The full advertised word for PAT testing is “Portable Appliance Testing”, but it is known as PAT testing. PAT testing is a process by which electrical appliances are routinely checked for safety. The test involves a series of
inspections and electrical tests on each item. The PAT test varies depending on the class of the item. Class I has a single insulated wiring, which requires an earth connection. There is no symbol for a Class I product so if a rating plate has no symbol on it then it is usually Class I. Class II has a double insulated wiring, therefore no need for an earth lead. Class II is indicated by double box. Class III – These are appliances that are supplied at a low voltage (usually called Separated Extra Low Voltage) which must be less than 50 V.
These appliances are supplied with a transformer supply that is also marked. At first there´s visual inspection of the plug casing, the appliance flex, the plug wiring, and the plug fuse rating. Then a sequence of electrical tests are performed with the PAT Tester depending on the class of the equipment: Insulation tests, earth continuity tests, touch leakage tests, leakage tests and polarity tests.
You connect the device with cables (plug) to the PAT Tester and the PAT tester to the power supply. PAT testing is carried out to ensure the safety of employees. These tests are important for every company, which has electrical machines or devices, because of many work injuries due to the uncertainty of devices.
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