Brian, I agree with Ted, but replace the standard with IEC/EN/UL 61010-1 (your end product standard). There is no reason to abide by other standards unless the 61010-1 standard refers to another standard. Best Regards, Peter
--- On Wed, 1/28/09, Ted Eckert <[email protected]> wrote: From: Ted Eckert <[email protected]> Subject: RE: Switching Transformer Safety Standards To: "Kunde, Brian" <[email protected]>, "[email protected]" <[email protected]> Date: Wednesday, January 28, 2009, 3:07 PM Hello Brian, These are some general guidelines and are not necessarily complete. You should be able to have the transformer evaluated under 60601 as part of your product. You will need to obey all of the creepage, clearance and insulation thickness requirements of 60601. You will also need to consider any required electric strength test from primary to secondary. Additionally, consider the maximum temperature expected when selecting your insulation materials. How you construct the transformer will depend on the type of bobbin you intend to use. I presume the bobbin selection will be based on a trade-off of cost, size and efficiency. If the transformer can be large an inefficient, the safety will likely be easier to manage. I realize that a lot of what I stated may be obvious, but it covers a lot of the basics of switch-mode transformer safety. The devil is in the details. Verifying all of the required parameters on a small transformer can be difficult as there can be many creepage paths. With a 2 kW output power, I presume that this won¢t be a small transformer. Ted Eckert Compliance Engineer Microsoft Corporation [email protected] The opinions expressed are my own and do not necessarily reflect those of my employer. From: Kunde, Brian [mailto:[email protected]] Sent: Wednesday, January 28, 2009 2:01 PM To: [email protected] Subject: Switching Transformer Safety Standards Greetings Transformer Experts, We need to design a custom switching transformer that runs at 25kHz, modulated 230VAC mains input and 4kVrms (.5A) output as part of a 4KV HV power supply. We want to design and test this transformer properly for safety so can anyone give us a list of construction and/or safety standards to cover UL, CSA, Europe and any international IEC requirements? We are not experts in the world of specialty transformer safety and usually rely on the manufacture for construction information but in this case we would like to get more involved with the details and knowing what standards to design to would be very helpful. The end product will be used in a piece of laboratory equipment. (61010-1). Thank you and best regards, The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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