IEC 61557-1-2019 pdf download

IEC 61557-1-2019 pdf download.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 1: General requirements. 4.3 Rated operating conditions The following rated operating conditions shall apply, except for insulation monitoring...