Mel, UL1492, the standard for Audio-Video Products and Accessories may have the answer for you on page 73, table 38.1. That table states that it depends on the application that the transformer is used for. Power, motor, and high-frequency transformers are to meet UL1411, and signal and coupling transformers are to meet UL 1876. Several notes apply, so it is important to read the table.
I referred to UL 1492 because it is the standard which supersedes (or is in the process of superseding) UL 1270 (Radio Receivers, Audio Systems, and Accessories), UL1409 (Low-Voltage Video Products without Cathode-Ray Tubes), and UL 1410 (Television Receivers and High-Voltage Video Products). Sorry, I have no inputs regarding CSA, nor Europe. Gabriel Roy Highes Network Systems MD The opinions expressed are those of Jim Eider's invisible friend. -------------- snip ------------ Hello good emc-pstc people: I have a question about line isolation transformers for consumer audio products. We are a transformer manufacturer, but the vast majority of our applications are for ITE equipment. My question is, 1) for UL & CSA approvals, what standard does an isolation transformer need to meet for consumer and professional audio products? I am currently referring to UL 1411 "Transformers and Motor Transformers for Use in Audio-, Radio-, and Television-Type Appliances". I want to make sure that this is the correct standard, i.e. is it the most current standard? What about for CSA? 2) for that matter, what about Europe? Is there much movement in harmonization for approvals for this type of product between the US, Canada, and Europe? Thank you much for all your help. Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 e-mail: [email protected] FAX: (605) 886-6752
