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Things to consider, Class-X and Class-Y capacitors are classified according to:
their peak voltage/rated voltage and
the peak impulse voltage that they can safely withstand.
Class X, or line to line capacitors are designed to fail closed and failure may result in fire.
Class Y , or line to ground capacitors are designed to fail open and failure may result in electric shock. X1 and Y1 safety capacitors are used in industrial settings.
As an example, a subclass X1 safety capacitor would be used for an industrial lighting ballast that is connected to a 3-phase line.
Are X2 and Y2 safety capacitors interchangeable?
A Y2 capacitor can safely be used in place of an X2 capacitor, but an X2 capacitor should not be used in place of a Y2 capacitor. An X2-type capacitor would work and filter noise sufficiently, it would not meet the line-to-ground safety standards. Y2 safety capacitors are more robust, are able to withstand higher peak impulse voltages, and are designed to fail open as opposed to failing short.
There are also safety caps that combine aspects of X and Y types, such that they have met both X and Y safety requirements and standards. So for an X1/Y1 combination, this simply means that the capacitor can be used either as an X1 capacitor in a line-to-line application or as a Y1 capacitor in a line-to-ground application.
Line voltages or circuits need consideration of proper safety capacitors that should be selected.
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