Hello Adam. The transformer is one of own designs and we are used to dealing with the safety agency regarding material approval documentation. Although the transformer satisfies class A insulation we would like to run the transformer a little hotter in some designs.
Regards; Ian McBurney Design & Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: [email protected] From: Adam Dixon [mailto:[email protected]] Sent: 19 May 2016 10:51 To: McBurney, Ian <[email protected]> Subject: Re: [PSES] Transformer insulation class Good morning, Ian, Are you using an "off-the-shelf" transformer or doing your own transformer design? What additional transformer information was provided to the testing agency regarding the design? My limited experience is that component-level specifications with (or without) associated agency certification details are provided to the test agency. Agency evaluates what testing must be done in light of component certifications and what data are included in the report (critical components list, etc.). If the transformer was originally agency-approved as Class A insulation-rated, then it sounds like you (or your transformer supplier) are faced with an amendment cycle to get Class B rating. If you are doing your own transformer design, seems very reasonable that your materials specification would justify the Class B rating. Will be interested to hear what the power supply experts say. Cheers, Adam in Atlanta On Thu, May 19, 2016 at 5:03 AM, McBurney, Ian <[email protected]<mailto:[email protected]>> wrote: Hello colleagues. The switch mode transformers we use in our power supplies are specified by the testing agency as insulation class A even though the materials used in the transformer are all rated for 130°C operation. We have asked the agency to up rate the transformer to insulation class B but the say they cannot do this as the transformer would have to be approved as a component. Is this correct? Many thanks in advance. Ian McBurney Design & Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: [email protected]<mailto:[email protected]> Allen & Heath Ltd is a registered business in England and Wales, Company number: 4163451. Any views expressed in this email are those of the individual and not necessarily those of the company. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> Allen & Heath Ltd is a registered business in England and Wales, Company number: 4163451. Any views expressed in this email are those of the individual and not necessarily those of the company. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
