Diesel Generator Installation Guideline

DIESEL GENERATOR INSTALLATION GUIDELINE

August 10, 2023 1 Comment

Guideline for Generator (Government of Kerala-Department of Electrical Inspectorate)

SR. NO Capacity of Generator Category 1 Up to 10KVA Portable Generator 2 10KVA to 100KVA Small Generators 3 100KVA to 1000KVA Medium Generators 4 Above 1000KVA Large Generators

Guideline for Portable Generator (Government of Kerala-Department of Electrical Inspectorate)

Size Generators up to 10kVA rating shall be treated as portable generators ELCB Size ELCB having an operating time of 20ms at a residual current of 30mA shall be provided. Neutral For 1phase generators one terminal shall be connected to earth and designated as the neutral. 3phase generators shall have their windings connected in star, with the star connection made available and connected to earth. Single Phase DG use for Three Phase Supply The supply from a single-phase generator shall be feed to a three-phase supply system through a 4-pole change over switch subject to the following conditions: (a) The neutral conductors of the load side and generator side shall be of adequate capacity to carry the total current in the neutral. (b) The 3 poles in the 4 pole change over switch shall be linked by using rigid conductors of adequate short circuit and continuous current rating capacity Location Portable generators shall be kept at a place, sufficiently ventilated so as to avoid possible hazards due to the accumulation of smoke and pollution.

Guideline for Medium Voltage Generator (Government of Kerala-Department of Electrical Inspectorate)

APPROVAL FROM ELECTRICAL INSPECTOR NOT Required: For generators of 10kVA to 30kVA rating completion report and SLD shall be submitted with a certification by the owner and the contractor stating that the electrical installation work is carried out by using change over switch, cable, MCB, etc. of standard make and with ISI mark for issuing the sanction for energization. Required: For generators above 30kVA prior scheme approval shall be obtained Meters Watt-hour meter and ammeters in each phase shall also be provided in GCP. For generators of 500 kVA and above, kVA/KW meter and P.F. meter shall also be provided Exhaust Pipe Exhaust pipe of DG sets shall maintain a minimum height of 1.8 m clearance from floor level and shall be extended to a height of at least 1m above the building. Clearance Minimum 1m clearances shall be provided on three sides of a generator set. When two generator sets are installed side-by-side, minimum 2.0 m clearance shall be provided between them Location The generator sets should not be allowed to be installed above the ground floor or below first basement level of the building. There shall be provision of separate direct escape and entry into these areas from outside in case of fire. Generators Running in Parallel Double frequency meter and double voltmeter, P.F Meter shall be provided in synchronizing panel / Control Panel. For generators of 1MVA and above synchro check relay , kVA and kVAr meters, Reverse Reactive Power relays shall provide in synchronizing panel / Control Panel. Neutral switching facility shall be provided. Interlock shall be provided to ensure that the generator breaker cannot be closed unless one of the neutral is connected to the earthing system Neutral of largest capacity generator shall only be earthed. Neutrals of other generators, running in parallel, shall be in floating condition. Also ensure that generator breakers can be made ‘ON’ only if functional neutral is earthed and closed.

Guideline for Change Over Switch of Portable Generator (Government of Kerala-Department of Electrical Inspectorate)

Capacity of single-Phase Generator Change over switch rating Minimum copper area of conductors used for linking the poles Up to 3 kVA 32 A 20 sq.mm 3 to 6 kVA 63 A 40 sq.mm 6 to 10 kVA 100A 60 sq.mm

Electricity Act, 2003 (Central Act No. 36 of 2003) & Central Electricity Authority Regulations, regulation 32, 2010

Inspection of D.G by Electrical Inspector All the apparatus of capacity above 100 KVA of the generating units including generating units producing electricity from renewable sources of energy shall be inspected by the Electrical Inspector before commissioning.

General Development Control Regulations, Gujarat – 2017

No construction shall be permissible in the Common Plot except Electric substation, Transformer room, Auxiliary power generator, Box-type transformer, section feeder pillar, meter room, over and underground water tank and pump room, security cabin, Community/ Society common amenities shall be allowed to be constructed in the Common Plot subject 22.14 Emergency Power Supply for Buildings height more than 45Meter and Special Buildings 1 For every building having height more than 45mts, a stand‐by electric generator shall be installed to supply power to staircase and corridor lighting circ…