>From UL60950 Third Edition,
A.8.5 Compliance criteria No sample shall: - have a calculated rate of flaming or glowing greater than: * 40 mm/min for samples of a thickness of 3 mm; or * 75 mm/min for samples of a thickness of less than 3 mm; or - have flaming or glowing reach the 100 mm reference mark. On the presumption that this is the same as UL94, doesn't the logic say less than 40mm/min. or not reach the 100 mm mark? Jim Goedderz Tyco Safety Products/Sensormatic Product Safety Engineer x6378 _____ From: Camille Good [mailto:[email protected]] Sent: Friday, April 28, 2006 7:49 PM To: McInturff Gary; [email protected] Subject: Re: Rules for HB material <Does anybody have the actual UL 94 or the IEC burn specification?> Unfortunately, I don't -- which is annoying, because I thought I did! I think you are probably correct, but I honestly can't remember whether the requirement is BOTH self-extinquishing & burn-rate, or just one. However, I am wondering who you talked to at UL? They have a customer service department that is supposed to be able to answer that sort of stuff now, or at least know how to look up the answer. Also, if this is done as part of an ongoing UL evaluation, you may want to check with your UL project engineer to make sure it is ONLY UL 94 you are subject to. UL requirements for materials (like tubing & plastics in general) can vary by application, and you can easily find yourself in a different set of requirements than you originally thought. I am not that familiar with tubing, but I know there is a big leap when you go from a Recognized insulating tape and Recognized magnet wire, to a Recognized insulation system, but you can find yourself making that leap just because your transformer coils got hotter than you anticipated. -Camille Good Portland, Oregon McInturff Gary <[email protected]> wrote: Tried asking UL but no response. I have a special type of tubing that I am have manufacture red to UL94HB -40 and I am having a small hang-up with the acceptance criteria. Must the material be self extinguishing or is it just that the burn rate must be less than 40mm/min. The material is <= 3mm. I think the correct answer is OR condition - self extinguish before 100 mm OR have a burn rate < 40mm. The wrong interpretation, I think is the AND condition - self extinguish before 100 mm AND a burn rate < 40 mm Does anybody have the actual UL 94 or the IEC burn specification? Thanks Gary - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
