Guidelines from WIMA about selecting capactiors for pulsed conditions. Link here
The maximum permissible AC voltage that can be applied to capacitors in sinusoidal waveform applications, can be determined from the graphs in the respective capacitor ranges.
However, where pulse conditions exists, the following procedure is to be observed to ensure that the correct capacitor rating is selected for a particular duty:
– Rated voltage
– Maximum current
– Determining the permissible AC voltage and AC current at given frequencies