All voltages shall be selected are as per IEC-60038

So I guess the LV MV HV and EHV shall be followed as per IEC.

Declared Voltage For The State Of Qatar :
Rated Voltage : 240 / 415 ± 6 %, 3 Phase, 4 Wire.
Neutral : Solidly Earthed.
Fault Level : 31 MVA At 415 V.