Hi Piotr: The easy way to answer your questions is to request a copy of the TUV report.
1. I suppose that 12 doorlock manufacturer can use only functional isolation betwean 12V and its metal casing as he can assume (I think) that he gets safe voltage. If I'm wrong with it let me know. Yes, only functional insulation between the 12 volts and the metal casing. 2. Then as doorlock metal casing can be touched by user than 12V have to be SELV circuit I think. Yes. SELV or PELV; makes no difference. 3. I'm not sure if the 12V output from this supply is SELV - is it enough to test the isolation with 3kV. No, 3 kV alone is not sufficient. The isolation must also meet creepage and clearance distances after being subject to a mechanical test of the isolation means and the conductors. Best regards, Rich - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
