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The decision as to the necessity of a protective conductor test in this case is to be taken by a qualified electrician who should also assume responsibility. You can omit the protective conductor test by pressing the key as soon as the following instruction is shown: „Please connect the probe with the protective conductor of the DUT“. Protective Conductor and Insulation Resistance Measurements for Permanently Installed Devices Under Test ! Attention! Deactivate the electrical system which suppli