Class X capacitors
Class X capacitors (X capacitors for short) are capacitors with an unlimited capacitance for use where their failure due to a short-circuit would not lead to the danger of an electric shock.
Class Y capacitors
Class Y capacitors (Y capacitors for short) are capacitors for an insulating voltage of U r.m.s =250 V with high electrical and mechanical reliability and limited capacitance.
The value of the Y capacitor is restricted by the permissible leakage current allowed. The maximum leakage current is governed by standards and regulations and depends upon the type of equipment
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