61557-3-1997 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 (Edition 1.0)
Securite Electrique Dans Les Reseaux De Distribution Basse Tension De 1000 V c.a. Et 1500 V c.c. - Dispositifs De Controle@ De Mesure Ou De Surveillance De Mesures De Protection - Partie 3: Impedance De Boucle (Edition 1.0)
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