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The voltage rating for a capacitor is its maximum allowed peak DC, which is 1.414 times higher than its sinewave RMS maximum voltage rating.
So if the voltage to a capacitor is 25VAC then the capacitor must have a voltage rating of at least 35V and a 100V capacitor can be used for good reliability.
Note that some types of capacitors are polarized and blow up if their polarity is backwards.
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