level be determined and used for all hipot testing. As an EMC guy, the range I've been given by the safety folks is only 6 dB different and quite within the measurement uncertainty :) but something tells me that the safety folks will have a better number for the test levels and know the proper way it is derived. I would like to set the hipot testers to a single value if at all possible. Any help would be greatly appreciated on what the test level should be for a routine hipot on a computer. - ---------------------------------------------------------------- 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]<mailto:[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]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<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://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]>
