A DC hipot test can usually be substituted for
an AC hipot test. The best voltage for a DC
hipot is normally higher than the AC test voltage
by a factor of 1.414. A product that would be
tested at 1500V AC would be tested at 2121V
DC.
For double-insulated products, the required test
voltages may be much higher, such as 2500
VAC or even 4000 VAC for a 120 VAC power
tool. The voltage is applied between the operating
circuits and the chassis or ground - the
parts of a product that a consumer might touch
or otherwise come in contact with.
Refer to Figure 5 for typical AC hipot test
setups. The setup for a DC hipot test would be
identical.