Plugs can be classified according to their functions into: earphone plugs, DC plugs, audio plugs, USB plugs, video plugs, microphone plugs, charger plugs, mobile phone plugs, etc. Internationally, household appliances are divided into three categories: one type: electrical appliances have only one layer of insulation measures, and these types of appliances must be equipped with leakage protectors and grounding protection (that is, three pin plugs). Such as air conditioning, machine tools, motors, etc. Class 2: Electrical appliances have double-layer insulation measures and need to be equipped with leakage protectors, which can be used without grounding protection (that is, two pin plugs can be used). Such as televisions, electric fans, desk lamps, induction cookers, electric pottery stoves, etc. Category 3: Electrical appliances are those that use safe voltage, typically 12-36V, such as mobile phones, laptops, etc. Classified according to safety regulations: UL/UL, VDE, CCC, T-MARK, SAA, BSI, PSB, SABS, PSE, SNI UC and other countries' plug certification abbreviation: China: CCC United States: UL/CUL Canada: CSA United Kingdom: BS Netherlands: KEMA Belgium: CEBEC Switzerland: SEV Germany: VDE France: NF Italy: IMQ Norway: N Denmark: DEMKO Finland: FI South Africa: SABS Sweden: S Japan: PSE South Korea: KTL Australia: SAA New Zealand: SANZ Argentina: IRAM Brazil: INENTRO According to structure, it is divided into plugs, sockets, and connectors. Plugs and sockets are generally divided into two pole plug and two pole grounding plug. Electric current flows through, so here we tell everyone that as long as any electrical appliance is not in use, it is necessary to unplug it to save electricity. For power supply products, there are usually four terms: 1. Plug. The part that is connected to the power cord and has a male plug, and its full name should be called a plug connector. For a two legged flat plug, it is sometimes spelled duck head in English. 2. Connector. Refers to the part connected to the power cord and equipped with a female jack socket. 3. Appliance input socket (inlet). Its state is similar to 1, but it is installed on fixed bodies such as electrical appliances without connecting wires, including those installed on the socket body. 4. Socket. Its status is similar to 2, but the installation position is the same as 3. The full name should be called appliance socket. We often confuse 2 and 3 in these four words ourselves, often referring to those with pins as plugs and those with holes as sockets, but in reality they are different
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