IEC 61557-4 Ed. 3.0 b:2019

IEC 61557-4 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 4: Resistance of earth connection and equipotential bonding
standard by International Electrotechnical Commission, 07/26/2019

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IEC 61557-4 specifies the requirements applicable to equipment for measuring the resistance of earth conductors, protective earth conductors and conductors for equipotential bonding, including their connections and terminals, with an indication of the measured value or indication of limits.