For example, in ISO7220C,
I can find VDE, CSA, and UL information, and in VDE(IEC 60747-5-2),
Basic Insulation
Maximum Transient Overvoltage, 4000 VPK
Maximum Surge Voltage, 4000 VPK
Maximum Working Voltage, 560 VPK
But I cannot find any test or apply information of the three parameters, so I cannot determine the isolated voltage in real application.
And from the three parameter, I guess the test signal is AC voltage,
but how can I evaluae it when I apply ISO7220c in isolated DC voltage?