Original poster: "divyarajdesa by way of Terry Fritz <twftesla-at-qwest-dot-net>" <divyarajdesa-at-satyam-dot-net.in> hi all how does one calculate the a.c voltage rating of a cap. if u know its d.c voltage rating? i have made a capacitor bank rated -at-8kvdc, 0.01 uf. i want it to operate on 220vac, 50 Hz supply -at- 9kvac. how do i calculate the voltage rating of the capacitor bank? thanks raj