Section 31A(1) in Tamil Nadu Transparency In Tenders Rules, 2000
(1)In cases where the prices offered by the Lowest Tenderer are in the opinion of the Tender Accepting Authority higher than the schedule of rates or the prevailing market price and the quantity of goods or services to be procured are of such volume or are required to be delivered at different locations or at different points in time such that it is not practical for the entire supply to be effected by only one or a few suppliers, such authority may for reasons to be recorded in writing and after obtaining the prior approval of Government, follow the fixed rate contract procedure.