Hello Carl, To make a medical power supply Listed, a brick power supply manufacturer must ensure that it is designed to have outputs that are suitable for patient connections. This would be quiet expensive and they instead go with less insulation to meet SELV requirements and thus Component Recognition. They figure that the end product manufacturer would provide the added insulation between the SELV and patient conections. There are Listed medical grade power supplies and transformers out there (maybe not too many Listed bricks) Best Regards, Peter Merguerian
--- On Mon, 11/2/09, Carl Newton <[email protected]> wrote: From: Carl Newton <[email protected]> Subject: Medical Grade Brick Power Supplies not Listed? To: [email protected] Date: Monday, November 2, 2009, 12:19 PM Dear List Members, I'm new to medical safety compliance and I've been told that medical grade external (brick) ac/dc converters can only be R/C and not Listed. I've done some brief searches in the UL database and elsewhere and that does appear to be the case at a glance. Would one of you with experience with this issue please confirm or deny? It's my understanding that the two issues for medical grade are low leakage current and high electric strength. I don't understand why the medical grade brick can't be Listed. Thanks in advance, Carl - ---------------------------------------------------------------- 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
