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Appliance classes
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{{Short description|Electrical appliance manufacturing industry protection classes}} {{More citations needed|date=June 2022}} '''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 [[International Electrotechnical Commission|IEC]] 61140 and used to differentiate between the [[Ground (electricity)|protective-earth]] connection requirements of devices.
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