Using a capacitor substantially above its rated voltage will cause it to
fail. Failure may be leakage, shorter lifetime, greater losses or catching
fire or exploding. Actual results will depend on type of capacitor and
application.

Running an aluminium electrolytic capacitor SLIGHTLY above its rated value
will usually not hurt it appreciably. More than say 10% is unwise and even
that can cause major problems worst case.

        RM

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