Brian, It is puzzling why the CSDS Proposal for 6.5.2.4 would reference the Voltage Test (Hipot). I wonder if this was in error.
In UL61010-1 3rd Ed. annex F "Routine Tests", F.3.1, I believe this is referring to the HiPot test that you would perform on 100% of your production. It states, "The test voltage may be a.c. or d.c. or impulse voltage withstand test ......." . So for the HiPot test we are most familiar with it already says you can use ac or dc. In most other sections of the standard where it refers to using the hipot voltage test to check the conformity of insulation, creepage, or clearances, if generally states something like, "Conformity is checked by inspection, and by the a.c. test of 6.8.3.1 with a duration of at least 1 min, or for MAINS CIRCUITS stressed only by d.c., the 1 min d.c. test of 6.8.3.2, using the applicable voltage from Table 5." So in this case it states to use the AC Hipot test, "OR or for MAINS CIRCUITS stressed only by d.c., the 1 min d.c. test of 6.8.3.2". What does "stressed only by d.c." mean? How are Mains Circuits stressed by d.c.? Do you think the CSDS Proposal has something to do with this wording? Does this make it sound like we can only use the AC hipot test? Thanks to all. The Other Brian -----Original Message----- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: Monday, June 23, 2014 8:31 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] UL61010-1 CSDS Proposal for 6.5.2.4 This is excerpted from the latest UL61010-1 CSDS Proposal for 6.5.2.4 Impedance of PROTECTIVE BONDING of plug-connected equipment: "It was proposed that all hi-pot tests should be permitted to be performed with either ac or dc, particularly because OEM power supplies often fail when tested with ac, but pass when tested with dc. This seems to be because IEC 60601-1 3rd edition, IEC 60950, and IEC 62368-1, to which most of these power supplies are tested, permit either ac or dc testing. The consensus of ISA 82 is that this change is appropriate. It is also recommended that this change be reflected in the US comments on Part 1 by the USTAG." Ok, why are component power supplies failing AC, but passing the equivalent DC withstand test levels? If from reactance, just control dv/dt (many standards provide a min rate). And what does the protective bond test have to do with the test conditions for di-electric withstand? Or am I missing something obvious? Brian - ---------------------------------------------------------------- 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
