EN 61557-9:2009 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 9: Equipment for insulation fault location in IT systems
2015EN 61557-9:2015 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 9: Equipment for insulation fault location in IT systems
2009EN 61557-9:2009 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 9: Equipment for insulation fault location in IT systems
1999EN 61557-9:1999 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 9: Equipment for Insulation Fault Location in IT Systems