In order to ensure the electrical safety of any medical device, there are several tests that must be performed on each device before it can be shipped. In most cases these tests are required in order to comply with safety agency regulations. This article deals with two of the most widely performed production line safety tests commonly required on medical devices. The first and most prevalent test is the Dielectric Voltage Withstand Test, commonly known as a “hipot” test. Hipot testing is the deliberate application of high voltage between current carrying and non-current carrying components of the equipment under test (EUT). This test is designated to stress the insulation far beyond what it will encounter in normal use. If the insulation can withstand the higher voltage for a given period of time, it is assumed that it will be able to adequately protect medical personnel and patients from electrical hazards at normal operating voltage. This is the origin of the term “voltage withstand.”