Moshe Hello! Let me re-phrase your question. You are asking is a transient voltage suppressor can bridge "basic insulation" between a TNV-3 circuit as defined in UL1950/EN60950 and an unearthed chassis?
Personally, I believe this is OK for North America (if you are using a Recognized suppressor suitable for the ratings). However, this could cause problems for Europe where spark gaps are preferred. Before you implement the design of your telephone interface, I suggest you consult with the appropriate Third Party Safety/EMC Telecoms Certification Agencies who will eventually test and Approve your equipment. > Hello everyone, > > In a telecommunication device I need to connect a transient suppressor from > the phone line > to the metal chassis, which is not safety grounded. (I believe this is > defined a class II > device). > Are there any special considerations / limitations in this condition? > > thanks in advance, > moshe > >d > PETER S. MERGUERIAN MANAGING DIRECTOR PRODUCT TESTING DIVISION I.T.L. (PRODUCT TESTING) LTD. HACHAROSHET 26, P.O.B. 211 OR YEHUDA 60251, ISRAEL TEL: 972-3-5339022 FAX: 972-3-5339019 E-MAIL: [email protected] Visit our Website: http://www.itl.co.il
