Section 132(2) in Kolkata Municipal Corporation Building Rules, 2009
(2)In respect of any building having total floor area of 20,000 sq. m. or more and used for commercial purpose and where the connected load is expected to be 500 KW or more, a certified Energy Auditor should approve the electrical power distribution plan of the building. For erection and commissioning job of the electrical plants and equipments of such buildings, a certified Energy Auditor should supervise the job and will have to finally give "Completion Certificate of Electrical Works" on satisfactory completion of the work.