Peter - UL has no problem with components bridging the insulation, provided you comply with the appropriate testing in the standard and provide otherwise appropriate clearances and creepages (just as you expected).
In Europe, the Nordic countries require Supplementary insulation between SELV and TNV of any flavor, so you'll probably hit a knot there. If you can pass the tests (there are Deviations for the higher values for impulse and EST in Clause 6 of AS/NZS3260; I haven't seen the new edition of AS/NZS60950, but it's most likely the same) and provide Basic insulation, Australia and New Zealand should be OK with this, too. Regards, Peter L. Tarver, PE Homologation Engineering Nortel Networks ptar...@nortelnetworks.com -----Original Message----- From: Peter Merguerian [mailto:pmerguer...@itl.co.il] Dear All, Does anyone have experience with bridging resitors between TNV-3 to SELV? 1. What is UL's position? 2. What is the European position? TUV and others? 3. What is the position of other countries? My position is that if with the resistors, the circuit can withstand the required impulse and/or electric strength tests, there is no problem. Of course the required clearances and creepages between the resistor and the SELV circuits must be within the specified limits in the standard. Peter Merguerian Managing Director Product Testing Division I.T.L. (Product Testing) Ltd. Hacharoshet 26, POB 211 Or Yehuda 60251, Israel Tel: 972-3-5339022 Fax: 972-3-5339019 e-mail: pmerguer...@itl.co.il website: http://www.itl.co.il ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
