EHV, HV & MV Installations

Definition of Voltage Class (See Rule 2(1)(av) & Rule 54 of Indian Electricity Rules,1956)

S.No. Voltage Class Abbreviation Max. Voltage under Normal Conditions Variations Allowed
1 Low LV 250 V -6% to +6%
2 Medium MV 650 V -6% to +6%
3 High HV 33,000 V -9% to + 6%
4 Extra High EHV > 33,000 V 12.5% to + 10%

EHV & HV Installations

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