Piotr, I believe these clauses apply to ac or dc mains and protective earth connections, you can connect signal lines any way you like. Regards, David Gelfand Product Integrity Mitec Telecom Inc 9000 Trans-Canada Highway Pointe-Claire, QC Canada H9R 5Z8 514 694 9000 x2262
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Piotr Galka Sent: 31 août 2006 07:44 To: EMC-PSTC Subject: EN 60950-1 and 3.5mm terminal blocks All, Can I use 3.5mm terminal blocks in device under EN 60950-1 ? Device is powered by 12V DC LPS source. For connecting external signals (5V OC 2mA) cables with 0.5mm diameter wires (0.2mm2) are used. Each conductor is single wire so I understand these are not flexible cords. 3.5mm terminal blocks accept 0.14mm2 to 0.75mm2, but EN 60950-1 3.3.4 needs for other cables (as not flexible cords than other) terminals accepting up to 2.5mm2. It looks that it is for all connections because: 3 Wiring, connections and supply 3.3 Wiring terminals for connection of external conductors 3.3.4 Conductor sizes to be connected. I also worry if standard 3.5mm terminal blocks agree with EN 60950-1 3.3.6: "Terminals shall be so designed or located that the conductor cannot slip out when the clamping screws or nuts are tightened." Do 5V 2mA signal lines really need so much care or I missed something. Thanks in advance. Piotr Gałka - ---------------------------------------------------------------- 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 ______________________________________________________________________
