Double insulation

Electricity. Electronic devices are usually provided with basic insulation to prevent electric shock. In case the basic insulation is damaged, additional supplementary insulation is used, which is called double insulation. Devices with a high risk of electric shock due to leakage caused by water or dust often use double insulation.

For electrical appliances that require grounding, double insulation reduces the risk of electric shock, making it possible to omit grounding in some cases. According to the technical standards for electrical equipment, electrical devices with double insulation structures defined by the Electrical Appliance and Material Safety Act may be exempted from grounding work.