Loop impedance testing

A low loop impedance is important for the protective devices to operate quickly in case of a short circuit. At the point of supply it should be below 0.4 ohms. In a domestic installation at a wall socket, value should be below 1 ohm. It surprised me that the loop impedance was more than 1.3 ohms with the two, six way power boards plugged into each other

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• #loop
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