27-347. Construction of ladder-ways
A. Permanent ladder-ways shall be strong and firmly fastened, and shall be kept in good repair.
B. In a vertical shaft the inspector may, in his discretion, by an order in writing, direct that the ladder be inclined at the most convenient angle which the space where the ladder is fixed allows, and every ladder shall have substantial platforms at intervals of not more than twenty feet. The platform shall be closely covered, with exception of an opening large enough to permit the passage of a human, and shall be arranged so that a person cannot fall from one ladder through the opening to the next ladder.
C. Ladder-ways shall be provided in shafts in the course of sinking them to within a distance from the bottom as will secure them from damage by blasting. From the end of the ladder-ways, portable ladders shall be extended to the bottom of the shaft.