When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance.
Take mains AC, the cut off frequency is difficult to determine because we don't know the impedance so which capacitance do we pick? Can we assume a low resistance. Also, if the source is an alternator it will change the resistance to.
Is it common to put multiple of them in parallel to get the required range??
Also, will current draw in the circuit affect the value of capacitor? If we have more current flow do we need a bigger cap?
The Kemet R463R422050M2K is a possible device that could be used.