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 <[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]>
