IEC 61557-4 : 2.0
IEC 61557-4 : 2.0
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 4: RESISTANCE OF EARTH CONNECTION AND EQUIPOTENTIAL BONDING
International Electrotechnical Committee