X Cap & Y Cap :
X cap are line to line, 0.1-1 uF.
X1 for 3 phase line impulsed voltage tested at 4KV,
X2 for AC wall-let impulsed voltage tested at 2.5 KV.
Y cap are line to neutral ground. 4700 pF. small to limit AC leakage current.
Y1 for double insulation impulsed tested at 8KV,
Y2 for basic insulation impulsed tested at 5KV.