Locating an insulation failure (identifying GFCI and RCD trip events)
By measuring leakage current of the entire circuit using the ground wire of the transformer (location 1 in the figure below), you can determine the presence or absence of an earth leakage in accordance with changes in leakage current.
When you find an earth leakage, perform the bundled measurement of all the wires from the power supply side toward the load side to locate an insulation failure.
To investigate an intermittent earth leakage, such as intermittent ground-fault circuit interrupter (GFCI) and residual-current device (RCD) trip events, the event recording function will help you.
When a measured value exceeds the set threshold value, the function records the event data (event occurrence time, event stop time, maximum value). The Z3210 Wireless Adapter (option) is required.
For detailed information, visit the GENNECT Cross website.
Single-phase 3-wire circuit
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If the insulation on the wire has deteriorated at location in the figure, you can detect the leakage current through the measurement by clamping around bundled wires, not at location 3 but location 2.
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If the insulation on the load device has deteriorated at location in the figure, you can detect the leakage current through the measurement by clamping around the bundled wires, not at location 5 but location 4.
