Before revision: IEC Definition Voltage range AC RMS voltage (V) DC voltage (V) Defining risk High voltage (HV) > 1000IEC 61140:2016 Chapter 4.2 > 1500 Electrical arcing Low voltage (LV) ≤ 1000 ≤ 1500 Electrical shock Extra Low voltage (ELV) ≤ 50 ≤ 120 Low risk May depend on the applicable standard used.
After revision: IEC Definition Voltage range AC RMS voltage (V) DC voltage (V) Defining risk High voltage (HV) > 1000IEC 61140:2016 Chapter 4.2 > 1500 Electrical arcing Low voltage (LV) ≤ 1000 ≤ 1500 Electrical shock Extra Low voltage (ELV) ≤ 50 ≤ 120 Electrical fire May depend on the applicable standard used.