Hi, Jody. Among the useful data that's available from QMTS2 is CTI. Using this data can aid in reducing the required creepage distances required, but it's not a part of ZPMV2 testing. ZPMV2 direct-support evaluations rely on the QMTS2 Recognitions for data not included in the ZPMV2 evaluations, so you should be able to rely on it for creepage distance evaluations.
ZPMV2 evaluations typically require long-term testing. You'll also need to think about the solder limits identified in the Recognition. Sometimes, if the material is a CCIL (copper clad industrial laminate), solder limits are preevaluated to provide guidance. If the material is not a CCIL, it's ability to withstand the rigors of processing are less certain. Also, solder limits for SMT processes are often relatively complex profiles that don't compare well with traditional bath or wave soldering times and temperatures. Regards, Peter L. Tarver, PE [email protected] > From: Jody Leber > Sent: Thursday, October 13, 2005 5:50 AM > > > All, > > I am trying to determine what the minimum > requirements are for a PCB used in a IEC 60950-1 > SMPS. The PCB supports primary circuits and is > single layer. The obvious requirements are > flammability, temperature and creepage. Does the > board require any other certifications? > > For example, in UL's certification database PCBs > are normally recognized under category ZPMV2. > The material in question is recognized under > QMTS2. The QMTS2 category covers the > flammability and temperature. The additional > ZPMV2 data includes conductor width and thickness > as well as solder temperature. I am aware that > additional testing is conducted to qualify a > QMTS2 material for the ZPMV2 category. > > I have not been presented with this situation > previously and was curious if anyone has been > down this path. > > Best Regards, > Jody Leber - 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/listserv/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
