Before revision: The International Electrotechnical Commission (IEC) 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 VoltagesIEC Standard Voltages, IEC 60038 which defines power distribution system voltages around the world.
After revision: The International Electrotechnical Commission (IEC) Standard IEC 61140:2016 defines Low voltage as 0 to 1000 V AC RMS or 0 to 1500 V DC 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 VoltagesIEC Standard Voltages, IEC 60038 which defines power distribution system voltages around the world.