On 25 Mar 2009 at 23:17, Ron Pickard, RPQ wrote: > > Hi Don, > > Further to what Joe has stated below, according to IEC > 60950-1 an ethernet interface circuit is generally > characterized as an SELV circuit, but must also be > considered a TNV-1 circuit if it is subject to overvoltages > (atmospheric conditions).
Per one UL PAG, TNV classification does not apply, if the installation instructions state that the PoE system conductors do not allow such exposure; meaning they they remain indoors. > You might also want to read > through CENELEC CLC/TR 62102 (replaced ETSI EG 201212) > entitled "Electrical safety - Classification of interfaces > for equipment to be connected to information and > communications technology networks" Absolutely. I have recommended to some TC 108 members that TR 62102 be updated to include PoE. As of my last check (~FEB2008), it did not. > Although with that said, LPS may more likely be more of a > customer requirement rather than regulatory, whereby there > should be an adequate selection of LPS and non-LPS PoE > invertors. LPS selection should depend on a customer's > specific requirements and the specific application. IMHO, > for a safer installation, LPS PoE injectors should be > considered. There may be a semantic issue involved here. The 1.3 A limit I mentioned previously applies at the PoE output of the product (e.g., the modular jack), not at the power supply's output. I just wanted to be clear about that. Peter Tarver ptar...@ieee.org - 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>
