DS DS/EN 61557-3
DS DSEN 61557-3 2007-APR-04 Electrcal safety n low voltage dstrbuton systems up to 1 000 V ac and 1 500 V dc - Equpment for testng measurng or montorng of protectve measures - Part 3 Loop mpedance
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This part of IEC 61557 specifies the requirements applicable to equipment for measuring the loop impedance between a phase conductor and the protective conductor or between a phase conductor and neutral or between two phase conductors by using the voltage drop when the circuit under test is loaded.