The simplified workflow is: Identify all accessible earthed parts. Measure the resistance using a high-current (≥10A) tester. Calculate the allowable limit by adding 0.1 Ω to the power cord's earth resistance. Verify all measured values are below this calculated limit.. The resistance of the main earthing conductor, measured between the main earthing terminal/connection or bar and the earth electrode, including the connection to the earth electrode, shall be not more than 0.5 Ohm.
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The document discusses testing the continuity of earth connections in electrical equipment. It explains that when a reading above 0.1Ω is measured, the resistance (Rc) of the cable must be calculated and subtracted from the reading to determine if the result is ≤0.1Ω, which would pass. The formula and steps to calculate Rc using cable size, length, and resistance values from tables are.. Our recommendation is to use the low current test (between 100 to 200 mA) unless there is a compelling reason to use a much higher current. PAT Testing - Test Limits As mentioned above, to pass this test, the Earth Continuity resistance has to be less than 0.1 ohm when PAT testing is carried out.
