IEC 61557-3 Ed. 3.0 b:2019

IEC 61557-3 Ed. 3.0 b:2019 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 3: Loop impedance
standard by International Electrotechnical Commission, 07/26/2019

More info

Full Description

IEC 61557-3 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.