30 CFR § 75.214 Supplemental support materials, equipment and tools.
(a) A supply of supplementary roof support materials and the tools
and equipment necessary to install the materials shall be available at a
readily accessible location on each working section or within four crosscuts
of each working section.
(b) The quantity of support materials and tools and equipment
maintained available in accordance with this section shall be sufficient to
support the roof if adverse roof conditions are encountered, or in the event
of an accident involving a fall.