The Megohm test is an accurate meas

The Megohm test is an accurate measurement of the insulation resistance of the ground
wall insulation. The test consists of applying a DC voltage, usually 1.7 times the
operating “line” voltage of the machine, and measuring the leakage current. The leakage
current measurement is taken 60 seconds after the test voltage is reached. The insulation
resistance, abbreviated IR, is calculated using Ohm’s law: