GOST R IEC 61557-3-2006 Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 3. Loop impedance
IEC 61010-1:1990 Safety requirements for electrical equipment for measurement, control, and laboratory use; part 1: general requirements
IEC 61557-1:1997 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring and monitoring of protective measures - Part 1: General requirements
GOST R IEC 61557-3-2006 history
2006GOST R IEC 61557-3-2006 Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 3. Loop impedance