Specifies requirements for insulation monitoring devices which permanently monitor the insulation resistance to earth of unearthed IT a.c. and d.c. systems, and for IT a.c. systems with galvanically connected d.c. circuits.
IEC 61557-8 Ed. 1.0 b:1997 History
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IEC 61557-8 Ed. 1.0 b:1997
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