In a message dated 98-10-12, Mel Pederson writes: << If one considers the worst case (DC) voltages that could possibly exist on TNV-3 lines and also SELV circuits, and considers the likelihood that these are at opposite polarity, one would obtain a worst case 180VDC = -120VDC (TNV-3) - 60VDC (SELV). >>
Mel: I have a vague recollection that somewhere in EN 60950, it states that for purposes of determining working voltage, SELV circuits can be assumed to be zero volts. Perhaps this explains the slight difference in your calculations of working voltage from the calculations of the labs you reference. Joe Randolph --------- 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).
