Voltage Ranges Based on IEC 60038 Low Voltage (LV): 100 V - 1,000 V → Homes, offices, small industries Medium Voltage (MV): 1 kV - 35 kV → Distribution networks, factories High Voltage (HV): 36 kV - 230 kV → Regional transmissionVoltage Ranges Based on IEC 60038 Low Voltage (LV): 100 V - 1,000 V → Homes, offices, small industries Medium Voltage (MV): 1 kV - 35 kV → Distribution networks, factories High Voltage (HV): 36 kV - 230 kV → Regional transmissionVoltage Ranges Based on IEC 60038 Low Voltage (LV): 100 V - 1,000 V → Homes, offices, small industries Medium Voltage (MV): 1 kV - 35 kV → Distribution networks, factories High Voltage (HV): 36 kV - 230 kV → Regional transmission Extra High Voltage (EHV): 245 kV → 800 kV → National grids and. This manual is provided for the use of all Departments of the ITER Organization and is addressed to system specifiers, designers and users of electrical components in otherwise non-electrical plant systems. This is an initial version of this document that has been reviewed in accordance with the. The IEC Standards for High Voltage Equipment Testing provide a benchmark for manufacturers, utilities, and testing laboratories around the world. This article explores these standards in detail. The primary purpose of IEC 60038 is to provide a common reference point for nominal system voltages.