Electricity Rules, 2050 (1993)
Rule 40
Supply Voltage
– (1) The standard of supply voltage shall have to be  maintained as follows:-
(a) 230 volt in A.C. single phase and 400 volt in three   phases for general consumers.
(b) For those who want a supply of electricity from four  wires, the electric service shall be made a vailable in
230/400 volt from A.C. three phases.
(2) The fluctuation shall not be allowed for more than five percent  in standard volt as mentioned in Clauses (a) and (b) of sub-rule (1).
Electricity Rules, 2050 (1993)
Chapter - 2
Rule 3: Information To Be ProvidedRule 4: Application To Be Submitted To Obtain A License To Conduct A Survey Of Production Of ElectricityRule 5: Application To Be Submitted To Obtain A License To Conduct A Survey Of Transmission Of ElectricityRule 6: Application To Be Submitted To Obtain A License To Conduct A Survey Of Distribution Of ElectricityRule 7: Examination Of ApplicationRule 8: To Issue License For SurveyRule 9: To Issue A License For Survey At The Same TimeRule 10: Survey Report To Be SubmittedRule 11: License For Survey Not To Be Issued In DuplicityRule 12: Application To Be Submitted To Obtain A License For Production Of ElectricityRule 13: Application To Be Submitted To Obtain A License For Transmission Of ElectricityRule 14: Application To Be Submitted To Obtain A License For Distribution Of ElectricityRule 15: Examination Of ApplicationRule 16: Public Notice To Be PublishedRule 17: To Issue A LicenseRule 18: License Might Be I Ssued For Production, Transmission And Distribution Of Electricity At The Same TimeRule 19: License To Be Given For Production Transmission And Distribution To The Licensee Of SurveyRule 20: Right On Water ResourcesRule 21: Time Limit To Start The WorkRule 22: New License To Be ObtainedRule 23: Permission For Import Of ElectricityRule 24: License FeeRule 25: To Renew The LicenseRule 26: Counting Of Unit (kilowatt Hour) For The Purpose Of RoyaltyRule 27: Export Tax
Chapter - 5
Rule 48: Minimum Distance From Ground To The Electric WireRule 49: Regarding The Installation Of Electric Line Across The RoadRule 50: Distance To Be Maintained On Either Side Of The Electric LineRule 51: Distance To Be Maintained In Between The PolesRule 52: No Electric Lines Should Be Carried Out From Above A HouseRule 53: In Relation To Installation Of The Lines Of Different Voltages In A Single PoleRule 54: In Relation To Electric Lines To Be Installed Around AirportRule 55: In Relation To Installation Of Electric Lines And Telephone LinesRule 56: Safety From LightningRule 57: Change-over-switch To Be MaintainedRule 58: Earthing To Be DoneRule 59: Cutout To Be InstalledRule 60: Earthing Of Electric Devices To Be Used At The Places Of The ConsumerRule 61: Safety Of Internal WiringRule 62: Insulated Wire To Be UsedRule 63: Electric Line To Be Provided Through PoleRule 64: Danger Of Leakage At 230/400 VoltRule 65: Danger Of Leakage At High VoltageRule 66: Utilization Of House And Land Around The Construction Site Relating To Production, Transmission And Distribution Of Electricity May Be ProhibitedRule 67: Standard Of Electrical Devices And Method Of Use