There is no good correlation between the IEC Glow Wire test and the UL 94 Vertical flame tests. The UL 94 tests expose a sample to a flame and intentionally ignite the sample. The test determines how fast the material burns and whether it is self extinguishing. The Glow Wire test has a different purpose and it will measure how easily a material ignites.
The closes UL standard is UL 746A - Polymeric Materials - Short Term Properties. This standard includes the UL Hot Wire Ignition (HWI) test. The Hot Wire ignition test has a different procedure from the Glow Wire test, so there is no easy correlation. The HWI test measures time to ignition and then gives a Performance Level Category (PLC) based on the results. The PLC goes from 0 to 5, with lower numbers meaning a longer time until ignition. Ted Eckert American Power Conversion/MGE http://www.apc.com/ The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC, MGE or Schneider Electric. The speaker does not represent APC's, MGE's or Schneider Electric's official position on any matter. "Kim Boll Jensen" <[email protected]> Sent by: To [email protected] "EMC PSTC" <[email protected]> cc 04/19/2007 08:32 Subject AM Glow-wire test Hi all Is it possible to make any comparison between UL 94 Vx and the different glow-wire tests according to IEC 60695-2-1. Just a rule of thumb would be fine. Best regards, Kim Boll Jensen Bolls Rådgivning Ved Gadekæret 11F DK-3660 Stenløse Tlf.: 48 18 35 66 Fax: 48 18 35 30 Mobil: 22 99 69 91 E-mail: [email protected] web: www.bolls.dk - 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 email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
