On 3/25/2009, Don Umbdenstock wrote:
I have perused the IEEE 802.3af explanation on various web sites and examined supplier specs. I came to the conclusion that the injector should be LPS certified and marked as such. However, most of the injectors I have found by web search do not indicate LPS. Does anyone believe that a PoE injector does not require LPS certification? If so, why not? Hi Don: I'm not certain what you mean by "LPS certification," but if you meant to ask if the Ethernet side of the injector should be safety certified as a SELV circuit, I believe the answer is yes. For safety analysis per UL 60950 and other similar versions of IEC 60950, the voltages that appear on an Ethernet cable are generally considered to be SELV, whether or not the circuit has POE provisions. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) j...@randolph-telecom.com http://www.randolph-telecom.com <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 <emc-p...@ieee.org> 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 <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>