Voltage Levels – IEC 61000-3-6

The following table provides the different voltage levels as per IEC. It is good to note that [1] is the only IEC standard that mentions about Medium voltage. All other IEC standards consider voltages above 1kV to be high voltage.

IEC Voltage Levels[1]
Voltage Level Range (line-to-line)
LV (Low voltage) Un ≤ 1kV
MV (Medium voltage) 1kV < Un ≤ 35kV
HV (High voltage) 35kV < Un ≤ 230kV
EHV (Extra high voltage) Un < 230kV

NOTE The boundaries between the various voltage levels may be different for different countries


  1. IEC/TR 61000-3-6
    Electromagnetic compatibility (EMC) –
    Part 3-6: Limits – Assessment of emission limits for the connection of distorting
    installations to MV, HV and EHV power systems

A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia and Professional Electrical Engineer (PEE) - Philippines with extensive experience in concept select, front-end engineering, HV & LV detail design, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and waste water pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).