(a)If the shaft exceeds 45 metres in depth, there shall be provided for each bucket or other means of conveyance a detaching-hook between the centre of the hole for attaching the detaching-hook to the rope shackle and the detaching bell or plate and when the bucket or other means of Conveyance is at the top landing, there shall be a clear over-run space of not less than 3.6 metres.
