Section 81(10)(a) in The Coal Mines Regulations, 2017
(a)In every shaft, there shall be provided an effective automatic contrivance to prevent overspeeding and overwinding, hereinafter called the 'Automatic Contrivance", which shall prevent the descending cage from being landedat the pit bottom or other permanent landing at a speed exceeding 1.5 meters per second and also control the movement of the ascending cage in such a manner as to prevent danger to persons riding therein.