Hi Nick:
According to IEC 384-14 (1993):
Class X and Y capacitors are ac capacitors. An ac capacitor is
a capacitor "designed essentially for application with a power-
frequency alternating voltage."
Class X
=======
A Class X capacitor is a capacitor where failure of the capacitor
will not lead to electric shock.
A Class X1 capacitor is rated up to 250 V rms and is suitable for
Installation Category III (impulse-withstand is 4 kV)
A Class X2 capacitor is rated up to 250 V rms and is suitable for
Installation Category II (impulse-withstand is 2.5 kV).
Class Y
=======
A Class Y capacitor is a capacitor where failure of the capacitor
could lead to conditions for electric shock.
A Class Y1 capacitor is rated up to 250 V rms and is suitable for
bridging double insulation or reinforced insulation (impulse-
withstand is 8 kV).
A Class Y2 capacitor is rated more than 150 V rms up to 250 V rms
and is suitable for bridging basic insulation or supplementary
insulation (impulse-withstand is 5 kV).
I suggest you purchase a copy of IEC 384 as there are more details
regarding application than can be posted here.
Best regards,
Rich
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