Reasons for Shorting and Setup:
1) Continuous selling pressure from June with good selling volumes at 2 previous supports.
2) Making some Lower Highs from June.
3) Trading below 50, 100 and 200 EMAs
Entry: Can enter around 149.00 to 149.50 after the breakdown of major support with good volumes. Entry level was kept bit lower to the support for a buffer.
Stop loss: Can keep SL at 154.00 which will be previous resistance once breakdown happens. Can trail SL above cost accordingly only if downtrend continues after the first target achieved. Else can exit.
Target: First target at 142.50 which is a support. IF selling continues the can see 135.00 to 133.00 levels.
RR Ratio: 1.3 (Entry - 149.50, SL - 154.00, Target - 142.50)
Note: Just keep an eye on NIFTY although it doesn't necessarily follows it.