Section 6(5)(c) in Tamil Nadu Electricity Regulatory Commission Tamil Nadu Electricity Distribution Code
(c)While planning the distribution system, the Licensee shall examine the cost effectiveness of loss reduction measures without compromising the security standards. The Licensee shall take measures to reduce the length of low tension bare conductor, overhead lines, wherever cost effective and these shall include but not limited to the following:(i)Achievement of HT: LT ratio to the level of 1 to 1.5(ii)Laying of underground cables(iii)Increasing the number of low loss distribution transformers.