Dear group, I have a question on defining the RATED VOLTAGE that should be applied to TNV in UL1950 Clause 6.3.3.1 "Additional Test" for "separation between telecommunication network and earth" (Figure 17) for a Class III device that operates from an external nominal 12VDC (SELV) Listed Class II Level 3 adapter. I know by definition RATED VOLTAGE 1.2.1.1 is the primary voltage as declared by the manufacturer. I see that this is obviously the case if the power supply is physically part of the equipment and directly mains powered. In this case it is a seperate module.
Should I use as the the RATED VOLTAGE for this test the upper limit of the mains voltage to the adapter (125VAC) or can the test be done at the rated voltage of the EUT (e.g. 16VDC)? If it's the "mains voltage" to the adapter, then in reality its seems we are re-testing an already Listed and proven adapter where there should be no more than 0.25ma leakage. Your responses are greatly appreciated. ------------------------------------------------------------------------------- Larry Barnette Compliance Engineer GAI-Tronics Corp. Memphis Facility Instrument Associates Division 2455 Harbor Ave. Memphis, Tenn. USA 38113 larry_barne...@instrumentassociates.com Phone: 901-947-4000 Ext. 176 Fax: 901-948-0471 --------------------------------------------------------------------
