How Electrically Insulating Boots are Tested Manufacturers must test every piece of dielectric footwear to EN 50321-1:2018. The test involves filling the boot with water and submerging it in a water bath, an electrode is placed inside the boot, with a second electrode connected to the metal frame of the bath. A test voltage is then applied. Boots are tested at the appropriate leakage current test voltage for their class rating (see table below) for three minutes during which the leakage current must not exceed the maximum permitted value for the class rating. For certification, boots are tested to the withstand test voltage, but this is considered a destructive test. Workmaster™ test all of their boot and overboots with alternating current (AC) as standard, but Direct Current (DC) testing is available on request. Class Rating Maximum Working Voltage Withstand Test Voltage Leakage Current Test Voltage Maximum Leakage Current Class 00 500V 5kV 2.5kV 3mA Class 0 1kV 10kV 5kV 5mA (8mA) Class 1 7.5kV 20kV 10kV 10mA (16mA) Class 2 17kV 30kV 20kV 18mA Class 3 26.5kV 40kV 30kV 20mA Class 4 36kV 50kV 40kV 24mA