KS C IEC 61557-8:2019 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 8: Insulation monitoring devices
2019KS C IEC 61557-8:2019 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 8: Insulation monitoring devices
2013KS C IEC 61557-8:2013 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 8:Insulation monitoring devices for IT systems