Hello Don, There are some transformer designs for which UL 60950-1 will provide all of the required information. Some transformer constructions for switch-mode supplies use triple insulated wire as part of the separation between the primary and SELV. For these, you can use UL 60950-1 as a guide to the creepage and clearance distances. As noted before, UL 60950-1 is a lousy document to use for designing transformers. It only tells you the basic information but gives no guidance on good design. It won't tell you how to layer the windings, how to apply the tape or how to ensure that the tape is put down to give the proper creepage distances. A quick Google search will turn up a lot of useless information but has a few good links. http://www.google.com/search?hl=en&q=transformer+design+60950 One of them from Tyco provides some very basic information on designing a transformer to UL 60950. http://www.circuitprotection.com/techpapers/IEC_UL4.pdf Are you working with a transformer company to make custom transformers? If they have previous experience with UL 60950-1, they may be able to help. Ted Eckert The opinions expressed are entirely my own and do not necessarily reflect those of my employers.
"MacArthur, Don" <[email protected]> wrote: I am looking for a comprehensive standard, book, or technical article which describes designing a transformer to pass the safety requirements (Creepage, Clearance, Insulation Properties, etc.). Overall product must pass UL 60950. There seems to be a lot of standards out there to choose from. I would like to receive suggestions on best possible one(s) to purchase. Thanks, Don Don MacArthur Compliance Engineer General Dynamics Itronix Corporation 12825 E. Mirabeau Parkway Spokane Valley, WA 99216 ph: 509-742-1342 fax: 509-742-1672 email address: [email protected] <mailto:[email protected]> “This email message is for the sole use of the intended recipients and may contain GDC4S confidential or privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not an intended recipient, please contact the sender by reply email and destroy all copies of the original message.” - ---------------------------------------------------------------- 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 ________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. <http://us.rd.yahoo.com/evt=51733/*http //mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ> - ---------------------------------------------------------------- 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
