EN 61557-8:1997 Electrical Safety in Low Voltage Distribution Systems up to 1 kV a.c. and 1@5 kV d.c. - Equipment for Testing@ Measuring or Monitoring of Protective Measures; Part 8: Insulation Monitoring Devices for IT Systems
2015EN 61557-8:2015 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
2007EN 61557-8:2007 Electrical Safety in Low Voltage Distribution Systems up to 1 kV a.c. and 1@5 kV d.c. - Equipment for Testing@ Measuring or Monitoring of Protective Measures; Part 8: Insulation Monitoring Devices for IT Systems
1997EN 61557-8:1997 Electrical Safety in Low Voltage Distribution Systems up to 1 kV a.c. and 1@5 kV d.c. - Equipment for Testing@ Measuring or Monitoring of Protective Measures; Part 8: Insulation Monitoring Devices for IT Systems