Indian equity benchmarks are likely to make a flat start on Wednesday tracking mild gains in most other Asian markets, as investors turned caotious ahead of the outcome of the Federal Reserve's policy meeting. At 8:18 am, Nifty futures trading on Singapore Exchange -- an early indicator of the Nifty50 index -- were down 15.5 points or 0.1 percent at 17,317.5, suggesting a weak start ahead on Dalal Street.