OVE/ONORM EN 61557-9:2015现行
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 9: Equipment For Insulation Fault Location In It Systems (Iec 61557-9:2014)
出版：Osterreichisches Normungsinstitut
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