Did you do the test to see what happens? Maybe the battery drains before there's a risk of fire??
On Nov 17, 2014, at 7:22 AM, Greg McClure <[email protected]<mailto:[email protected]>> wrote: Charlie, The spacing between the pads where the SMT resistor is mounted may be so small that the resistor failure mode doesn't matter. The creepage distance itself may require consideration of a short between the pads as a valid single fault condition.. Gregory H. McClure Lexmark Product Safety 859 232 3240 office 859 232 6882 fax On Mon, Nov 17, 2014 at 4:40 AM, Charlie Blackham <[email protected]<mailto:[email protected]>> wrote: All Have a discussion with an NRTL regarding fault testing on the charge/discharge circuit for a 65mAh 3.1V coin cell battery in product being assessed against 60950-1. The NRTL insist on short-circuiting the single 560R current limiting resistor and I am unable to find any evidence that thick-film or thin-film surface mount resistors can fail short-circuit as they appear to fail open-circuit Now, we could add a 2nd series resistor, but that would require a board change - can SMT resistors fail this way, or are the NRTL being over-enthusiastic (unreasonable) Thanks Charlie Charlie Blackham Sulis Consultants Ltd Tel: +44 (0)7946 624317<tel:%2B44%20%280%297946%20624317> LinkedIn: uk.linkedin.com/in/charlieblackham/<http://uk.linkedin.com/in/charlieblackham/> Web: www.sulisconsultants.com<http://www.sulisconsultants.com/> Registered in England and Wales, number 05466247 - ---------------------------------------------------------------- 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]<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]>
