If the battery voltage is in line with ETSI Standard EN 300 132-2 that define the power interface in a telecom installation the voltage is in the range -40.5 to -57V and is considered SELV. See also the IEC TR 62102. Ciao PAolo
Paolo Gemma Siemens S.p.A. COM CRD MW ST EMC & Safety SS Padana sup. KM 158 20060 Cassina de' Pecchi (MI) Italy phone +39 022437 6587 fax +39 0224376375 mobile +39 348 3690185 e-mail [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of David Gelfand Sent: giovedì 31 agosto 2006 22.43 To: [email protected] Subject: -48Vdc powered equipment Hello group, My question is more market-oriented than technical. A friend is designing a -48Vdc powered voice over data product intended to be CE marked, and sold in Europe and Africa. The debate has come up whether to design the input as SELV or TNV-2. I understand that in Europe, battery voltages can exceed 60Vdc, in which case the input is considered TNV-2 and basic insulation is assured between input and SELV circuits. However this will be customer premise equipment, not for network operators. Are there other situations where battery voltages could exceed 60Vdc apart >from telco operators? His real questions are, Is it worth the extra expense to design in basic insulation? If he declares the input as SELV only will he lose potential customers? Thanks in advance, David David Gelfand Product Integrity Mitec Telecom Inc 9000 Trans-Canada Highway Pointe-Claire, QC Canada H9R 5Z8 514 694 9000 x2262 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
