MSHA - Code of Federal Regulations - 30 CFR 57.15031
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MSHA - Title 30 CFR
Location of self-rescue devices.
(a) Except as provided in paragraph (b) and (c) of this section, self-rescue devices meeting the requirements of standard 57.15030 shall be worn or carried by all persons underground.
(b) Where the wearing or carrying of self-rescue devices meeting the requirements of standard 57.15030 is hazardous to a person, such self-rescue devices shall be located at a distance no greater than 25 feet from such person.
(c) Where a person works on or around mobile equipment, self-rescue devices may be placed in a readily accessible location on such equipment.