Thirty Minute Waiting Period Before Returning to Misfired Hole

Section 628. Thirty Minute Waiting Period Before Returning to Misfired Hole.--Where misfires occur with electric detonators, a waiting period of at least thirty minutes shall elapse before anyone returns to the misfired hole or holes. Before returning to the misfire, the blasting wires shall be disconnected from the blasting battery and the ends of the blasting wires short-circuited.