UL 810:2019 pdf download.Capacitors.
12.3.1.4 Leads connected to the test terminals are to be 12 AWG (3.3 mm2) or larger, and are not to bellonger than 2 ft(0.61 m).
12.3.1.5 The application of the voltage is to be continued for not less than 1 min after interruption of thefault current. lf there has not been reestablishment of current or any indication of a tendency to restrike(unusual heating，internal arcing, or the like) before the end of the 1-min interval, the performance isacceptable. If evidence of a tendency to restrike has been noted, the voltage is to be applied until it isdefinitely determined that complete and permanent interruption of the circuit has occurred,or until theultimate effect on the capacitor has been determined, but not longer than 2 h.Re-establishment of thecircuit that results in venting or enclosure rupture is not acceptable.
12.3.1.6 lf the protective device does not function after the circuit has been energized for at least 2 h, thesample may be replaced by a substitute sample of the same construction and fault condition, and the testis to be repeated.
12.3.1.7At the conclusion of the test, the dielectric withstand test is conducted.
12.3.2 Capacitors with segmented metallized electrode protection (no internal pressureinterruption mechanism)
12.3.2.1 Three samples of each size for each fault current, with induced faults prepared in accordancewith 12.2.2,are subjected to the rated maximum fault-test current and to the lower levels of fault testcurrents specified in Table 12.1.See Table 12.1 for samples required. The test method shall consist ofcycling the capacitors between a DC voltage used to break the capacitors down and the AC fault-testcurrent. In order to cycle the samples, they are connected to a circuit as outlined in Figure 12.1.
