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IEC 61557-8-2007
Electrical safety in low voltage distribution systems up to 1000V a.c. and 1500V d.c. Equipment for testing,measuring or monitoring of protective measures. Part 8:Insulation monitoring devices for IT systems
适用范围：This part of IEC61557 specifies the requirements for insulation monitoring devices (IMD) which permanently monitor the insulation resistance to earth of unearthed IT a.c. systems, for IT a.c. systems with galvanically connected d.c. circuits having nominal voltages up to 1000V a.c., as well as of unearthed IT d.c. systems with voltages up to 1 500V d.c. independent from the method of measuring.NOTE 1"IT systems are described in IEC 60364-4-41 amongst other literature. Additional data for a selection of devices in other standards should be noted.NOTE 2"Various standards specify the use of insulation monitoring devices in IT systems. In such cases, the objective of the equipment is to signal a drop in insulation resistance below a minimum limit.NOTE 3--Insulation monitoring devices according to this part of IEC61557 may also be used for de-energized electrical systems.
发布日期： 2007-01-29
实施日期： 2007-01-29
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