Niederspannung
The International Electrotechnical Commission Standard IEC 61140:2016 defines Low voltage as 0 to 1000 V a.c. rms or 0 to 1500 V d.c. Other standards such as IEC 60038 defines "supply system low voltage" as voltage in the range 50 to 1000 V ac or 120 to 1500 V dc in "IEC Standard Voltages" which defines power distribution system voltages around the world. Since the definition may vary between standards, always refer to the definition provided in the document being used.