30 CFR 57.19111 - Shaft-sinking ladders.
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Substantial fixed ladders shall be provided from the collar to as near the shaft bottom as practical during shaft-sinking operations, or an escape hoist powered by an emergency power source shall be provided. When persons are on the shaft bottom, a chain ladder, wire rope ladder, or other extension ladders shall be used from the fixed ladder or lower limit of the escape hoist to the shaft bottom.
Title 30 published on 2013-07-01
no entries appear in the Federal Register after this date.