Re Ted's message, Ted is of course correct if the unit is a simple device without ports for interconnection to other apparatus and no user contactable parts. Such a case may apply to a simple (POTS) telephone. There are no ports, no user accessible parts (other than insulation) and, if mains powered (such as loudspeaking) has a power supply barrier between mains and TNV. In such a case, the power unit would be hardwired or use carefully selected plugs etc. to prevent user contact at the power (low v) connector. The telephone body insulation is the barrier between user and TNV. In this case, all secondary circuitry is declared at the appropriate TNV level.
Bill Ellingford ---------- From: [email protected][SMTP:[email protected]] Sent: 17 February 1999 18:15 To: [email protected] Subject: Re: EN60950 TNV CIRCUITS Hi Ted I do not quite understand your question about my SELV requirement for the circuitry behind the line interface. Could you be a little more explicit and perhaps give me an example of what you mean. I do not consider any question silly. Without questions we do not get answers, even if they are not the answers we want. Regards Joe Schembri [email protected] RCIC - http://www.rcic.com Regulatory Compliance Information Center
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