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The protocols for PAT Testing vary by appliance class: Class I – Single insulated wiring, which requires an earth connection for safety. If the appliance has no symbol on it, then it is to be treated as Class I for the purpose of testing. Class II – Double insulated wiring, The earth clamp is still connected during the insulation test.
This is usually achieved at least in part by having at least two layers of insulating material between live parts and the user, or by using reinforced insulation. In Europe, a double insulated appliance must be labelled Class II or double insulated or bear the double insulation symbol: ⧈ (a square inside another square). As such, the ...
In electrical engineering, a dielectric withstand test (also pressure test, high potential test, hipot test, or insulation test) is an electrical safety test performed on a component or product to determine the effectiveness of its insulation. The test may be between mutually insulated sections of a part, or energized parts and ground.
Live testing. Earth fault loop impedance testing: this test is to check that if a fault did occur, that the system meets requirements to cause a disconnection of the supply within the time limit specified by standards Insulation resistance testing Polarity test: a test to check that the connections are connected in the right sequence
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Basic insulation is any material added to protect a user from accidental contact with energized parts. Supplemental insulation is rated to withstand 1500 volts AC. Double insulation is a design concept where failure of one insulation system will not expose the user to a shock hazard due to the presence of a second independent layer of insulation.
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The term 'PAT testing' then starts to make sense, and refers to the process of using PAT equipment. Rizlad ( talk ) 23:22, 10 December 2012 (UTC) [ reply ] The opinion above appears to be a personal view not supported by any evidence.