When conducting a DC hi-pot test, voltage is gradually raised to the specified value with a steady rate of rise that produces a consistent leakage current until the final test voltage is reached. Anywhere from a minute to 90 seconds is generally considered sufficient for reaching the final test voltage.

The final test voltage is then held for 5-15 minutes and if leakage current is not high enough to trip the test set, the insulation is found to be acceptable. This type of test is usually performed after cable installation and repair.

DC hipot testing measures the insulation resistance of cables by applying high voltage and measuring leakage current, and the resistance is calculated using Ohm's law. The test voltage values for DC hi-pot tests are based upon final factory test voltage, which is determined by the type and thickness of insulation, the size of conductors, the construction of cable, and applicable industry standards.