The sample shall with stand an A.C. voltage of 2000 volts having a frequency of 50 Hz for a period of 15 minutes after conditioning in a water Bath at 27 ± 5 Deg C for a period of 24 Hours without break down.The sample shall with stand an A.C. voltage of 2000 volts having a frequency of 50 Hz for a period of 15 minutes after conditioning in a water Bath at 27 ± 5 Deg C for a period of 24 Hours without break down.