Section 39(10)(b) in Tamil Nadu Combined Development and Building Rules, 2019
(b)Every High Rise Building erected shall be provided with(i)lifts as prescribed in National Building Code of India, 2016;(ii)a stand-by electric generator of adequate capacity for running lift and water pump, and a room to accommodate the generator;(iii)an electrical room confirming to the rule 44.(iv)at least one meter room of size 2.4 meters by 2.4 meters for every 10 consumers or 3 floor whichever is less. The meter room shall be provided in the ground floor.