IEC 61557-3 Ed. 1.0 b:1997
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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 3: Loop impedance
International Electrotechnical Commission , 02/14/1997
Pages: 15
Specifies requirements for 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.
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