Maybe not. Most isos > 1kVA have a removable plate on end-bell housing where the gnd terminal is exposed and can be disconnected. But body of xfmr must always be connected to PE. If output floated and neutral not referenced to PE, probably should have both output terminals fused.
Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Joe Randolph Sent: Tuesday, February 14, 2012 11:43 AM To: Grace Lin Cc: [email protected] Subject: Re: Isolation Transformers On 2/14/2012, Grace Lin wrote: We are preparing a product, with a transmitter module installed, to an Asian country for in-country testing. We are instructed to have the module installed in the end product during EN 300 328 transmitter testing (conducted method). The product is powered by 230V AC. Our engineers tell me if I do not isolate the ground, I will damage the receiver. Hi Grace: In selecting your isolation transformer, one thing to watch out for is that many "isolation transformers" actually carry the ground path all the way through. I learned this several years ago when I bought a pair of Tripp-Lite isolation transformers for use in my lab. I had to re-wire them to obtain the galvanic isolation that I was seeking. My impression is that many of the "isolation" transformers that are available on the market are intended for *noise* isolation, not *safety* isolation. The distinction is not always clear in the product literature. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) [email protected] http://www.randolph-telecom.com - ---------------------------------------------------------------- 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://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]>
