Hi Dan:
According to both IEC 384 and UL 1414, Y capacitors are rated
up to 250 V rms, not higher.
However, RIFA offers ac capacitors in their Y capacitor
catalog pages rated up to 440 V and 500 V rms (without
certifications). If you were to use one of these in a
certified product, then you would have to engage the
certifier to perform testing in place.
I suppose you can put to Y caps in series. Note that the
voltage divides inversely proportional to the capacitance.
According to the RIFA catalog, Y caps are 20% devices. So,
the voltage divider worst case would be 40% from the half-
way point, where one capacitor would have 240 V + 40% of
480 across it, 432 V. Not good for reliability, especially
for a safety component.
I suggest you talk with the various Y cap manufacturers to
find a suitable set of caps.
Best regards,
Rich
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