专家解读视频
Defines requirements for insulation monitoring devices for permanent monitoring of the insulation resistance to earth of unearthed IT a.c. systems, for IT a.c., in addition to unearthed d.c. systems having voltages up to 1500 V d.c. independent from measuring method.
I.S. EN 61557-8:2007 - Identical
NF EN 61557-8:2007 - Identical
SN EN 61557-8:1997 - Identical
BS EN 61557-8:2007 - Identical
DIN EN 61557-8 (2007-12) - Identical
SS EN 61557-8 Ed. 1 (1998) - Identical
UNE EN 61557-8:1998 - Identical
