BS EN 61557-8:2015(2016) Electrical safety in low voltage distribution systems up to 1000 V A.C. and 1500 V D.C. — Equipment for testing, measuring or monitoring of protective measures Part 8 : Insulation monitoring devices for IT systems
2015BS EN 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. Insulation monitoring devices for IT systems
2007BS EN 61557-8:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures - Insulation monitoring devices for IT systems