Here lies the answer,because of the index based market wide circuit breaker system implemented by both exchanges pursuant to SEBI circular, which is placed for our bloggers perusal-:
SEBI circular SMDRPD/Policy/ Cir-37/2001 dated June 28, 2001
The index based market wide circuit breaker system
The system is applicable at three stages of the index movement either way at 10 per cent, 15 per cent and 20 per cent. This circuit breaker brings about a coordinated trading halt in all equity and equity derivative markets nationwide.
This is in addition to the price band imposed for individual stocks by the Exchanges.
The market wide circuit breakers would be triggered by movement of either Sensex or the NSE S&P CNX Nifty whichever is breached earlier.
In case of a 10 per cent movement of either of these indices, there would be a 1-hour market halt if the movement takes place before 1 p.m. In case the movement takes place at or after 1 p.m. but before 2.30 p.m. there will be a trading halt for ½ hour. In case the movement takes place at or after 2.30 p.m. there will be no trading halt at the 10 per cent level and the market will continue trading.
In case of a 15 per cent movement of either index, there will be a 2-hour market halt if the movement takes place before 1 p.m. If the 15 per cent trigger is reached on or after 1 p.m. but before 2 p.m., there will be a 1-hour halt. If the 15 per cent trigger is reached on or after 2 p.m. the trading will halt for the remainder of the day.
In case of a 20 per cent movement of the index, the trading will be halted for the remainder of the day.
These percentages are translated into absolute points of index variations on a quarterly basis. At the end of each quarter, these absolute points of index variations are revised for the applicability for the next quarter. The absolute points are calculated based on closing level of index on the last day of the trading in a quarter and rounded off to the nearest 10 points in case of S&P CNX Nifty.
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