Section 41(1)(e) in The Bangalore Metro Railway (Opening of Public Carriage for Passengers) Rules, 2011
(e)energization of electrical equipments and third rail system shall be progressively undertaken starting with High Tension equipments at the receiving sub-stations, 33 KV feeders from the receiving sub-stations to the traction and auxiliary sub-stations and 750V DC feeders from the traction sub-station to the third rail followed by one sub-sector after another; and