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Reference.org
Appliance classes
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<p>Appliance classes (also known as protection classes) specify measures to prevent dangerous contact voltages on unenergized parts, such as the metallic casing, of an electronic device. In the electrical appliance manufacturing industry, the following appliance classes are defined in <a href="/facts/International_Electrotechnical_Commission/hSK0kjwI">IEC</a> 61140 and used to differentiate between the <a href="/facts/Ground_(electricity)/F6TEMIVv">protective-earth</a> connection requirements of devices. </p>