Ken, Depend on the type of transformer, such as isolating or signal, you should be aware of the following:
1. The temperature rating would dictate the insulation class A (105), B (130), and so on... in accordance with IEC85. These insulating systems will identify the tapes, wires, plastic material, varnish. Every time you request for the substitution of these component, you must ensure that new components are specified in the insulation system. 2. It does not matter that your company or your vendors manufactured this transformer, UL will require a copy of winding sheet, a BOM for review, that including type of tapes, bobbin material, sleeving... and constructional such as margin, creepage. 3. Your transformer is customized and use in only one power supply model, it is not required this xfmr bear the UL recognition mark. Many manufacturers provides the UL recognition mark on transformers , but the end-users must verify the thermal, short circuit test... per specific application. 4. If you have a second source (more than one vendor) for this xfmr, then your report must identify all vendors and theirs insulation system. Please note that only UL has this requirement, other agencies determine the temperature class by the rating of material without additional tests as an insulation system. Tac Pham Power-One TSD 949-261-2200 -----Original Message----- From: Matsuda, Ken [mailto:[email protected]] Sent: Saturday, April 21, 2001 1:38 AM To: [email protected] Subject: Transformer Question Group, I was wondering if you could help me with this one? Currently, I have a switching power supply, using custom transformers. Now I am looking at submitting this product to a agency... Many transformer manufacturers claim they build to UL ...standards, obviously, this is not considered approved, but are there transformer houses that can manufacture transformers that are considered recognized components under a program similar to a sign shop program, where customers can request custom wound transformers that are covered under the UL recognition ? Thanks for any input, Ken ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
