Thanks Brian. Since posting this, I just found that IEC 60695-11-10 (similar to part of UL 94) more clearly addresses these criteria inline with Int.1 (1st criteria) and Int.2 (2nd criteria) below. Unless someone disagrees, no further discussion needed on this topic.
Nick From: Brian O'Connell [mailto:[email protected]] Sent: Monday, January 12, 2009 3:02 PM To: Momcilovic, Nick (GE Healthcare); [email protected] Subject: RE: UL 94 Table 8.1 Interpretation example based on tests done with UL personnel - the 94V-0 rating is based on: Flaming combustion time for each specimen less than or equal to 10sec - AND - Summation of total flaming combustion time for all 5 specimens of any set less than or equal to 50 sec for each individual test, any single failure requires a complete new sample set, where no failures are allowed. also interested in hearing about requirements of any other NRTL when the test standard is UL94. From: [email protected] [mailto:[email protected]]On Behalf Of Momcilovic, Nick (GE Healthcare) Sent: Monday, January 12, 2009 12:01 PM To: [email protected] Subject: UL 94 Table 8.1 Interpretation I have heard two interpretations for the first two criteria conditions shown in Table 8.1 of UL 94. If you are familiar with the flammability testing of UL 94, let me know which interpretations you believe are correct. I have heard arguments for both. First criteria - "Afterflame time for each individual specimen t1 or t2" Int.1 - both t1 AND t2 have to be equal or less than x-seconds Int.2 - either t1 OR t2 can be less than x-seconds Second Criteria - "Total afterflame time for any condition set (t1 plus t2 for the 5 specimens)" Int.1 - t1+t2 for each individual sample has to be equal or less than x-seconds Int.2 - t1+t2 for all 5 samples cumulative has be equal or less than x-seconds Regards, Nick Momcilovic - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
