This process is already underway by IEC TC74. Refer to docujment 74/502/CD, "Draft Technical Report, Electrical Safety; Classification of interfaces for equipment to be connected to information and communications technology networks." (about 30 pages) Available from your country's IEC TC74 technical advisor.
Bob Johnson Peter Merguerian wrote: > Dear Group, > > I wish to collect information from all members regarding the various > interfaces used in ITE and Telecommunication Equipment today > and assignment of the following designations according to EN 60 > 950/ UL1950/ IEC 950 Standards for each interface: SELV, TNV-1, > TNV-2, TNV-3 and Hazardous Secondary. Such interfaces can be > data/telecom/satellite interfaces (example: RS-232, 10BaseT, > 100BaseT, PSTN, E1/T1, ISDN S, ISDN-U, VSAT ), Remote Power > Feeding interfaces (example: HDSL), Cental Office DC Supply, > Wireless System Interfaces, etc. etc. Also, please assign the > maximum dc and ac voltages involved for each interface. > > Once I gather all of this useful information, I plan to make a Table > and post it to the whole group. > > Note that for some interfaces, such as E1/T1 the assigned "rating" > may be either TNV-1 or SELV depending on whether the interface > goes outside the building and subjected to overvoltages or stays > within the building and is not subject to overvoltage. Your list > should therefore include some notes when a circuit may have dual > ratings depending on application. Another example is CO dc > supplies which may be considered TNV-2 , SELV or Hazardous > Secondary depending on country and the maximum supply voltage > rating. > > I look forward to hearing from all of your safety/telecom experts out > there. Let's help each other overcome the tremendous burden in > evaluating separation requirements when designing equipment with > various interfaces. > > Regards, > > > 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 > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
