If any of the values are lower, than further investigation is needed. Test every circuit within the distribution board one by one, and record the test results on the Schedule of Test Results.
Pro advice: You can perform this test on a whole range of circuits in a single process. You can test between all of the Line conductors and all of the Earth conductors within the distribution board. After this step, between all of the Neutral conductors and all of the Earth conductors. The only down side is that if there is a low insulation resistance reading then you will have to test the circuits one by one to find out which one has the fault on it.
However, most of the time, you can save valuable time by insulation testing the entire board this way. In order to verify compliance with BS , you will be expected to perform insulation resistance tests on all of the circuits on the Inspection and Testing practical exam.
Charging current decays to zero much more rapidly than the dielectric absorption current. The steady-state current that flows through the insulation is called the leakage current. It is equal to the applied voltage divided by the insulation resistance. The purpose of the test is to measure insulation resistance. To calculate the IR value, apply the voltage, measure the steady-state leakage current after the dielectric absorption and charging currents have decayed to zero and then divide the voltage by the current.
If the insulation resistance meets or exceeds the required value, the test is successful. If not, the test is failed. Send a message Have questions or need a quote?
Log in Register. Login X Username or E-mail:. Remember me. What is insulation resistance testing? Purpose of insulation resistance testing Portable insulation resistance testers and megohmmeters are designed to help prevent hazards such as electric shock and short-circuits caused when the insulation in electrical devices, parts, and equipment used in industrial plants, buildings, and other settings degrades over long periods of use.
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